taxonID	type	description	language	source
03C48794FFB6BC2D0E65FE95FBF6FADB.taxon	diagnosis	DIAGNOSIS: Species of Diadasina are characterized by their short mouthparts, the pale pubescence on the head and mesosoma, and the distinct apical bands of yellow hairs on the metasoma (on T 2 – T 4 in the female or T 2 – T 6 in the male). The distinctly yellow-banded metasoma distinguishes Diadasina from species of Alepidosceles Moure and sympatric species of Diadasia Patton, two other emphorine genera with short mouthparts (species of Diadasia with banded terga occur in other areas). Besides their smaller size, they are readily separated from Ptilothrix by the presence of arolia (absent in Ptilothrix), and the short first flagellomere (as long as its apical width, twice as long in Ptilothrix). They may be confused with species of Leptometriella, which may have similar size and pubescence pattern. Both sexes of Diadasina are distinguished by the labrum with a rounded preapical margin, which is not carinate and without denticles (as is the case in Leptometriella), by the metapostnotum entirely covered with hairs (in species of Leptometriella an upper bare area bordering the metanotum is always present), and by the female hind basitarsus being blunt apically, not with the strong apical projection present in females of Leptometriella. CHARACTERIZATION OF DIADASINA: 5.5 – 9.0 mm long, with distinct apical bands of hairs on T 2 – T 4 (female) or T 2 – T 6 (male). First flagellomere short, as long as its apical width. Labrum of both sexes with the preapical margin rounded, not carinate and without denticles. Mandible of female with small preapical tooth. Proboscis short, at rest barely reaching anterior coxae; second segment of labial palp at most 0.8 times as long as first, much shorter than eye length (0.30 – 0.35 ˟). Metapostnotum entirely covered with hairs, at most with a very narrow longitudinal bare band. Hind tibia of female with distinct basitibial plate. Hind basitarsus of female with the apical projection blunt and weak. Arolia present; all claws with pointed apices in both sexes. Gradulus of S 2 gently curved. Gradulus of T 6 of female incomplete, absent at sides of pygidial plate, present as short lateral apical portion. Pygidial plate funnel-shaped, with basal sides straight, and apical portion narrow, parallel-sided. S 6 of male with hairs longer along midline, frequently forming a tuft. S 7 with simple, hairy apical lobes; S 8 with apical portion profoundly divided by longitudinal slit; gonostylus shorter than gonocoxite (0.75 ˟); dorsoapical lobe of gonocoxite shorter than gonostylus (0.4 ˟), hairy.	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB2BC240D8EFBCEFD03FD17.taxon	description	(Figs. 1, 3, 5, 7, 13, 15, 23)	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB2BC240D8EFBCEFD03FD17.taxon	diagnosis	DIAGNOSIS: This widespread species is readily distinguished by the fulvous color of the pile on the vertex and the dorsum of the thorax, more conspicuous in females than in males. Both sexes have a distinctive distal segment on the labial and maxillary palpi, with a broadened, bifid apex (Fig. 5). The scutum has sparser punctures than in the other species of the genus. Males are readily distinguished by the loose pilosity of S 6, not forming a dense tuft as in the other species, and by the crenulate antenna.	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB2BC240D8EFBCEFD03FD17.taxon	description	REDESCRIPTION: Female. Length, 7.0 – 8.5 mm; length of forewing 5.8 – 7.0 mm. Black, with yellowish brown distitarsi and tegula, and yellowish tibial spurs; but some specimens with all tarsi yellowish brown to yellowish, and antenna with reddish last flagellomeres. Pubescence rufous on vertex and dorsum of mesosoma; greyish on rest of head and mesosoma, on proximal part of legs, and base of T 1; brown to dark brown on dorsal surface of fore and mid tibiae; black along upper margin of hind tibia apical of basitibial plate; yellowish brown to bright orange brown on hind tibia, tarsi, and metasomal sterna. Pubescence brown to yellowish brown on basal part of T 2, black on basal part of T 3 – T 4; prepygidial and pygidial fimbriae black; basal part of T 5 with appressed white hairs; apical bands on T 1 – T 4 yellow. Hairs on scutum 0.8 – 1.4 ˟ MOD; on mesopleuron 1.7 – 2.2 ˟ MOD. Hairs on outer side of forebasitarsus simple. Scopa on hind tibia and basitarsus sparse, with long, stiff, simple hairs and shorter plumose hairs with few, long branches. T 1 – T 4 with sharply defined apical bands, that on T 3 along midline 1.3 – 1.8 ˟ MOD. Scutum with sparse punctures, separated by polished interspaces 1 – 3 ˟ puncture diameter. Eyes weakly convergent below, proportion of upper to lower interocular distance, 1: 1.05 – 1.10. Vertex moderately elevated behind ocelli, distance from median ocellus to vertex in frontal view 1.07 – 1.10 ˟ MOD. Last segment of labial and maxillary palpi with truncate, bifid apex. Male. Length, 6.5 – 8.5 mm; length of forewing 5.7 – 6.8 mm. Color of integument similar to that of female, but hind and mid tibiae sometimes with apical yellowish brown spot on outer surface; in some specimens nearly whole hind tibia and S 6 yellowish brown, and flagellum entirely reddish. Pubescence yellowish brown to greyish, in some specimens paler on venter of body. With well-defined apical bands on T 1 – T 6. S 6 with sparse hairs, longer on apical third and on median longitudinal elevation, shorter at sides of longitudinal elevation. Vertex moderately elevated behind ocelli, distance from median ocellus to vertex in frontal view 1.0 – 1.2 ˟ MOD. Flagellum crenulate, proportion of four proximal flagellomeres 1: 1: 1.2: 1.2; first and second flagellomeres as long as their apical width, following two flagellomeres longer than their apical width (1.2 ˟).	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB2BC240D8EFBCEFD03FD17.taxon	discussion	COMMENTS ON TYPE MATERIAL: A single syntype specimen of Teleutemnesta distincta from the Holmberg collection is preserved in Buenos Aires at MACN. It is a female lacking the head and part of the metasoma beyond T 2. It bears the following labels: a white minute triangle with a date “ II / 26 ”, a rectangular label with the number “ 29. ” and a label in Holmberg’s handwriting “ distincta / Holmberg. ” The date coincides with the date indicated for the specimen mentioned in the original description as collected in Buenos Aires, Las Conchas (nowadays locality of Tigre). The number 29 coincides with the number of the microscopic slide of the mouthparts indicated by Holmberg in the original description. The specimen is here designated as the lectotype and labeled accordingly. The syntype specimens from Córdoba and Paraguay can be considered lost. The lectotype agrees in every detail with the current concept of the species. The syntypes of Ancyloscelis analis Vachal preserved in Paris are two females mounted together on a single pin. The locality label, a white rectangle written with red ink, only reads “ Argentin. ” Both specimens are conspecific and agree with D. distincta (Holmberg). Strand (1910) based his species Ptilothrix adolphi on several specimens, all of which agree with D. distincta. A male with the following labels is designated here as the lectotype: “ Asuncion / Paraguay / Sapucay / 12. I. 05 / J. D. Anisits, ” “ Ptilothrix / adolphi / [male symbol] m. / Strand det., ” “ Co- / Type, ” and a lectotype label of mine. A female with similar labels is designated as paralectotype. When I requested type material of Ancyloscelis duckei Friese, 1910 from Berlin (ZMB), it was not located. I have studied several specimens that may represent syntypes, since Friese may have sent them back to A. Ducke: two specimens identified by Friese himself as Ptilothrix duckei (at SEMC), specimens identified by Ducke as Ancyloscelis duckei (Museu Paraense Emilio Goeldi and SEMC), and the specimen invalidly designated as lectotype of Melitoma paraensis Ducke by Nascimento (1979) at the Museu Goeldi. All these specimens are from Pará and were collected by Ducke before 1910. It is not clear whether Friese actually based his species on any of these specimens, and their type status is not certain. However, the pattern of pubescence of the female and the crenulate antenna of the male, both described by Friese (1910), leave no doubts about the identity of the species. The male holotype of Diadasia paraensis monticola Moure corresponds to a male of D. distincta (Holmberg). The color differences mentioned by Moure (1944), i. e., the black antennae and legs, fall within the limits of variability of the species. Males with reddish flagellum and extensively reddish legs as well as males with dark antennae and legs occur frequently in the same populations, without a geographic correlation.	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB2BC240D8EFBCEFD03FD17.taxon	distribution	DISTRIBUTION: Argentina, provinces of Buenos Aires, Chaco, Córdoba, Corrientes, Entre Ríos, Formosa, Jujuy, Misiones, Río Negro, Salta, Santa Fe, Santiago del Estero, and Tucumán. Brazil, states of Alagoas, Amazonas, Bahia, Espírito Santo, Maranhão, Mato Grosso, Minas Gerais, Pará, Paraíba, Paraná, Rio Grande do Sul, and São Paulo. Paraguay, departments of Alto Paraná, Asunción, Concepción, Cordillera, Itapuá, Presidente Hayes, and San Pedro. Uruguay, department of Treinta y Tres.	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB2BC240D8EFBCEFD03FD17.taxon	materials_examined	MATERIAL STUDIED: Argentina. Buenos Aires: 2 F, Otamendi, ii. 1993, P. Hazeldine (MACN); 12 F, Otamendi, 1. ii. 1990, L. Moffatt (MACN); 1 F, Sierra de la Ventana, 1. ii. 1989 (MACN); 20 F, 5 M, Buenos Aires, ii. 1898, xii. 1903, xii. 1907, ii. 1908, 10. xii. 1915, J. Brèthes (MACN); 10 F, 9 M, La Plata (MACN); 5 M, Capital Federal, Reserva Costanera Sur, 6. xi. 2015, 1. xii. 2015, 25. i. 2016, Compagnucci, Galvani, González Vaquero (MACN); 2 M, Canal San Fernando, xi. 1945, A. O. (MLP); 10 F, 1 M, Dique Luján, 21. i. 1945, A. Martínez (MLP); 3 F, Tigre, 21. ii. 1945 (MLP); 1 F, Punta Lara, 20. i. 1946, A. Martínez (MLP). Chaco: 24 F, 5 M, Fontana, 10 / 19. iv. 2016, A. Schaller (MACN); 1 M, Colonia Benítez, 12. xii. 1948, R. Golbach (IFML); 5 M, Colonia Benítez, 20. xi. 2018, A. Schaller (MACN); 1 F, Barranqueras, 23. iv. 1916, A. Schaller (MACN); 1 F, 1 M, Colonia Elisa, 15. xi. 2017, A. Schaller (MACN); 3 F, 4 M, Resistencia, Parque Caraguatá, 19. xi. 2018, A. Schaller (MACN); 1 M, Colonia Mixta, 4. i. 1917, A. Schaller (MACN); 12 F, 1 M, Dpto. San Marín, La Eduvigis, 5 / 12. i. 2018, A. Schaller (MACN); 2 F, Parque Nacional Chaco, Laguna Carpincho, 27. ii. 2004, L. Compagnucci (MACN); 7 M, Parque Nacional Chaco, 12 / 13. xi. 2007, L. Compagnucci (MACN); 4 M, Roque Sáenz Peña, 1930, Ohnmeiser (MACN). Córdoba: 1 F, San Marcos Sierras, 7. i. 2005, L. Compagnucci (MACN). Corrientes: 1 F, Manantiales, i. 1960, Apóstol (MACN); 1 F, Estación Biológica EBCO, 26. x. 2016, ex Convolvulaceae, A. Schaller (MACN); 2 F, Empedrado, Derqui, 17. i. 2018, A. Ávalos (MACN); 1 F, Corrientes, ciudad, Camping El 15, 18. xii. 2016, A. Ávalos (MACN); 1 F, 1 M, Pellegrini, xii. 1974, Fritz (MACN). Entre Ríos: 5 F, 2 M, Liebig, 17 / 20. xii. 2004, A. Roig A. (MACN); 4 F, 1 M, Tuyuparé, 26. ii. 1911, J. Brèthes (MACN); 2 F, Palmar de Colón, i. 1974, iii. 1978, Fritz (DZUP); 1 F, Parque Nacional El Palmar, 11. iii. 1994, Hazeldine (MACN); 2 M, Gualeguaychú, Haedo Rossi (IFML); 1 F, Pronunciamiento, ii. 1962, F. H. Walz (DZUP); 4 F, 1 M, Pronunciamiento, i. 1961, J. Foerster (DZUP). Formosa: 1 F, 11 M, C. Aquino, 26. x. 2011, Galvani (MACN); 3 F, Tres Marías, Galvani (MACN); 2 M, ciudad Formosa, Reserva Laguna Oca, 26. ix. 2008, G. Galvani (MACN); 1 F, 1 M, Gran Guardia, J. Foerster (MLP); 1 M, Gran Guardia, xi. 1952, J. Foerster (DZUP). Jujuy: 1 M, Yuto, 12. ii. 1945, J. F. (MLP); 7 F, 2 M, Jujuy (MACN). Misiones: 1 F, Misión San Ignacio, xi. 1953, Viana & De Carlo (MACN); 1 M, Posadas, 17. xi. 1945, A. Martínez (MLP). Río Negro: 4 F, 1 M, Lago Pellegrini, 22. i. 1975, Willink, Claps (IFML); 7 F, 2 M, Luis Beltrán, xii. 1991, Fritx (MACN); 7 F, Choele Choel, i. 1991, U. Fritz (MACN). Salta: 1 M, Orán, ii. 1945, A. Martínez (MLP); 1 F, Saucelito, 1. xii. 1952, A. Ogloblin (MLP); 2 M, Tartagal, ii. 1957, Willink (IFML); 3 F, 1 M, Rosario de Lerma, xii. 1992, A. Roig A. & L. Horovitz (MACN). Santa Fe: 1 F, Vera, 25. iii. 1942 (MLP); 1 M, Fontana, 28. iii. 1942 (MLP); 3 M, San Javier, La Brava, 26. x. 2010, J. P. Torretta & C. Cerino (MACN). Santiago del Estero: 1 M, Tapso, 22. iv. 1951, A. Ogloblin (MLP); 1 M, Termas de Río Hondo, Dique Frontal, 16. x. 1971, C. Porter (IFML). Tucumán: 1 M, Tucumán, 9. xii. 1952 (MLP); 1 F, Trancas, Tacanas, 21. xi. 1957, Golbach (DZUP). Brazil. Alagoas: 2 F, São Miguel, xi. 1952, Camargo (MZSP). Amazonas: 1 F, Manaus, x. 1959, C. Elias (DZUP). Bahia: 3 F, 1 M, Jequié, 10. viii. 1964, C. Elias (DZUP); 1 F, Maracás, ix. 1965, F. oliveira (DZUP); 1 F, Cacule, vii. 1961, S. Laroca (DZUP). Espírito Santo: 1 M, Santa Maria, 21. i. 1967, C. & C. T. Elias (DZUP); 5 F, Santa Teresa, 19. iii. 1966, 4. iv. 1966, C. T. & C. Elias (DZUP); 1 F, 1 M, Conc. da Barra, 26. iv. 1968, C. Elias (DZUP); 1 F, Baixo Guandú, 7. vi. 1971, C. Elias (DZUP); 1 F, Colatina, 28. vii. 1964, C. Elias (DZUP); 1 M, São Roque, 5. v. 1966, C. Elias (DZUP); 1 F, Jacaraipe, 18. ii. 1967, C. & C. T. Elias (DZUP); 2 F, Guarapari, ix. 1960, M. Alvarenga (DZUP). Maranhão: 1 F, São Luis, 11. viii. 1953 (DZUP). Mato Grosso: 1 F, Chavantina, vii. 1962, Alvarenga- Oliveira (DZUP). Minas Gerais: 6 F, Passos, 3. xi. 1962, 1 / 7. v. 1963, 9 / 14. xii. 1963, C. Elias (DZUP); 2 F, Araxá, 5. iv. 1965, C. Elias (DZUP). Pará: 1 M, Santarém, Fazenda Taperinha, ii. 1968 (MZSP); 12 F, 3 M, Belem, 28. v. 1956, E. Lobato (DZUP); 2 F, 2 M, Conceição Araguaia, vii. 1959, M. Alvarenga (DZUP). Paraíba: 3 F, Juazeirinho, 3. xi. 1955, A. Silva (DZUP). Paraná: 2 F, Jacarezinho, 13. ii. 1961, Marston - Laroca (DZUP). Rio Grande do Sul: 2 F, Rosario do Sul, 30. xi. 1985, R. Radtke (DZUP). São Paulo: 1 M, Batatais, 1. i. 1972, J. S. Moure (DZUP); 1 F, Campinas, i. 1962, J. S. Moure (DZUP); 1 F, Cosmopolis, Usina Ester, 9 / 13. ii. 1960, Moure-Hurd-Nogueira (DZUP); 1 F, Rifaina, 20. ix. 1965, C. Elias (DZUP). Paraguay. Alto Paraná: 1 M, Puerto Gral Díaz, iii. 1944 (DZUP). Asunción: 1 M, San Lorenzo, i. 1962, Sakagami & Laroca (DZUP); 2 M, Assunção, 13. i. 1962, Sakagami & Laroca (DZUP). Concepción: 1 M, 12 km S Vallemi, 3. ii. 2007, E. Willis (PCYU). Cordillera: 1 M, 2 km NE Atyra, 18. i. 2007, E. Willis (PCYU). Itapuá: 3 M, Primavera, xii. 1954, W. Brown (DZUP). Presidente Hayes: 1 M, 12 km NW Campo María, 5. ii. 2007, E. Willis (PCYU). San Pedro: 1 F, Carumbe, 28. i / 10. iii. 1965, Golbach (IFML). Uruguay. Treinta y Tres: 6 M, Arroyo Ayala, 18. xi. 1942, C. Carbonell (MLP).	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBFBC230E6FFD09FCC8F95B.taxon	description	(Figs. 2, 9, 12, 14, 17, 24)	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBFBC230E6FFD09FCC8F95B.taxon	diagnosis	DIAGNOSIS: Both sexes of this species are characterized by the short and dense pile that covers the scutum and the metasomal terga, and by the scarcely elevated vertex. The females are further characterized by the bright ferruginous prepygidial and pygidial fimbriae. The males are distinguished by the simple flagellum, not crenulate, reddish on the underside, and with long flagellomeres.	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBFBC230E6FFD09FCC8F95B.taxon	description	REDESCRIPTION: Female. Length, 7.0 – 9.0 mm; length of forewing 6.3 – 7.2 mm. Black, except yellowish brown tarsi, yellowish tibial spurs, and reddish underside of flagellum; tegula varies from yellowish to dark brown in some specimens. Pubescence greyish on head, mesosoma, proximal part of legs, and base of T 1, in some specimens yellowish brown on vertex and dorsum of thorax, yellowish brown to bright orange brown on tibiae, tarsi, metasomal sterna, prepygidial fimbria, and pygidial fimbria, yellowish on basal part of T 2 – T 5; apical bands on T 1 – T 4, yellow. Hairs on scutum dense and short, 0.7 – 1.1 ˟ MOD; on mesopleuron 1.3 – 1.8 ˟ MOD. Hairs on outer side of forebasitarsus bearing numerous short branches; hairs on outer side of hind tibia and basitarsus plumose. Apical band of T 1 laterally formed by long appressed hairs, but medially formed by erect, short and dense hairs; band on T 2 with a similar pattern, but lateral hairs shorter; band on T 3 – T 4 with short and appressed hairs, as most of basal part of these terga, so the basal limit of the band is not apparent in certain views of the metasoma; band on T 3 along midline 1.2 – 1.7 ˟ MOD. Scutum with dense punctures, on disc separated at most by 0.5 ˟ puncture diameter. Eyes convergent below, proportion of upper to lower interocular distance, 1: 1.08 – 1.15. Vertex moderately elevated behind ocelli, distance from median ocellus to vertex in frontal view 0.7 – 0.8 ˟ MOD. Last segment of labial and maxillary palpi with rounded apex. Male. Length, 5.5 – 7.8 mm; length of forewing 5.0 – 6.5 mm. Color and vestiture similar to that of female; hairs on scutum 0.8 – 1.1 ˟ MOD. Apical bands present on T 1 – T 6, that on T 3 along midline 1.2 – 1.4 ˟ MOD. S 6 with dense tuft of hairs on median longitudinal elevation, and bare at sides of it. Vertex of head moderately elevated behind ocelli, distance from median ocellus to vertex in frontal view as long as 0.9 ˟ MOD. Flagellum not crenulate, proportion of four proximal flagellomeres 1: 1.35: 1.35: 1.35; first flagellomere as long as its apical width, following three flagellomeres longer than their apical width (1.15 ˟).	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBFBC230E6FFD09FCC8F95B.taxon	discussion	COMMENTS ON TYPE MATERIAL: Nascimento (1979) failed to indicate the sex of any of the lectotypes designated by him. In the case of Ptilothrix riparia Ducke, the lectotype is a male. The original description of P. riparia was amended by Ducke one year later (Ducke, 1908). He indicated that the prepygidial fimbria of the female was ferruginous and the scopa on the hind tibia and basitarsus of moderate length. The holotype of Diadasia parahybensis Cockerell agrees in all features with the lectotype of D. riparia. The metasoma of the holotype is glued to the locality label.	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBFBC230E6FFD09FCC8F95B.taxon	distribution	DISTRIBUTION: Argentina, provinces of Catamarca, Jujuy, Salta, and Santiago del Estero. Bolivia, department of Santa Cruz. Brazil, states of Bahia, Espírito Santo, Minas Gerais, Pará, Paraíba, Rio Grande do Norte, and Tocantins. Paraguay, departments of Boquerón and Presidente Hayes.	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBFBC230E6FFD09FCC8F95B.taxon	materials_examined	MATERIAL STUDIED: Argentina. Catamarca: 1 F, i. 1929, Bocchio (MACN). Jujuy: 1 F, Jujuy (MACN). Salta: 8 F, 2 M, Sumalao, i. 1993, M. Fritz (MACN); 2 F, 2 M, Coronel Moldes, i. 1989, i. 1993, M. Fritz (MACN); 1 F, Coronel Moldes, 27. i. 1994, F. Trucco Alemán (MACN); 1 F, 3 M, Coronel Moldes, i. 1945, F. Monrós (MLP); 1 M, Coronel Moldes, i. 1945, F. Monrós (IFML); 1 F, Cachi, 21. viii. 1968, Golbach, Terán, Willink (IFML); 1 M, Quijarro, 25. xi. 1951 (MLP); 3 F, 10 M, Tablillas, 15. ii. 1945, A. Martínez (MLP). Santiago del Estero: 1 M, Puerta del Jardín, 20. xi. 1951 (MLP). Bolivia. Santa Cruz: 3 M, Santiago, xi. 1959 (SEMC). Brazil. Bahia: 1 F, Buritirama, Barra, iv. 1959, E. Dente (MZSP); 1 F, Mucuge, 3 km S Igeraes, 7. xii. 1990, S. Amarante (MZSP); 1 M, Maracás, 19. xi. 1965, F. M. Oliveira (DZUP); 1 M, Maracás, 18. viii. 1964, C. Elias (DZUP); 3 F, 5 M, Brumado, 6. v. 1975, C. Elias (DZUP); 1 F, Jeremoabo, 30. i. 2010, F. F. de Oliveira (MACN); 1 F, 2 M, Guanambi, 20 / 23. ii. 2010, F. F. Oliveira (MACN). Espírito Santo: 1 F, 1 M, Santo Antônio, 22. iv. 1966, C. Elias (DZUP); 1 F, 1 M, Santa Leopoldina, Jetibá, 11. iii. 1966, C. Elias (DZUP); 1 F, Dom. Martins, 16 / 28. ii. 1966, C. Elias (DZUP); 1 M, São Domingos, 27. iii. 1966, C. Elias (DZUP); 1 M, Itaguassu, 25. iv. 1970, C. & C. T. Elias (DZUP); 3 F, 3 M, Santa Teresa, 4. iv. 1966, C. T. & C. Elias (DZUP); 3 F, S. J. Petrópolis, 12. ii. 1964, C. Elias (DZUP); 1 F, Baixo Guandú, 25. iv. 1970, C. & C. T. Elias (DZUP); 1 F, Fundão, 20. iv. 1964, C. Elias (DZUP). Minas Gerais: 1 F, 2 M, S. R. Cassia, 11. V. 1961, C. Elias (DZUP); 1 F, Passos, x. 1963, C. T. Elias (MZSP); 6 F, 5 M, Passos, iii. 1961, 15. iii. 1962, 20 / 26. iii. 1963, C. Elias (DZUP); 2 F, 3 M, Delfinópolis, 6. iv. 1963, C. Elias (DZUP); 2 M, Nova Resende, viii. 1961, C. Elias (DZUP); 1 F, Pratápolis, 5. ii. 1963, C. Elias (DZUP); 1 F, Alpinopolis, iii. 1961, C. Elias (DZUP). Pará: 3 F, 12 M, Conceição Araguaia, vii. 1959, M. Alvarenga (SEMC) 1 F, 1 M, Conceição Araguaia, vii. 1959, M. Alvarenga (DZUP). Paraíba: 1 F, 1 M, Santa Luzia, 18. xi. 1955, R. Lima (DZUP); 2 M, Juazeirinho, viii. 1955, A. Silva (DZUP); 2 M, Brandão dos Chandoca, Serra do Brandão, 8. ix. 1955, A. Silva (SEMC). Rio Grande do Norte: 1 M, Serra Negra do Norte, 17. vi. 1995, F. Zanella (SEMC). Tocantins: 1 F, 1 M, Ilha do Bananal, Santa Isabel do Morro, vi. 1961, M. Alvarenga (SEMC). Paraguay. Boquerón: 1 F, 2 M, Fn. Boquerón, 6. ii. 2007, E. Willis (PCYU). Presidente Hayes: 2 F, 1 M, 5 km SW Lag. Capitán, 5 / 6. ii. 2007, E. Willis (PCYU).	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB9BC210D98FF55FF11FE7B.taxon	description	(Figs. 4, 6, 8, 11, 16, 24)	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB9BC210D98FF55FF11FE7B.taxon	diagnosis	DIAGNOSIS. This species is readily distinguished by the strongly elevated vertex in both sexes, and the broad apical yellow bands on T 3 and T 4 of the female. The antenna of the male is not crenulate and has short flagellomeres.	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB9BC210D98FF55FF11FE7B.taxon	description	REDESCRIPTION: Female. Length, 7.5 – 8.5 mm; length of forewing 6.8 – 7.2 mm. Black, except reddish distitarsi (entire hind tarsus in some specimens), and yellowish tibial spurs. Pubescence greyish on head, mesosoma, proximal part of legs, and base of T 1 – T 2, yellowish brown to bright orange brown on tibiae, tarsi, metasomal sterna, prepygidial fimbria, and pygidial fimbria, yellowish on basal part of T 3 – T 5; apical bands on sides of T 1 and on T 2 – T 4, yellow. Hairs on scutum 0.8 – 1.3 ˟ MOD; on mesopleuron 2.2 – 2.7 ˟ MOD. Hairs on outer side of forebasitarsus bearing numerous short branches; hairs on outer side of hind tibia and basitarsus plumose. T 1 at sides and T 2 – T 4 with sharply defined apical band of dense, appressed hairs; bands on T 3 – T 4 very broad, that on T 3 along midline 3 ˟ MOD. Margins of scutum with punctures dense, but median part of posterior half with punctures irregularly distributed, separated by 1 – 5 times their diameter. Eyes weakly convergent below, proportion of upper to lower interocular distance, 1: 1.05 – 1.10. Vertex strongly elevated behind ocelli, distance from median ocellus to vertex in frontal view 1.30 – 1.35 ˟ MOD. Last segment of labial and maxillary palpi with rounded apex. Male. Length, 7.7 – 8.5 mm; length of forewing 5.8 – 6.8 mm. Color and vestiture similar to that of female, although hairs longer, those on scutum 1.3 – 1.9 ˟ MOD. With well-defined apical bands on T 1 – T 6; bands shorter than those of female, that on T 3 along midline 2 ˟ MOD. S 6 with dense tuft of hairs on median longitudinal elevation, and bare at sides of it. Vertex strongly elevated behind ocelli, distance from median ocellus to vertex in frontal view 1.5 – 1.7 ˟ MOD. Flagellum not crenulate, proportion of four proximal flagellomeres 1: 0.9: 0.9: 1; first flagellomere as long as its apical width, following three flagellomeres shorter than their apical width (0.8, 0.8, and 0.9 respectively).	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB9BC210D98FF55FF11FE7B.taxon	discussion	COMMENTS ON TYPE MATERIAL: The male holotype of Leptometria singularis Brèthes bears three labels: “ 212. ” “ Leptometria / singularis Br. ” and “ HOLOTYPE. ” The small number label with a red contour corresponds to the old Burmeister collection. Although Burmeister pinned locality labels on some specimens, many others only have small number labels. Regrettably no record has survived the meaning of these numbers. The metasoma of the holotype is missing, but the non-crenulate antenna with short flagellomeres and the much elevated vertex behind the ocelli readily allows the identification of the species. Cockerell (1918) based his species Diadasia callura on two female specimens from the Bruner collection with the numbers 53 and 51, both with the label “ Carcarana / Argentina ” The female with the number “ 53 ” which bears the labels “ Diadasia / callura / Ckll TYPE ” and “ TypeNo. / 22926 / U. S. N. M. ” is here designated as the lectotype. This specimen is conspecific and agrees in every detail with D. singularis (Brèthes).	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB9BC210D98FF55FF11FE7B.taxon	distribution	DISTRIBUTION: Argentina, provinces of Córdoba, Entre Ríos, Santa Fe, and Santiago del Estero.	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFB9BC210D98FF55FF11FE7B.taxon	materials_examined	MATERIAL STUDIED: Argentina. 1 F, Burmeister collection “ 172. ” (MACN). Córdoba: 1 F, San Marcos Sierras, 24. xii. 2006, A. Roig A. (MACN); 1 F, Capital, 25. xi. 1948, P. López (IFML). Entre Ríos: 1 F, Villaguay, 15. xi (MACN). Santa Fe: 1 F lectotype of Diadasia callura, Carcarañá, “ 53 ” (USNM); 1 M, Carcarañá (SEMC); 1 M, Santo Tomé, November, Stevenin (MACN); 1 M, Alberdi, 24. ii. 1911, J. Hubrich (MACN); 2 F, Vera, 2. xi. 1940, A. Ogloblin (MLP). Santiago del Estero: 2 M, Puerta del Jardín, 29. xi. 1951 (MLP).	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBABC200D9CFD95FCB4FE1B.taxon	description	(Figs. 10, 18 – 22, 23)	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBABC200D9CFD95FCB4FE1B.taxon	diagnosis	DIAGNOSIS: This species is morphologically similar to D. riparia, from which it is distinguished by the longer pile on the mesosoma and the base of T 1. Furthermore, unlike D. riparia, the short hairs on the terga do not conceal the integumental surface, so there is a sharp contrast between the preapical part of the terga and the dense apical yellow bands. The scopal hairs on the tibia and basitarsus, as well as the prepygidial and pygidial fimbriae of the female, are dark brown. The male antenna is entirely black.	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBABC200D9CFD95FCB4FE1B.taxon	description	REDESCRIPTION: Female. Length, 8.5 mm; length of forewing 7.0 mm. Black, except reddish distitarsi; tegula dark brown. Pubescence greyish on head, mesosoma, most of legs, and base of T 1, although somewhat tawny on vertex of head and dorsum of thorax. Scopal hairs on hind tibia and basitarsus, minute hairs on basal part of T 2 – T 5, and hairs of prepygidial and pygidial fimbriae, brown. Apical bands on sides of T 1 and on T 2 – T 4, yellow. Hairs on scutum 1.2 – 1.5 ˟ MOD; on mesopleuron 2.2 – 2.8 ˟ MOD. Hairs on outer side of forebasitarsus bearing numerous short branches; hairs on outer side of hind tibia and basitarsus plumose. T 1 at sides and T 2 – T 4 with sharply defined apical band of dense, appressed hairs; bands on T 3 – T 4 narrow, that on T 3 along midline 1.5 ˟ MOD. Scutum with punctures dense, on disc separated by 0.5 – 1 ˟ puncture diameter. Eyes weakly convergent below, proportion of upper to lower interocular distance, 1: 1.09. Vertex moderately elevated behind ocelli, distance from median ocellus to vertex in frontal view 0.7 ˟ MOD. Last segment of labial and maxillary palpi parallel-sided, with narrowly truncate apex. Male. Length, 7.0 – 7.5 mm; length of forewing 6.0 – 6.5 mm. Color and vestiture similar to that of female, although hairs longer, those on scutum 1.6 – 2.0 ˟ MOD. With well-defined apical bands on T 2 – T 6, that on T 3 along midline 1.5 ˟ MOD. S 6 with dense tuft of hairs on median longitudinal elevation, and bare at sides of it. Vertex moderately elevated behind ocelli, distance from median ocellus to vertex in frontal view 0.9 ˟ MOD. Flagellum not crenulate, proportion of four proximal flagellomeres 1: 1.4: 1.4: 1.4; first flagellomere 0.9 ˟ as long as its apical width, following three flagellomeres longer than their apical width (1.17 ˟).	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBABC200D9CFD95FCB4FE1B.taxon	discussion	COMMENTS ON TYPE MATERIAL: The male holotype is in good condition, although somewhat discolored. It bears the labels: “ Tarija ” “ Leptometria / tarijensis Br. ” and “ Holotypus. ”	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBABC200D9CFD95FCB4FE1B.taxon	distribution	DISTRIBUTION: Bolivia, departments of Cochabamba, Santa Cruz and Tarija.	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
03C48794FFBABC200D9CFD95FCB4FE1B.taxon	materials_examined	MATERIAL STUDIED: Bolivia. Cochabamba: 1 F, 19 M, Cochabamba, R. Zischka (MLP); 1 M, Cochabamba, 15. iv. 1951, Zischka (SEMC). Santa Cruz: 1 M, Estación Experimental General Saavedra, 9. vii. 1972, C. Porter & L. Stange (IFML); 1 M, P. Cordillera, Río Seco, ii. 1959, A. Martínez (DZUP). Tarija: 1 M, Tarija, holotype of Leptometria tarijensis Brèthes (MACN); 2 M, Tarija, 20. iii. 1968, J. Ballard (SEMC).	en	Moure, Neotropical bee genus Diadasina, Hymenoptera, Apidae, Emphorini, Roig-Alsina, Arturo (2025): A revision of the Neotropical bee genus & lt; i & gt; Diadasina & lt; / i & gt; Moure (Hymenoptera: Apidae, Emphorini). Journal of Melittology 2025 (133): 1-18, DOI: 10.17161/jom.vi133.23409, URL: https://doi.org/10.17161/jom.vi133.23409
