Pelecinobaccha adspersa ( Fabricius, 1805 ) Fabricius, 1805

Miranda, Gil Felipe Gonçalves, Marshall, Stephen A. & Skevington, Jeffrey H., 2014, Revision of the genus Pelecinobaccha Shannon, description of Relictanum gen. nov., and redescription of Atylobaccha flukiella (Curran, 1941) (Diptera: Syrphidae), Zootaxa 3819 (1), pp. 1-154 : 17-19

Pelecinobaccha adspersa ( Fabricius, 1805) comb. nov.

Map 6. Figures 10 and 11 .

Baccha adspersa Fabricius, 1805 .— Fabricius, 1805: 200. Type locality: ‘ America meridionali’. Holotype female ZMUC (not examined). Hull, 1943a: 65 (fig. 2, alula); Hull, 1949a: 137 (redescription), 198 (fig. 33, male abdomen).

Ocyptamus adspersus . Thompson et al., 1976: 12 (catalog citation).

Baccha punctata Shannon, 1927 .— Shannon, 1927: 11. Type locality: Bolívia, Beni, San Antonio. Holotype male USNM [synonymised by Fluke (1956)].

Baccha signifera Austen, 1893 .— Austen, 1893: 145. Type locality: Brazil, Amazonas. Holotype Male BMNH (not examined). n. syn.

Ocyptamus signiferus . Thompson et al., 1976: 27 (catalog citation).

Male. Head: Shining bluish black, slightly reddish black on oral margin. Lunule entirely black, slightly lightened above antennal insertion. Frontal triangle black pilose, with pair of median oval spots of silvery-white pollen laterally disconnected from the pollen from the face. Vertical triangle with most black pile forming a central single row ending dorsal to anterior ocellus. Ocellar triangle ~1.5 times its length from posterior eye margin. Eye contiguity slightly longer than vertical triangle length. Eye with posterior indentation slightly ventral to level of antenna insertion. Antennal insertions confluent, ventral margin with short dorsal extension. Dorsal ¼ of occiput with 2 regular rows of simple black pile, anterior row pile short and posterior row pile long, middle 2⁄4 with 1–3 regular anterior rows of simple long black pile and 1 regular posterior row of scale-like and very long white pile; ventral ¼ with 2–3 irregular rows of scale-like white pile, sometimes with sparse simple black pile anteriorly.

Thorax: Prothorax shining black. Scutum shining bluish black, mostly white-pollinose except pollen very sparse or absent laterally; scutum with brown-pollinose pair of sub-median vittae, and white-pollinose median vitta which ends at the posterior ⅔, pollen absent around vittae. Scutum with anterior row of shining white pile interrupted in the middle. Scutellum shining black, black pilose, pile slightly longer than on scutum, sub-scutellar ventral fringe long and black. Pleuron shining bluish black, white-pollinose; pleuron mostly white pilose except black pilose on dorso-posterior of posterior anepisternum (densely arranged), dorsal anterior anepimeron, and with mixed white and black pile on ventral posterior katepisternum, katepimeron with inconspicuous pile. Plumula short, brown. Calypter gray with black margin, short black pile on dorsal lobe and long pale and black pile on ventral lobe. Halter brown to black, capitulum light yellow.

Wing: Mostly hyaline except for dark brown basal ½ (dark on cells bc, c, sc, r, basal ½ of r1, base of r2+3, small basal portion of r4+5, bm, base of dm, base of cua1, and slightly lighter on cu p and anal lobe), entirely microtrichose; alula brown, large, 2 times basally to 3 times apically larger than c cell, entirely microtrichose.

Legs: Proleg brown with pale diffuse areas to entirely dark brown, procoxa bluish-black on basal ⅔, protarsus dark brown. Mesoleg brown with basal pale diffuse areas to entirely dark brown, mesotarsi dark brown; mesocoxa with only 1 row of longer pile antero-apically, bare to sparse pile ventrally on mesotrochanter. Metaleg entirely dark brown; pile distinctly longer on metacoxa, dense and thick black pile ventrally and laterally on metabasitarsomere, less dense on 2nd and mostly pale on the other metatarsomeres; metabasitarsomere thick and long, other metatarsomeres smaller in size.

Abdomen: ~2 times as long as thorax, black; basal membranous region with a large quadrate black sclerotized region connected to 1st tergite. First tergite with long black pile, pile sometimes pale latero-ventrally, sparse pilose to bare medially. Second tergite long, length ~4 times minimum width, and shiny except for triangular dull blackpollinose region subapically; 2nd tergite with a pair of round white maculae subapically inside dull region, and basal ½ with white erect pile laterally but bare dorsally, apical ½ with erect black pile. Third tergite trapezoidal, apex ~1.5 times wider than base, with 4 central white round maculae, one lateral sub-basal pair, and another medial subapical pair; 3rd tergite mostly dull black-pollinose, except shiny apically and laterally, and with appressed black pile. Fourth tergite sub-quadrate, remaining characteristics as on 3rd. Fifth tergite wider than long and similar to 3rd, except entirely shiny. Genitalia: Epandrium notched dorso-posteriorly. Cercus with 2 distinct rows of pile on medial margin, 3 irregular rows of pile on lateral margin. Surstylus sub-triangular with strong setulae well distributed on ventral, concave side, with thin sclerotized layer dorsally, pilose on baso-dorsal ½. Subepandrial sclerite with a pair of posteriorly directed processes. Hypandrium with ventral notch on anterior ½, and notch with rounded posterior margin. Distiphallus with anterior surface sinuous. Postgonite sparsely pilose, with ventral surface straight; postgonite apex convex, with acute ventral and dorsal extremities and a lateral ridge.

Female: Like male except: Vertex mostly bare. Ocellar triangle ~3 times its length from posterior eye margin and ~3 ocelli-width from lateral eye margin. No visible anterior row of pile on scutum. Second abdominal tergite shorter and wider, apical width wider than basal, length ~2.5 times minimum width, baso-lateral ⅔ pale. Third tergite much wider on apex. Fourth tergite rectangular and wide. Sixth segment conical, as long as wide, laterally compressed, slightly shorter than 5th tergite. Genitalia: Strongly sclerotized. Seventh tergite short, basal extensions well sclerotized, wide, long (as long as the 6th segment), curved and flexed dorsally, very short to absent pair of short latero-ventral extensions; 7th segment lateral sclerite narrow, slightly curved and tapering apically; 7th segment with dorso-central area bare. Eighth tergite unsclerotized medially, basal fringe short. Tenth tergite fused basally to cercus. Cerci fused together basodorsally, with 1–2 rows of pile on inner margin.

Length. 8.5–12mm; wing 6.5–8.5mm

Distribution. Bolivia (Beni, La Paz), Brazil (Amazonas, Goiás, Mato Grosso, Santa Catarina, São Paulo), Colombia (Boyaca, Meta), Ecuador (Napo), Guiana, Panama (Canal Zone), Peru (Junín, Lima, Madre de Dios, Ucayali).

Material examined. BOLIVIA. Beni, Rurrenabaque, Mulford BioExpl, Frank M. Hull Collection C.N.C. 1973, 1921–1922, W. M. Mann (1 ♂, CNC Diptera 161292); La Paz, San Juanito, nr. Teoponte, 500m., 15°29'42''S 67°47'48''W, 8 Apr 2001, S. A. Marshall (1 ♀, DEBU 00149667). BRAZIL. Amazonas, Lábrea, Ramal Apaeral Km09, Sítio São Raimundo, ‘Arm. Suspensa 20m’, 07°19'10''S 64°40'07''W, Jun 2006, F. Xavier–Filho (2 ♀, INPA-DT0000263–4); ..., Manaus, Res. Ducke, Igarapé Tinga, ‘Arm. Suspensa 20m 3’, 13–23 Sep 2004, A. Henriques (1 ♂, INPA-DT0000265); ..., Ipixuna, Rio Liberdade, Estirão da Preta, ‘Susp. septo preto’, 07°21'46.7''S 71°52'07.1''W, 11–15 May 2011 (1 ♂, INPA-DT0000266); Goiás, Campinas, “141”, “ Baccha adspersa Fabr. // X.936 Det. H. S. Lopes”, Jan 1936, R. Spitz (1 ♀, MZUSP); Mato Grosso, Faz. Primavera, Rio Paraná, Oct 1954, [E.] Rabello (2 ♂, MZUSP); …, Utiariti, Rio Papagaio, Mt., Oct 1966, [K.] Lenko & Pereira (1 ♂, MZUSP); Santa Catarina, Nova Teutônia, 300–500m, 27°11'S 52°23'W, 1965, 1966 & Oct 1967, F. Plaumann (1 ♂, MZUSP, 3 ♀, CNC Diptera 161299 & MZUSP); São Paulo, Araçatuba, Rio Jacarecatinga, Oct 1961, [J.] Lane & [E.] Rabello (1 ♂, MZUSP); ..., Avanhandava, Feb 1946, M.P. Barretto (1 ♀, MZUSP). COLOMBIA. Boyaca, Muzo, 900m, Frank M. Hull Collection C.N.C. 1973, 1936, J. Bequaert (3 ♂, CNC Diptera 161293 –5); Meta, Restrepo, 500m, Frank M. Hull Collection C.N.C. 1973, 1936, J. Bequaert (3 ♂, CNC Diptera 203475–7). ECUADOR. Napo, Jatun Sacha Biol. Res. 6 km E Misahuali, 1°4'S 70°36'W, ~ 450m, 29 Apr–8 May 2002, several collectors (2 ♂ & 2 ♀, DEBU). GUIANA. Bartica, C. H. Curran Collection Acc. 31144, Frank M. Hull Collection C.N.C. 1981, 30 Jan 1913 (1 ♂, CNC Diptera 161296). PANAMA. Barro Colo[rado Island], F. M. Hull (1 ♂, CNC Diptera 161297); Darien, along road in vicinity of El Real de Santa Maria, 26 May 1977, J. Bird (1 ♂, AMNH). PERU. [Junín], Chanchamayo, Frank M. Hull Collection C.N.C. 1973, 8 Mar [19]48, J. Schunke (1 ♀, CNC Diptera 161300); [Lima], Iquitos, Frank M. Hull Collection C.N.C. 1973, Mar–Apr 1931 R. C. Shannon (1 ♀, CNC Diptera 161301); Madre de Dios, Avispas , 400m., 10–20 Sep 1962, L. Pena (1 ♀, CNC Diptera 161303); [Ucayali], Pucallpa , Frank M. Hull Collection C.N.C. 1973, 4 Dec 1947, J. Schunke (1 ♂, CNC Diptera 161298, 1 ♀, CNC Diptera 161302).

Comments. The holotype wasn’t examined, but this is a readily recognizable species and all studied specimens agree well with the description.

Figures

FIGURE 10. Pelecinobaccha adspersa (Fabricius, 1805), female. a. Cross section of 5 th abdominal segment. b – f. Genitalia: b. Apex, lateral. c. 7 th segment, lateral. d. 7 th segment, dorsal. e. Apex, dorsal. f. Apex, ventral. 5 st: 5 th sternite, 5 tg: 5 th tergite, 7 scl: 7 th segment lateral sclerite, 7 spr: 7 th segment spiracle, 8 tg: 8 th tergite, 10 tg: 10 th tergite, b ap: basal apodeme of the 7 th tergite, cerc: cercus, msc: muscular tissue.

FIGURE 11. Pelecinobaccha adspersa (Fabricius, 1805), male. a – e. Genitalia: a. Epandrium, dorsal. b. Epandrium, lateral. c. Epandrium, ventral. d. Hypandrium, lateral. e. Hypandrium, ventral. f. Habitus, dorsal. bph: basiphallus, dph: distiphallus, ej ap: ejaculatory apodeme, phapod: phallapodeme, pgt: postgonite, scl: subepandrial sclerite, sur: surstylus.