Pelecorhynchus toltensis Llanos & González, 2015

Llanos, Lorena, Gonzalez, Christian R. & Córdoba, Mónica Saldarriaga, 2015, Revision of the New World species of the genus Pelecorhynchus Macquart, 1850 (Diptera: Pelecorhynchidae), Zootaxa 3955 (2), pp. 188-210 : 202-204

Pelecorhynchus toltensis Llanos & González sp. nov.

( Figs. 40–48 ).

Type material. Holotype: Chile, Región de La Araucanía: 1 ♂ Cautín, Toltén 17.I.1955 col. H. Toro. Paratypes: Chile, Región Metropolitana: 1 ♀ Santiago, Chile Central without date, col. P. Germain; R. La Araucanía: 1 ♀ Cautín, Toltén 17.I.1955 Col. H. Toro; 2 ♂ Cautín, Toltén 17.I.1955 col. H. Toro; 1 ♂ Malleco, Nahuelbuta, Parque Cabrería 11.I.1978 col. M. Cerda; 1 ♀ Malleco, Nahuelbuta, Parque Pehuenco 20.I.1980 col. Cerda. Additional material. Región de Los Ríos: 1 ♂ Valdivia 12.II. 1964 col. A. Wagenknecht; 1 ♂ Valdivia 8.I.1959 col. A. Wagenknecht; 1 ♀ Valdivia 8.I.1959 col. A. Wagenknecht. Holotype and paratypes in Instituto de Entomología collection, Universidad Metropolitana de Ciencias de la Educación, Santiago, Chile.

Diagnosis and comments. Body color black. Scutum black with two parallel longitudinal yellowish stripes. Scutellum black with yellow hairs on the distal margin. Pleura with abundant yellowish hairs. Wings lightly infuscated orange. Abdomen black dorsally with black hairs on all tergites. Tergites 2 and 3 with a pair of small (0.5 mm or less) central white spots. Tergite 4 with a pair of rectangular spots occupying only anterior part of segment ( Fig. 40 ). P. toltensis is close to P. elegans in the following characters: pleura and distal margin of scutellum with yellowish hairs, tergite 4 with rectangular white spots, and sternites 2 and 3 in both species with white spots reaching the lateral margins of the segments. It differs in that tergites 2 and 3 each have a smaller pair of central white spots, tergites 2 and 3 are without lateral spots, spots of tergite 4 occupy only the anterior part of the segment, and sternite 4 has a pair of rectangular white spots.

Description. Female (N = 4; length = 15.5 – 20.5 mm). Head: eyes dark brown blackish without color pattern when dry, bare. Frons with gray and brown pruinosity and short black hairs, parallel-sided. Parafacial with gray pruinosity and short black pilosity. Ocellar triangle black, without hairs, with three ocelli ( Fig. 41 ). Posterior border of the head with dark gray pruinosity and short, black hairs; vertex with short black hairs. Clypeus convex with gray pruinosity and sparse black hairs. Gena with long and abundant gray and black hairs, continuous with those of the occiput; beard black. Scape and pedicel dark brown with black hairs; first flagellomere blackish-brown, larger than apical flagellomeres; apical flagellomeres blackish, conical. Maxillary palpus dark brown with abundant, short black hairs. Proboscis and labellum blackish-brown.

Thorax: scutum black with two parallel longitudinal yellowish stripes and black hairs. Scutellum black with yellow hairs on distal margin. Postpronotal lobes dark brown with yellowish hairs. Pleura with black pruinosity and abundant long yellowish hairs. Legs dark brown. Coxa brown-blackish with black hairs. Wing infuscated orange especially along costal margin.

Abdomen: black dorsally with black hairs on all tergites; tergites 2 and 3 each with a pair of central, small (0.5 mm or less) white spots; tergite 4 with a pair of rectangular spots occupying only anterior part of segment, with sparse black and white hairs. Sternites shining with sparse black hairs; sternites 2 and 3 dark brown with white spots; sternite 4 with a pair of rectangular white spots.

Male (N = 6; length: 17.0 – 18.0 mm). Head: eyes dark brown-blackish, bare, holoptic. Ocellar triangle black, elevated, without hairs, with three ocelli. Posterior border of head with short gray-black hairs; vertex with short black hairs. Clypeus convex with gray pruinosity and black hairs. Gena with gray pruinosity and black hairs, continuous with those of the occiput; beard black ( Fig. 42 ). Scape and pedicel with dark brown pruinosity and black hairs; first flagellomere blackish-brown, larger than the apical flagellomeres; apical flagellomeres blackish, conical ( Fig. 42 ). Maxillary palpus dark brown with abundant short black hairs. Proboscis and labellum blackishbrown.

Thorax: scutum black with two parallel longitudinal yellowish stripes and short black hairs ( Fig. 43 ). Pleura with black pruinosity and abundant long yellow hairs ( Fig. 44 ). Scutellum black with black hairs on distal margin. Legs dark brown. Coxa brown-blackish with black hairs. Wing infuscated orange especially along costal margin ( Fig. 45 ).

Abdomen: black dorsally, shining with sparse black hairs on all tergites, longer on tergites 3 and 4; tergites 2 and 3 each with a pair of small (0.5 mm), central, circular, whitish spots; tergite 4 with a pair of rectangular white spots reaching the lateral margin ( Fig. 46 ). Sternites shinning with sparse black hairs; sternites 2 and 3 with a pair of rectangular white spots not reaching the lateral margin of the segment; sternite 4 with a pair of rectangular white spots. Terminalia ( Fig. 47, 48 ). Cerci one-segmented and prominent, lobate, apically rounded with abundant small setae. Hypoproct about as long as wide, much longer than more dorsally situated cerci; posterior margin with a broad, shallow, v-shaped emargination. Epandrium large, rectangular and strongly arched, with very long setae laterally. Gonocoxite developed, large and curved, apically rounded, setose. Gonostylus apex with a curved hook dorsally, medially with a prominent subquadrate lobe, setose. In dorsal view, aedeagus narrow and short with two long hooks, the space between the hooks is narrow.

Etymology. The specific name is a noun in apposition taken from type locality.

Geographic distribution. Chile (Región Metropolitana to Región de Los Ríos ( Fig. 49 ).

Figures

FIGURE 49. Geographic distribution of Pelecorhynchus toltensis sp. nov.

FIGURES 40 – 44. Pelecorhynchus toltensis sp. nov. 40. Adult male. 41. Head of female in frontal view. 42. Head in lateral view. 43. Thorax in dorsal view. 44. Head and thorax in lateral view. Scale bar = 1 mm.

FIGURES 45 – 48. Pelecorhynchus toltensis sp. nov. 45. Wing. 46. Abdomen in dorsal view. 47. Epandrium and gonocoxites in ventral view. 48. Gonocoxites in dorsal view. Scale bar = 1 mm.