Pelecorhynchus longicauda ( Bigot, 1857 )

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 : 198-199

Pelecorhynchus longicauda ( Bigot, 1857)

( Figs. 27–33 ).

Coenura longicauda Bigot, 1857: 287 . Type locality: " Chile ". Type ♀, loc.?

Material examined. Región Metropolitana: 2 ♂ Talagante 18.XI.1964 col. M. Toro; 1 ♂ Talagante 23.XI.1964 col. Zapata; 1 ♂ Cordillera, El Canelo without date col. M. Etcheverry; 2 ♂ Talagante 23.XI.1964 col. Montes; 1 ♂ Malloco, Peñaflor XI.1959 without col.; Región de O´Higgins: 1 ♂ Cardenal Caro, Pichilemu, El Cardonal 1.I.1954 col. R. Amunategui; Región del Maule: 1 ♂ Linares without date col. Villalobos; Región de La Araucanía: 1 ♂ Malleco, Angol 7.XII.1949 col. P. Salgado; 1 ♂ Malleco, Angol 7.XII.1950 col. M. Fernández; 1 ♂ Malleco, Angol 2.XII.1949 col. Salgado; 1 ♂ Angol, 2.XI.1950 col. Balboa; 1 ♂ Malleco, Angol 8.XII.1949 col. L. Cisternas; 1 ♂ Malleco, Angol 8.XII.1949 col. Sheffield; 1 ♂ Malleco, Angol VIII.1949 col. Pealli; 1 ♂ Malleco, Angol 18.XII.1949 col. M. Guzmán; 1 ♂ Malleco, Angol 1947 col. Pealli; 1 ♂ Malleco, Angol 22.XI.1949 col. R. Cuevas G.; 1 ♂ Malleco, Angol 8.XII.1949 col. Sheffield; 1 ♂ Malleco, Angol 24.XI.1949 col. E. Frinelt; 1 ♀ Malleco, Angol 2.I.1965 col. Cerda.

Diagnosis and comments. Body color shining dark brown. Scutum with two parallel longitudinal yellowish stripes. Scutellum black with long black hairs on the distal margin. Pleura dark brown with long black hairs. Wing infuscated orange. Abdomen shining brown dorsally; tergites 2, 3 and 4 each with a pair of triangular whitish spots extending from the lateral margin to the center ( Fig. 27 ). Sternites 2, 3, and 4 with a pair of oval white spots. This species has the scutellum with black hairs on the distal margin and is most similar to P. xanthopleura , but can be distinguished by the beard and pleural hairs black; it also differs from P. elegans , P. biguttatus and P. penai , which all have yellowish hairs, P. longicauda which has a black beard and black pleural hairs.

Description. Female (N = 1; length = 22.0 mm). Head: eyes black, without color pattern when dry, bare. Frons with dark brown pruinosity, parallel-sided. Parafacial with gray pruinosity and short black pilosity. Ocellar triangle with three ocelli ( Fig. 28 ). Posterior border of the head with black pruinosity and black hairs; vertex black without hairs. Clypeus convex with gray pruinosity and long abundant dark brown hairs ( Fig. 28 ). Gena with dark gray pruinosity and long abundant black hairs continuous with those of the occiput; beard black. Scape and pedicel with dark brown pruinosity and black hairs; first flagellomere brown; apical flagellomeres the same color. Maxillary palpus dark brown with abundant, short black hairs. Proboscis and labellum brown with sparse brown hairs.

Thorax: scutum black with short, sparse black hairs and two parallel longitudinal yellowish stripes. Scutellum black with long black hairs on distal margin. Pleura shining brown with long black hairs. Legs dark brown. Coxa dark brown with black hairs. Wing infuscated orange especially on costal margin.

Abdomen: shining brown dorsally with sparse black hairs mostly located on the lateral margins; tergites 2, 3 and 4 each with a pair of triangular whitish spots, extending from the lateral edge to the center of the sclerite, but not meeting. Sternites shiny dark brown with sparse black pilosity; sternites 2, 3 and 4 each with a pair of oval white spots, without hairs; in some specimens, sternites 3 and 4 without spots.

Male (N = 21; length: 15.0 – 19.5 mm). Head: eyes black, bare, holoptic. Ocellar triangle elevated with three ocelli ( Fig. 29 ). Posterior border of the head with black pruinosity and black hairs; vertex black, bare. Clypeus convex with dark brown pruinosity, and abundant, long black hairs all over its surface. Gena with dark gray pruinosity and abundant long black hairs continuous with those of the occiput; beard black. Scape and pedicel with dark brown pruinosity and black hairs; first flagellomere blackish-brown, apical flagellomeres black. Maxillary palpus dark brown with abundant black pilosity. Proboscis and labellum dark brown, with few black hairs.

Thorax: scutum black with short black hairs and two parallel longitudinal yellowish stripes ( Fig. 30 ). Scutellum black with long black hairs on distal margin ( Fig. 30 ). Pleura with dark brown pruinosity and black hairs. Legs dark brown. Coxa dark brown with blackish-brown hairs. Wing infuscated orange especially on costal margin.

Abdomen: brown dorsally, shining with sparse black hairs on all tergites; tergites 2, 3 and 4 each with a pair of whitish spots, triangular in shape and extending from the lateral margin to the center without meeting medially ( Fig. 31 ). Sternites shining brown with a pair of rectangular white spots on sternites 2, 3 and 4; sternites 3 and 4 with very small spots that are faint or absent. Terminalia ( Fig. 32, 33 ). Cerci one-segmented and prominent, narrow, lobate, apically rounded with 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 a few setae laterally. Gonocoxite broad, large and curved, apically truncate, setose. Gonostylus apex with a curved hook dorsally, ventrally rounded; medial lobe subquadrate. In dorsal view, aedeagus relatively long and narrow, with two long hooks sharp, the space between the hooks broad without spine.

Geographic distribution. Chile (Región Metropolitana to Región de La Araucanía) ( Fig. 34 ).

Figures

FIGURE 34. Geographic distribution of Pelecorhynchus longicauda (Bigot, 1857).

FIGURES 27 – 33. Pelecorhynchus longicauda (Bigot, 1857). 27. Adult male. 28. Head of female in frontal view. 29. Head and thorax in lateral view. 30. Thorax and abdomen in dorsal view. 31. Abdomen in dorsal view. 32. Epandrium and gonocoxites in ventral view. 33. Gonocoxites in dorsal view. Scale bar = 1 mm.