Pelecorhynchus elegans ( Philippi, 1865 )

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 : 193-195

Pelecorhynchus elegans ( Philippi, 1865)

( Figs. 8–14 ).

Coenura elegans Philippi, 1865: 727 . Type locality: Chile. "PropeLlico". Type ♂ fragments in Museo Nacional de Historia Natural, Santiago.

Coenura albopunctata Schiner, 1868: 77 . Type locality, " Chile ". Type ♂, Vienna Natural History Museum. Pelecorhynchus darwini Ricardo, 1900: 102 . Type locality: Chile, Chiloe, "Sudamerica coast." ♂ Type in British Museum (Natural History).

Material examined. Región de Valparaíso: 1 ♀ Los Andes, Río Blanco Diciembre 1958 Col. A. Wag; 1 ♀ Mantagua, col. R. Cerda; 3 ♀ Mantagua, col. P. Cerda; 1 ♀ Bosque de Quintero, col. P. Cerda; 1 ♀ Quintero, Las Palmas, col. P. Cerda B.; 1 ♀ Quintero, Las Palmas, col. G. Cerda B.; 1 ♀ Quintero, Las Palmas, col. G. Cerda B; 1 ♀ Los Andes, Río Blanco XII.1958 Col. A. Wag.; Región Metropolitana: 1 ♀ Maipo, Rungue, col. M. Cerda; 1 ♂ La Obra no date and col. T. Ramírez; Región del Maule: 5 ♂ Linares II.1976 Col. Villalobos; 1 ♀ Linares, Rari 16.XII.1967 Col. R. H. González; 1 ♂ Linares Febrero 1975 Col. Villalobos; 1 ♂ Linares 1.II.1956 Col. H. Toro G.; Región del Bío-Bío: 1 ♂, Candelaria, no date and col, 1 ♀ Arauco, Contulmo no date and col. Etcheverry; 1 ♀ Parque de Lota, no col; 1 ♀ Ñuble, Las Trancas, col. P. Vidal; 2 ♀ Concepción, no col; 2 ♀ Ñuble, General Cruz, col. G. Moreno; 1 ♀ Ñuble, Chillán, P. Comadres, col. S. Roitman; 1 ♀ Ñuble, Chillán, P. Marchant, col. S. Roitman; 1 ♀ Chome, Playa El Burro 8.I.2010 Col. R. Barahona; 1 ♂ Candelaria without date Col. Cerda; Región de La Araucanía: 1 ♂ Malleco, Angol, 8.XII.1949 Col. E. Frindt; 1 ♀ Malleco, Liucura 16.II.1974 Col. Herrera; 1 ♀ Malleco, Nahuelbuta, Parque Cabrería, col. Cerda; 1 ♀ Malleco, Nahuelbuta, Parque Pehuenco, col. M. Cerda; 1 ♀ Malleco, Col. Etcheverry; Región de Los Lagos: 1 ♂ Palena, Río Blanco XII. 1958 Col. A. Wag.

Diagnosis and comments. Body color black. Scutum with two parallel longitudinal whitish stripes. Scutellum black with golden hairs on the distal margin. Pleura brown with long and abundant yellowish and orange hairs. Wing slightly infuscated orange. Abdomen with tergites 2 and 3 with a pair of rounded central white spots rounded and a pair of small spots on the lateral margins, tergite 4 with a pair of rectangular spots occupying almost the entire segment ( Fig. 8 ). P. elegans is close to P. biguttatus in the following characters: pleura and the distal margin of scutellum with yellowish-orange and golden hairs, respectively, with rectangular white spots on tergite 4, but differs by having a pair of central white spots and a pair of lateral white spots on tergites 2 and 3, while in P. biguttatus tergites 2 and 3 are completely black. P. elegans has white spots on sternites 2, 3 and sternite 4 with two central white spots forming a broad band occupying half of the segment, while in P. biguttatus sternites 2 and 3 have small white spots, and sternite 4 shows a thin band, a quarter of the height of segment.

Description. Female (N = 24; length = 14.5 – 22.0 mm). Head: eyes dark brown without color pattern when dry, bare. Frons with black pruinosity, with short black hairs, parallel-sided, with three ocelli ( Fig. 9 ). Parafacial with gray pruinosity and short black pilosity. Posterior border of the head gray with black hairs, brown close to the margin; vertex dark brown without hairs. Clypeus convex with gray pruinosity and long black hairs on surface. Gena with gray pruinosity and long yellowish and orange hairs continuous with those of the occiput, beard yellowish. Scape and pedicel with dark brown pruinosity and black hairs; first flagellomere blackish brown larger than the pedicel; apical flagellomeres black. Maxillary palpus short dark brown with long black hairs. Proboscis and labellum dark brown.

Thorax: Scutum black with short and sparse black hairs, with two parallel longitudinal whitish stripes. Scutellum black with golden hairs on the distal margin. Pleura with brown pruinosity, covered with long, abundant yellowish and orange hairs. Legs dark brown with brown hairs. Wing slightly infuscated orange mainly in the costal margin.

Abdomen: black dorsally, shining with sparse abundant black hairs on all tergites; tergites 2 and 3 with a pair of central whitish spots of approximately 1 mm diameter and a pair of small white spots on the side margin of both segments, larger on tergite 3; tergite 4 with a pair of rectangular white spots occupying almost the entire segment with abundant white hairs. Sternites 2 and 3 with a white spots that occupy almost the entire segment; sternite 4 with a white band.

Male (N = 30; length: 18.5 – 21.5 mm). Head: eyes dark brown, bare, holoptic. Ocellar plate elevated with three ocelli dark brown. Posterior border of the head with gray pruinosity, and yellowish hairs, brown near border; vertex dark brown without hairs. Clypeus less convex than female with gray pruinosity, and long abundant black hairs, erect. Gena with gray pruinosity and black hairs, continuous with those of the occiput and beard yellow. Scape and pedicel with dark brown pruinosity, and black hairs; first flagellomere larger than the pedicel blackish brown; apical flagellomeres black, conical apically. Maxillary palpus, dark brown with black pilosity, shorter than female. Proboscis and labellum dark brown, shorter than female.

Thorax: Scutum black with short and sparse black hairs, with two parallel longitudinal whitish stripes. Scutellum black with golden hairs on the distal edge ( Fig. 10 ). Pleura with brown pruinosity and long abundant yellowish orange hairs ( Fig. 11 ). Legs dark brown with brown hairs. Wings slightly infuscated orange especially on costal margin.

Abdomen: black dorsally, shining with sparse black hairs on all tergites ( Fig. 12 ); tergites 2 and 3 with a pair of central whitish spots and a pair of small white spots on the side margin of both segments; tergite 4 with a pair of rectangular white spots occupying almost the entire segment with abundant white hairs on the spots and margin of the segment. Sternites shining and with sparse black hairs; sternites 2 and 3 with a pair of lateral white spots; sternite 4 with a white band. Terminalia ( Fig. 13, 14 ). Cerci one-segmented and prominent, 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, base width, and with long setae. Gonocoxite developed, large and curved, apically truncate, setose. Gonostylus pointed sharpened, and without a hook at the apex; medial lobe prominent and upturned. In dorsal view, aedeagus relatively short and broad, with two long hooks sharp.

Geographic distribution. Chile (Región de Valparaíso to Región de Los Lagos) ( Fig. 15 ).

Figures

FIGURE 15. Geographic distribution of Pelecorhynchus elegans (Philippi, 1865).

FIGURES 8 – 14. Pelecorhynchus elegans (Philippi, 1865). 8. Adult male. 9. Head of female in frontal view. 10. Thorax and abdomen in dorsal view. 11. Thorax and abdomen in lateral view. 12. Abdomen in dorsal view. 13. Epandrium and gonocoxites in ventral view. 14. Gonocoxites in dorsal view. Scale bar = 1 mm.