Dasydorylas nigellus (Rafael, 1991)

Figs 27–39, 53

Eudorylas nigellus Rafael, 1991: 156, figs 12–16, 37.

Dasydorylas nigellus – Rafael & Ale-Rocha 2004: 12.

Diagnosis

Male

Postpedicel with acuminate apex. Vein M 1 straight. Fore and mid femora with conspicuous ventral ctenidia; hind femur without ventral ctenidia. Tergite 1 completely covered by brown pruinosity, with spot dark brown pruinose dorsocentrally and six black and long setae laterally; tergites 2–4 with posterior thin margins brown pruinose; tergite 5 with posterior wide margin gray-brown pruinose. Surstyli equal to epandrium length I dorsal view. Both surstyli thickened in basal half, thin in distal half, with apices outwards-directed; both surstyli with tips downward-directed and rounded apex when seen in lateral view. Apex of phallic guide stout, with margin slightly straight in lateral view. Ejaculatory apodeme funnel-shaped. Phallus trifid, thin, with ducts distinctly separated only in the apex.

Material examined

COLOMBIA – Boyacá • 1 ♂; “ SFF [Santuario de Fauna y Flora] Iguaque, Cab. [Cabaña] Mamaramos; 06°26′ N, 73°27′ W; 2855 m [eters]; 13–30.Jul [VII].2000; P. Reina leg.”; IAvH M380 (photographed specimen) .

Intraspecific variability

Male

Rafael (1991) provided a complete description and illustrations of the Brazilian holotype; however, we found variations in the Colombian specimens, therefore, we provide a comparison of the variations between the Colombian and Peruvian specimens (in parentheses, when applicable).

MEASUREMENTS. Wing length 5.9 mm.

HEAD (Figs 27–28). Eyes contiguous for 20 facets. F, EM, V (mm) = 0.3, 0.5, 0.1. Frontal triangle dark brown, gray-brown pruinose, with callus shiny dark brown (vs frontal triangle opaque black, with callus shiny black in the holotype). Occiput brown, gray-brown pruinose. Antenna (Fig. 29) brown, pedicel with two setae dorsally, three ventrally; postpedicel with acuminate apex (vs antenna black, pedicel with three setae dorsally and four setae ventrally; see Rafael 1991: fig. 12). LPP/WPP = 2.9.

THORAX (Figs 27–28, 30). Postpronotal lobe dark brown, brown pruinose, with four long setae along upper margin (vs postpronotal lobe opaque black). Scutum dark brown, gray-brown pruinose, with dorsocentral setae conspicuous (vs scutum opaque black, brown pruinose). Notopleuron concolorous with scutum (vs notopleuron opaque black, brown pruinose). Scutellum concolorous with scutum (vs opaque black, brown pruinose). Mesopleuron and mediotergite brown, gray-brown pruinose (vs mesopleuron and mediotergite black, brown pruinose).

WING (Fig. 31). Length 5.9 mm. LW/MWW = 3.9; LTC/LFC = 1.9. Membrane brown infuscated, vein M 1 straight. Halter stem dark brown, except beige third medial, knob dark brown.

LEGS (Fig. 27). Coxae dark brown, gray-brown pruinose (vs coxae black); trochanters brown, brown pruinose (vs trochanters black); femora dark brown, gray-brown pruinose, except brown apices (vs femora black); tibiae dark brown, gray-brown pruinose, except basal quarter; tarsomeres 1–4 brown, 5 brown; pulvilli yellowish brown.

ABDOMEN (Figs 28, 32). Ground color velvety dark brown, with inconspicuous scattered setae; tergite 1 completely covered by brown pruinosity, with spot dark brown pruinose dorsocentrally (vs abdomen opaque black, gray pruinose) and six black and long setae laterally; tergites 2–4 with posterior thin margins brown pruinose; tergite 5 with posterior wide margin gray-brown pruinose; tergites and sternites 6 and 7 as in Fig. 33. Syntergosternite 8 dark brown, gray-brown pruinose, shorter than tergite 5, with a membranous area apically (Fig. 32) (vs Syntergosternite 8 acuminate, larger than tergite 5; see Rafael 1991: fig. 13).

TERMINALIA (Figs 33–39). Epandrium and surstyli dark brown (Fig. 34). Surstyli (Figs 34–36) subsymmetrical, equal to epandrium length, setose marginally. Both surstyli thickened in basal half, thin in distal half, with apices outwards-directed in dorsal view (Fig. 34); left surstylus slightly thinner than right (Fig. 34) (vs surstylus long; see Rafael 1991: fig. 15), both surstyli with tips downward-directed and rounded apex when seen in lateral view (Figs 35–36). Gonopods asymmetrical; right gonopod slightly thicker than left in ventral view (Fig. 37). Apex of phallic guide stout, with apex hook-shaped and upper margin slightly straight in lateral view (Fig. 37). Ejaculatory apodeme funnel-shaped (Fig. 39). Phallus trifid, thin, with ducts distinctly separated only in distal quarter (Figs 37–38).

Female

Unknown.

Geographical distribution

Colombia (Boyacá) (new record), Peru (Huánuco) (Fig. 53).

Habitat

The specimen was collected in the Santuario de Fauna y Flora Iguaque reserve, where the vegetation is composed of cloud Andean forests of the cordillera of the Northeast region of Colombia.