Neohybos derodactylus (Melander) Melander, 2003

Ale-Rocha, R. & De Carvalho, C. J. B., 2003, Neohybos gen. nov. (Diptera, Empidoidea, Hybotinae) from the Neotropical Region, Zootaxa 387, pp. 1-16 : 6-8

Neohybos derodactylus (Melander) , comb. nov. ( Figs. 1–2 , 26 )

Euhybus derodactylus Melander, 1927:33 ; Smith, 1967:12 (catalogue).

Diagnosis. Body and legs elongate and thin; thorax and abdomen brown; legs yellow except coxae, hind trochanter, distal half of hind femur and tibia and tarsomeres 3–5, brown; one pair of posterior dc bristles long and robust; acr uniserial; wing narrow with brown stigma; fore and mid tarsal pulvilli more than 2X longer than hind ones; upper facets distinctly enlarged.

Holotype female. Body: 5.5 mm. Wing: 4.5 mm.

Head. Flagellum oval as long as escape and pedicel combined. Face long, holoptic. Postcranium dark­brown to black with gray pruinescence. Postocular series with 6 very long upper bristles; occipital series long, uniserial, more numerous inferiorly. Upper facets distinctly larger than inferior ones.

Thorax brown; pronotum shiny distally with pale­brown pruinescence basally. Scutum with purple shine, brown pruinescence on notopleuron, above postalar callus and prescutellar disc. Scutellum shiny, lacking pruinescence. Pleurae homogeneously pruinose. Pronotum long. Scutum with thin and short brown bristles; acr uniserial, scattered on prescutellar disc; dc and intra­alar uniserial, more numerous and disordered near postpronotal lobe; notopleuron with several thin bristles. Outstanding bristles, longer and robust: 2 npl; 1 posterior dc; 1 pair of subapical scutellar bristles long, robust, slightly divergent and 6 lateral bristles short, about one quarter length of apical pair; 1 postalar long and thin; propleuron with 1 minute bristle.

Wing ( Fig. 26 ): long and narrow, hyaline, with brown stigma; anal lobe reduced; alular incision greater than 90º; R4+5 and M1 convergent.

Legs: long, clothed in yellow thin bristles; yellow except coxae, hind trochanter, distal half of hind femur, distal third of hind tibia and tarsomeres 3–5, brown. Hind leg 1.5X longer than foreleg; hind femur long and robust, distinctly narrowed basally; fore tibia conspicuously thickened in basal third, pilose posteriorly; hind tibia cylindrical, falciform. Outstanding bristles: fore tibia with 1A and 1 P preapical; mid tibia with AD series little outstanding, just the 2 more basal bristles robust, 1AV long apical; fore tarsomere 1 with 1A and 1P preapical; mid tarsomere 1 with 1D sub­basal and 1D preapical, 1AV sub­basal and 1AV preapical; hind femur with 8AV spine­like bristles on the distal half, V row with short spines, PV row with 3 bristles near apex, 1D near apex and 1A on distal quarter; hind tarsi lacking spines.

Abdomen: elongate, approximately 3X length of thorax, thin, narrow basally and enlarged apically; brown, clothed in thin yellow bristles; shiny, with scattered pruinescence only on Tg1 and 7; Tg1 and Tg2 with long lateral bristles. Terminalia ( Figs. 1–2 ): ovipositor with cerci short; eighth segment asymmetrical with ventral surface nearly completely membranous; Tg8 reduced to narrow medium plate; St8 covering entire ventral face of segment.

Male. unknown.

Distribution. Costa Rica.

Type material. Holotype Ψ: COSTA RICA, [Cartago], Turrialba, Nov.1922, Pab. Schild; Type Euhybos Derodactylus Mel ; A L Melander Collection 1961; Euhybos derodactylus Mel. ( USNM) (ovipositor in tube with glycerin; right wing mounted on microslides).

Figures

FIGURES 1 – 7. Neohybos species, terminalia. N. derodactylus comb. nov., holotype female: 1, 2, ovipositor, dorsal and ventral view. Figs. 3 – 7. N. hallexus comb. nov., paratype male: 3, epandrium, ventral view; 4, epandrium and cerci, dorsal view; 5, epandrium, right lateral view; 6, epandrium, left lateral view; 7, hypandrium, ventral view. Figs. 1 – 2; 3 – 6 in the same scale (scale bar = 0.5 mm); 7 (scale bar = 0.25 mm).

FIGURES 26 – 30. Neohybos species, wings: 26, N. derodactylus comb. nov.; 27, N. hallexus comb. nov.; 28, N. halteralis comb. nov.; 29, N. leptogaster comb. nov.; 30, N. luridus comb. nov.