Neohybos tenuis, Ale-Rocha, 2007

Ale-Rocha, R., 2007, New species of Neohybos Ale-Rocha & Carvalho (Diptera, Hybotidae, Hybotinae) from Colombia, Ecuador and Peru, Zootaxa 1503, pp. 33-54 : 51-53

Neohybos tenuis sp. n.

( Figs. 66–73 , 81 )

Diagnosis. Thorax dark-brown, brown pruinose except dorsum of pronotum, anterior two-thirds of scutum and postpronotal lobe lacking pruinescence; thoracic setae elongate, brown; 1 dc pair long and strong on prescutellar disc; thorax and abdomen with bluish shine; wing evenly brownish, stigma brown; legs brown to dark-brown except mid tibia and tarsomeres 1 and 2 yellow; legs and abdomen clothed in yellow bristles.

Description. Holotype male. Body: 4.8 mm. Wing: 3.8 mm. Antenna placed at middle of head; postpedicel 2 times longer than wide, as long as scape and pedicel combined. Face narrowly dichoptic, as long as frons. Pair of ocellar setae lost. Postcranium with grayish pruinescence and elongate setae.

Thorax dark-brown, brown pruinose except dorsum of pronotum, anterior two-thirds of scutum and postpronotal lobe lacking pruinescence; setae elongate and brown, setae of prescutellar disc 1.5 times longer than anterior ones; dc uniserial, acr uniserial anteriorly and biserial on prescutellar disc; 1 dc pair long and strong on prescutellar disc; 2 npl as long as scutellar apical pair; scutellum with 1 apical pair divergent, long and strong and 3 thin lateral pairs about one-third of apical pair.

Wing ( Fig. 81 ) narrow, evenly brownish, stigma brown; R45 and M1 parallel.

Legs dark-brown except mid tibia, base of hind tibia and tarsomeres 1 and 2 yellow; clothed in yellow bristles. Hind femur 5.3 times longer than wide; hind tibia tubular, slightly curved. Outstanding bristles: fore tibia with 1 posterior preapical bristle reaching half of corresponding tarsomere 1, one anterior about half of length of posterior bristle; mid tibia with 1 anterodorsal bristle near base and 1 at basal third, 1 ventral preapical bristle slightly shorter than corresponding tarsomere 1; mid tarsomere 1 with 1 posterior bristle at basal third reaching base of tarsomere 2; hind trochanter with 1 thorn and 2 spine-like bristles ventrally; hind femur with 1 dorsal bristle at distal quarter, 1 anterodorsal preapical and 1 anterior bristle at distal third, 11 anteroventral, 14 ventral and 12 spine-like posteroventral bristles.

Abdomen 3.3 times longer than thoracic length; brown to dark-brown, shiny, with brown pruinescence on Tg8 and St5–8; bristles yellow and thin; St8 wider than long with long setae on distal margin. Terminalia ( Figs. 66–70 ): right epandrial lamella deeply cleft distally, with two long processes; hypandrium long with right hypandrial lobe broad, setose, bifid apically, left hypandrial lobe not developed; dorsal bridge complete.

Female. Similar to male except for: posterior dc pair lacking; bristles of thorax slender; 2 strong ventral bristles on hind trochanter; hind tarsomere 1 with 2 posteroventral thorns near base; anterior bristle of hind femur lacking, hind femur with 8 anteroventral and 11 ventral bristles on apical two-thirds, 4 short posteroventral thorns at distal quarter, remaining bristles of posteroventral series thin and elongate, about 3 times length of thorns. Terminalia: Tg7 with distal margin rounded, base extending dorsoventrally; segment 8 slightly asymmetrical, partially sclerotized on basal half, membranous on remaining.

Distribution. Ecuador, Colombia.

Type material. Holotype male: ECUADOR: Napo, Tena , 11–18.iv.1976, M. Cooper, BM1995 E-90 ( BMNH) (not dissected) . Paratypes: same data, 1 male, 2 females ( BMNH); COLOMBIA, Putamayo , Villa Garzon, 17.viii.1978, M. Cooper, BM1995 E-90, 1 male, 1 female ( INPA) .

Variation: the general coloration varies from brown to dark -brown.

Etymology. Derived from Latin " tenuis " = thin, fine; refers to the general aspect of the insect.

Figures

FIGURES 66–73. Terminalia of Neohybos tenuis, sp. n. 66–70, male: 66, epandrium, ventral view (apex of hypandrium outlined); 67, epandrium and cerci, dorsal view; 68,69, left and right epandrial lamellae, lateral view; 70, hypandrium, ventral view. 71–73, female: dorsal, lateral and ventral views. Figs 66–70; 71–73 in the same scale.

FIGURES 74–81. Wings of Neohybos: 74, N. bicolor sp. n.; 75, N. brunnescens sp. n.; 76, N. colombiensis sp. n.; 77, N. cooperi sp. n.; 78, N. cupreus sp. n.; 79, N. elegans sp. n.; 80, N. fuscipes sp. n.; 81, N. tenuis sp. n.