Neohybos arcuatus, Ale-Rocha, 2017

Ale-Rocha, Rosaly, 2017, New species of Neohybos Ale-Rocha & Carvalho (Diptera, Hybotidae, Hybotinae) from South America, Zootaxa 4358 (3), pp. 507-531 : 514-515

Neohybos arcuatus sp. nov.

( Figs 16–19 )

Diagnosis. Thorax black, entirely clothed in dense pruinescence except postpronotal lobe shiny, pruinescence pale brown laterally and reddish brown on dorsum of scutum; fore and mid legs pale brown to yellow with tarsomeres 3–5 brown; hind leg dark brown to black, except tibia brown with base and hind tarsomeres 1–4 yellow; hind femur strongly thickened; hind tibia arched with sharp ventral surface; wing brownish; pterostigma brown.

Holotype male. Body: 4.7mm. Wing: 3.9mm. Head: postpedicel 2.5 times longer than wide, as long as length of scape and pedicel combined. Face narrowly dichoptic, shorter than frons. Postcranium clothed in dense pale brown pruinescence. Postocular setae somewhat elongate; occipital setae sparse and disordered, number reduced in lower half of head. Thorax: entirely clothed in dense pruinescence except postpronotal lobe shiny; pruinescence pale brown laterally and reddish brown on dorsum of scutum; scutum and pleura black. Setae black, very short and numerous; acr with 4-serial anteriorly, misaligned, biserial on prescutellar disc; dc uniserial; ial and spal numerous and disordered; 2 npl longer than apical scutellar pair; 1 pal short and thin; 4 pairs of scutellar setae, apical pair parallel, closely approximated, stouter and 5 times longer than lateral setae. Wing: narrow, brownish with brown pterostigma; R4+5 and M1 slightly convergent apically. Legs: Fore and mid legs pale brown, almost yellow, with tarsomeres 1–3 brown; hind leg dark brown to black, except for tibia brown with yellow base and hind tarsomeres 1–4 yellow. Hind femur strongly thickened; hind tibia arched with sharp ventral surface. Setae yellow. Fore tibia with 1 anterior and 1 posterior elongate preapical seta extending beyond mid-length of fore tarsomere 1. Fore tarsomere 1 with 1 ad and 1 pd long preapical seta. Mid tibia with 3 long and robust ad setae (1 basal, 1 on basal fourth, 1 beyond middle); 1 very long ventroapical setae extending to apex of mid tarsomere 1. Mid tarsomere 1 with 1 long sub-basal pv seta, extending beyond apex of tarsomere. Hind trochanter with 2 elongate and robust ventral spine-like setae. Hind femur strongly setose, with 8 spine-like av setae; 1 preapical dorsal seta; ventral row with 17 stout spine-like setae arising from tubercles; 12 long, very robust, spine-like pv setae, similar to av setae. Hind tibia and hind tarsus without strong setae. Abdomen: shiny, dark-brown to black; about 2.6 times longer than thorax; tergite 8 and all sternites covered with pale brown pruinescence. Setae yellow, very thin, short, almost inconspicuous dorsally, elongate laterally and very long on lateral of tergites 1–3 and on distal margin of sternite 8. Terminalia ( Figs 16–19 ): right bacilliform sclerite bearing stout dorsal process, rounded apically. Right surstylus long, slender and folded inward; left surstylus with long and slender process bearing strong apical setae. Hypandrium with posterior margin deeply concave on left side; right lobe wide, about half-length of base of hypandrium, inner margin sinuous and with short spine-like tubercle apically. Postgonite ribbonlike and very slender; phallus robust, tapered distally.

Female. Unknown.

Type material. HOLOTYPE ♂ ( INPA) labelled: “ BRASIL, Rondonia, Ouro Preto do Oeste, Igarapé Mandi , 06– 12.vii.1995, Arm. Malaise, J. A. Rafael & J. Vidal ”; “ Holótipo / Neohybos arcuatus / Ale-Rocha, R. ” [red label]. Specimen in good condition, except for pair of ocellar setae, right antenna and mid right tarsus lost; right wing mounted between microslides; terminalia dissected.

Distribution. Brazil (Rondonia).

Etymology. The specific name is derived from the Latin arcus (bow) in reference to the shape of hind tibia.

Figures

FIGURES 16–19. Neohybos arcUatUs sp. nov. Hypopygium: 16, dorsal aspect; 17, ventral aspect; 18, left epandrial lamella, lateral aspect; 19, right epandrial lamella, lateral aspect.Scale bar = 0.3 mm.