Euhybus longiseta, Wang, Ning, Li, Zhu & Yang, Ding, 2013

Wang, Ning, Li, Zhu & Yang, Ding, 2013, Euhybus newly recorded from Tibet with descriptions of two new species (Diptera: Empidoidea, Hybotinae), Zootaxa 3686 (3), pp. 373-380 : 374-375

1. Euhybus longiseta sp. nov.

( Figs 1 , 2 , 3–7 )

Diagnosis. Arista bare. Hind femur with 3 long thin preapical setae. Fore and mid femora with brownish yellow tips, hind femur entirely black. Mid tibia dark yellow. Hind tarsus entirely black. Hind tibia without dorsal setae. Costal cell and anal lobe not enlarged. Stigma short and rounded (about 1/6 as long as cell r1, not filling apex of cell r1).

Description. Male. Body length 4.1 mm, wing length 3.8 mm.

Head black with pale gray pollinosity. Eyes dark yellow with enlarged upper facets. Setae and setulae on head black; ocellar tubercle weak, with 2 long oc and 2 short posterior setulae. Antenna blackish; pedicel with circlet of subapical setulae; first flagellomere slightly longer than scape + pedicel, about 3 times longer than wide, without dorsal setae; arista 4.35 times as long as first flagellomere, dark brown, bare, with apical 1/4 thin. Proboscis brownish, distinctly shorter than head, thickened, nearly obtuse apically; palpus dark brown with 1 long curved seta at extreme tip.

Thorax black with pale gray pollinosity. Chaetotaxy on thorax black; h absent, 2 long strong npl; hair-like acr biseriate; hair-like dc uniseriate except only 1 posteriormost dc slightly long, 1 psa; scutellum with 6 marginal setulae and 2 long sc. Legs black except tips of fore and mid femora brownish yellow, extreme tip of fore tibia and entire mid tibia dark yellow; fore and mid tarsi yellow with tarsomeres 3–5 blackish, hind tarsus entirely black. Setae and setulae on legs black. Fore femur nearly as wide as mid femur; hind femur 2 times as thick as mid femur, with 3 long thin preapical ad. Hind femur with row of long av spines, basal portion with row of pv spines. Fore tibia distinctly thickened, apically with 3 thin setae (1 posterior seta very long); mid tibia with 2 long thin ad, apically with 4 thin setae (of which 1 pv relatively thick, very long, nearly as long as mid tarsomere 1). Hind tibia without dorsal setae; apically with 1 av, 1 long preapical dorsal seta and 1 long preapical pd. Fore and mid tarsomere 1 with long setae, apically with 1 long thin ad and 1 long thin pd; mid tarsomere 1 with 1 long strong pv near base. Hind tarsomere 1 with some short strong ventral setae. Wing ( Fig. 2 ) lightly infuscate; costal vein with longer setae on basal 2/3; dark brown stigma short and rounded (about 1/6 as long as cell r1, not filling apex of cell r1); veins dark brown, R4+5 and M1 parallel apically. Squama brown with dark brown setulae. Halter dark brown.

Abdomen subshiny blackish with gray pollinosity except hypopygium black; hypopygium indistinctly swollen (nearly as broad as abdomen). Abdominal setae and setulae black.

Male genitalia ( Figs 3–7 ): Left epandrial lamella with inner margin distinctly incised basally; left surstylus rather wide, with three apical processes (median process wide and irregular in shape; lateral process weak; another lateral process long finger-like). Right epandrial lamella with slightly incised inner margin; right surstylus rather wide with two apical processes (one process irregular in shape, other process with long marginal setae). Hypandrium distinctly longer than wide, with slightly incised apical margin and apical lateral process. Phallus basally thick, but apically distinctly narrowed. Right postgonite transversely long, left postgonite short and thick.

Female. Body length 3.1 mm, wing length 3.5 mm. Similar to male, but hind femur 1.8 times as thick as mid femur.

Type material. HOLOTYPE 3, Tibet, Nyingchi (N 29.6518, E 94.3603), Hanmi, 5.viii.2011, Lihua Wang. PARATYPE 1 Ƥ, same data as holotype.

Distribution. China (Tibet).

Remarks. The new species is similar to Euhybus taiwanensis Liu, Li & Yang from Taiwan, but may be separated from the latter by the apices of the fore and mid femora brownish yellow, hind tarsus entirely black and hind femur with 3 preapical ad. In Euhybus taiwanensis , all femora are entirely black, hind tarsomeres 1–2 are yellow, and the hind femur has 2 preapical ad ( Liu et al. 2011).

Etymology. The specific name refers to the long setae of the right surstylus.

Figures

FIGURE 1. Euhybus longiseta sp. nov., male adult. Scale bar = 1 mm.

FIGURE 2. Euhybus longiseta sp. nov., wing. Scale bar = 0.5 mm.

FIGURES 3 – 7. Euhybus longiseta sp. nov. 3. male genitalia, dorsal view; 4. right surstylus, lateral view; 5. left surstylus, lateral view; 6. hypandrium, ventral view; 7. hypandrium and phallic complex, dorsal view. Abbreviations: cer = cercus; eja = ejaculatory apodeme; cercus; lepn = left epandrial lamella; lsur = left surstylus; ph = phallus; postgonite = pgt; repn = right epandrial lamella. Scale bar = 0.1 mm.