Hybos elongatus, Li, Zhu, Wang, Ning & Yang, Ding, 2014

Li, Zhu, Wang, Ning & Yang, Ding, 2014, New species of Hybos Meigen from Northwest China (Diptera: Empidoidea, Hybotinae), Zootaxa 3786 (2), pp. 166-180 : 168-169

2. Hybos elongatus sp. nov.

( Figs 1–4 )

Diagnosis. First flagellomere much elongated, longer than scape and pedicel combined, with 1 dorsal setula; arista rather short and bare. R4+5 and M1 weakly convergent at extreme tip. Legs black except hind knees brownish. Left epandrial lamella much longer than right epandrial lamella. Hypandrium apically bifurcated with long acute right lateral process and short truncate right lateral process.

Description. Male. Body length 3.2 mm, wing length 2.5 mm.

Head black with pale gray pollinosity, except occiput shiny. Eyes contiguous on frons, brownish yellow with distinctly enlarged upper facets dark yellow. Setulae and setae on head black; ocellar tubercle distinct, with 2 long oc but without short posterior setulae. Antenna black; scape without setulae, pedicel with circlet of subapical setulae; first flagellomere much elongated, longer than scape and pedicel combined, with 1 dorsal setula; arista rather short (nearly as long as basal 3 antennal segments) and bare, apical 2/5 or so thin. Proboscis slightly shorter than head, blackish. Palpus blackish, with 4 ventral setulae.

Thorax black with pale gray pollinosity. Setulae and setae on thorax black, setulae on scutum short and rather sparse; ppn absent, 2 npl (posterior npl long), uniseriate dc nearly as long as irregularly biseriate acr, 1 short weak prsc, 1 psa slightly longer than prsc; scutellum with 4 short marginal setulae (2 setulae between sc) and 2 long sc. Legs black except hind knees brownish. Setulae and setae on legs black. Fore femur 1.25 times and hind femur 2.25 times as wide as mid femur. Fore and mid femora each with row of pv. Hind femur with 2 long spinose preapical ad and nearly two rows of spinose ventral setae on tubercles. Fore tibia slightly thickened. Hind tibia apically and tarsomeres 1–2 slightly thickened. Fore tibia with 1 ad near apex and 4–5 long setula-like pv on apical 2/3; apically with 4–5 setae (1 pv very long and setula-like). Mid tibia with 1 ad near apex; apically with 4 setae (1 av and 1 pv long). Hind tibia with several long setula-like dorsal setae on apical 1/2, apically with 4–5 weak setae (1 long setula-like dorsal seta erect). Hind tarsomeres 1–2 with short ventral setae. Wing nearly hyaline, stigma dark brown; veins dark brown, R4+5 and M1 weakly convergent at extreme tip. Squama brownish yellow with yellow setulae. Halter brown with knob somewhat pale.

Abdomen curved downwards, subshiny black with pale gray pollinosity; hypopygium distinctly swollen. Setulae and setae on abdomen black.

Male genitalia ( Figs 1–4 ). Left epandrial lamella much longer than right epandrial lamella, with slightly convex inner margin near middle; left surstylus long finger-like, with short basal process and short acute inner process. Right epandrial lamella basally wide with convex inner margin; right surstylus short and thick, with truncate apical margin weakly serrate. Hypandrium distinctly longer than wide, apically bifurcated with long acute right lateral process and short truncate right lateral process.

Female. Unknown.

Type material. HOLOTYPE ♂, CHINA, Tibet, Medog (N29°19′ 41.38″ E95°19′ 55.55″), 2011. VIII.15, L.H. Wang.

Remarks. The new species is somewhat similar to H. henanensis Yang & Yang from Henan, but it may be separated from the latter in the following characters: arista rather short (nearly as long as basal 3 antennal segments), bare; left epandrial lamella much longer than right epandrial lamella; left surstylus much elongated with short basal process and short acute inner process. In H. henanensis , the arista is distinctly longer than basal 3 antennal segments, pubescent; the left epandrial lamella is slightly shorter than right epandrial lamella; and the left surstylus is not elongated and without basal and inner processes ( Yang & Yang 2004).

Etymology. The specific name refers to the elongated first flagellomere.

Figures

FIGURES 1 – 4. Hybos elongatus sp. nov. (male). 1. Genitalia, dorsal view; 2. right surstylus; 3. left surstylus; 4. hypandrium, ventral view. Abbreviations: cer = cercus; lepn = left epandrial lamella; lsur = left surstylus; repn = right epandrial lamella; rsur = right surstylus. Scale bar = 0.1 mm.