Hybos meeamnat, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 42-43

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https://doi.org/ 10.11646/zootaxa.3690.1.1

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scientific name

Hybos meeamnat

sp. nov.

Hybos meeamnat View in CoL sp. nov.

( Figs 101–103 View FIGURES 101–103 , 260 View FIGURES 260–268 )

Type material. HOLOTYPE ♂: THAILAND Chiang Mai Province, Queen Sirikit Botanic Garden , 18°53'67.5''N, 98°51'59.7''N, 700 m, Malaise trap in semi-evergreen forest, 28.v–4.vi.2007, W. Srisuka & R. Sawkord [ QSBG-2007-211 ] ( QSBG).

Etymology. The species is named from the Thai mee amnat (mighty, powerful) in reference to the strongly inflated hind femur.

Diagnosis. An entirely black legged species with all coxae bearing black setae. Distinguished by its uniformly very dark brown wings and presence of a regular line of av bristles beneath the hind femur which form a discrete series on the basal half, clearly distinct from those occurring more distally.

Description. Male: body length 5.5 mm. Head subshining black; face dark reddish yellow about middle. Antenna black; postpedicel ovate in lateral view, 2.5X long as wide; stylus bare, ~5X long as postpedicel, vague discontinuity on distal 0.2 appearing paler in some lights. Mouthparts blackish; palpus very narrow, with fine hairs. Thorax with ground colour black, postpronotal lobe posterolaterally and postalar callus yellowish; dusting brownish on dorsum, rather greyish on pleurae, very faint indications of lateral stripes along line of dc. Posterior dc, 1 npl, pa and 2 sct distinct, other dorsal setae small, hair-like. Legs subshining black; only extreme apex of F 3 below and extreme base of T 3 very dark yellow; mid tarsus vaguely paler than rest of legs. Coxae with blackish hairs and bristles. Hind trochanter with 2 distinct setae posteriorly. F 1 somewhat inflated, widest 0.3 from base, narrowing gradually beyond; pv hairs longer than limb is deep on distal 0.5. F 2 with rather evenly long and spaced distinct av bristles; pv ciliation of fine hairs much shorter, longest basally. F 3 strongly inflated, widest 0.4–0.6 from base, rather evenly covered with distinct dark hairs, lacking strong bristles anteriorly, dorsally or posteriorly; ventral spines (partly obscured by reflexed T 3 in holotype) comprising at least 1 series of short bristles behind which is series of fine hairs becoming longer distally, and immediately in front 1 series of 7–8 closely set strong bristles on proximal 0.5 discontinuous with ~4 slightly smaller more widely spaced bristles on distal 0.5. T 1 with short dark hairs dorsally, rather longer hairs ventrally; apical circlet of bristles strongest anteriorly. T 2 with distinct bristles dorsally at 0.2, 0.5 and 0.75 from base and longer bristles anteroventrally at 0.5 and 0.75, that at 0.75 0.4X long as limb; apical circlet with 1 av bristle much longer than others. T 3 lacking strong bristles, patch of yellowish pile posteroapically. Tarsi with small but distinct paired dorsoapical bristles; MT 1 with dense short hairs below and 1 short black ventrobasal bristle; MT 2 with 1 strong ventrobasal bristle ~0.3X length of segment; MT 3 with short yellowish pile posteriorly. Wing membrane strongly marked yellowish brown, veins brown; stigma hardly distinguished from surrounding dark membrane, reaching costa at ~0.8–0.9 distance between end of R 1 and R 2+3. Squamae with dark and pale hairs admixed. Halter with knob white, stem darker. Abdomen subshining brownish black, duller than thorax, tergites with faintly bronze reflections, strongly pale dusted; bristly hairs pale, longest and more numerous laterally and marginally on tergites 1–3; sternites 6–7 with dark hairs ventrally; sternite 8 with stronger, erect, blackish bristles. Terminalia ( Figs 101–103 View FIGURES 101–103 ) mostly blackish, epandrial lamellae rather narrow viewed dorsally, with numerous black bristles distally. Left ( Fig. 103 View FIGURES 101–103 ) and right surstyli rather short, bluntly pointed apically, inner face distinctly concave. Hypandrium ( Fig. 102 View FIGURES 101–103 ) blackish, broad, apically bifid; left apical process digitiform, right apical process broad, paler, with margin slightly crenulate. Female. Unknown.

Comment. Hybos meeamnat sp. nov. is known only from the holotype male collected in semi-evergreen forest (more usually referred to as dry evergreen forest) in the northern Thanon Thongchai Range, Chiang Mai Province ( Fig. 260 View FIGURES 260–268 ) in late May–early June. In having entirely black legs, hind coxa with dark hairs and stylus entirely bare, H. meeamnat sp. nov. resembles most closely H. longus Yang & Yang, 2004 , H. paknok sp. nov., H. daugeroni sp. nov. and H. xishuangbannaensis Yang & Yang, 2004 . However, in these four species, the wing membrane is never strongly and uniformly darkened and there is no obvious median disjunction in the strength and spacing of anteroventral spines on the hind femur as in H. meeamnat sp. nov.













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