Hybos sinclairi, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 61-62

publication ID

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

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scientific name

Hybos sinclairi

sp. nov.

Hybos sinclairi View in CoL sp. nov.

( Figs 157–160 View FIGURES 157–160 , 271 View FIGURES 269–277 )

Type material. HOLOTYPE ♂: THAILAND, Chiang Mai Province, Queen Sirikit Botanic Garden , semievergreen forest, 18°53'67.5''N, 98°51'59.7''E, 700m, 4–11.vi.2007, Malaise trap, R. Sawkord & W. Srisuka [ QSBG-2007-216 ] ( QSBG) . PARATYPES: 1♀, same data as holotype ; 1♂, 18°53'17.5''N, 98°58'30.1''E, 784 m, 11–16.vi.2007 : 3♂, Chiang Mai Province, Doi Chiangdao National Park, Headquarters   GoogleMaps , 19°24.278'N, 98°55.311'E, 491 m, 3–9.vi.2008 ; 1♂, Pha Tang   GoogleMaps substation, 19°24.978'N, 98°54.886'E, 526 m, 21–27.v.2008 ( QSBG, NMWC).

Etymology. The species is named in honour of Bradley Sinclair, a dedicated student of Empidoidea .

Diagnosis. A yellow-legged species with clear yellow lower pleura and brownish black upper pleura and scutellum. The hind femur is strongly inflated in the male and strongly spinose ventrally in both sexes. The mid tibia has several strong setae dorsally and ventrally in addition to a very long bristle dorsally near base and another similar bristle ventrally near middle. A strong ventral bristle at base of mid metatarsus and a slightly smaller bristle posteroventrally just distal to it.

Description. Male: body length 4.0– 4.5 mm. Head subshining black, thinly dusted; face brownish black above, yellowish on ventral 0.5. All setae dark; ocellars minute, upper postoculars somewhat curved anteriorly near tip. Antenna greyish black; postpedicel ovate in lateral view, 2.5X long as wide, lacking dorsal seta; stylus bare, 5– 6X long as postpedicel, apical 0.3 abruptly narrower, paler in certain lights. Mouthparts with proboscis dark yellow; palpus very narrow, blackish, with distinct dark apical seta. Thorax with scutum black, rather shining, thinly dusted; postalar callus yellowish white; postpronotal lobe yellowish brown laterally; katepisternum and meron clear yellow; katatergite yellow with brownish anterior margin; anatergite brownish with paler yellowish margins; anepisternum, anepimeron, and mediotergite brownish black; scutellum black on disc (contrasting with katepisternum), posterior margin yellowish below. Acrostichals 3–4-serial, small, fine, posterior acr stronger; dc uniserial, similarly fine, posterior dc strong; a few fine hairs lateral to line of dc but prescutellar area bare; 1 strong (upper) and 1 weaker (lower) npl; 1–2 weak pa; scutellum with pair of strong black bristles and several fine marginal hairs. Legs yellow, tarsomeres 3–5 on all legs dark. Coxae with pale setae, longest on C 3, becoming darker and longer anteroapically on all coxae. F 1 rather stouter than F 2, pv fringe of fine setae as long as limb is deep, at least on basal 0.5. F 2 with ventral fringe of dark hairs 3–4X long as limb is deep near base, becoming shorter distally; 1 blackish curved subapical ad bristle. F 3 strongly inflated, widest ~0.5–0.6 from base; bristles and smaller setulae mostly black; ventral spines comprising ~10–12 long evenly sized bristles behind which are 13–14 shorter bristles rather irregularly 2-serial near base, becoming uniserial near middle and after slight discontinuity, with 4–6 much shorter peg-like setae on distal 0.15; pv fringe of 9–15 bristles complete, weak proximally, becoming strong distally; 2–4 distinct rather proclinate curving black bristles anteriorly on distal 0.5. T 1 with 1 distinct dark seta dorsally at 0.6 and 1 rather longer yellowish anteroapical; ventral hairs numerous, becoming longer distally where 3–4X long as limb is deep. T 2 with 1 strong black bristle 0.7 X long as limb dorsally at 0.2 and 5–6 weaker (but still strong) dorsal bristles throughout; 1 strong black bristle 0.7 X long as limb ventrally at 0.4–0.5, and weaker yellowish bristles at 0.2 and 0.7 from base (latter ~0.4X long as limb); apical circlet of 3–4 fine setae and 1 strong av 0.7X long as MT 2. T 3 slightly swollen apically; dorsal ciliation of rather erect hairs, usually with one at ~0.5 somewhat stronger; apically with distinct blackish anterior and yellowish av bristles. MT 1 with long hairs dorsally and ventrally, continued ventrally on second tarsomere where shorter. MT 2 with 1 strong erect bristle ventrally at base 0.5–0.6X long as segment and 1 slightly smaller bristle posteroventrally at 0.2. MT 3 distinctly short spinose ventrally. Wing membrane faintly tinged brownish; veins brown; stigma brownish, touching costa for complete or almost complete distance between end of R 1 and R 2+3. Squamae with pale fringes. Halter white. Abdomen subshining black dorsally, duller than scutum and with faint bronze reflections; Vent brown, becoming yellowish basally; setae pale, with a few darker hairs admixed, especially distally. Terminalia ( Figs 157–159 View FIGURES 157–160 ) black, with black setae. Right epandrial lamella rather short in dorsal view; left lamella oblique, with anterior margin long and pointed process on inner dorsal margin ( Figs 157, 159 View FIGURES 157–160 ). Right surstylus originating from internal face of right epandrial lamella, long, curved. Left surstylus divided ( Fig. 159 View FIGURES 157–160 ); apical lobe blunt, yellowish brown; subapical lobe strongly angulate and black, a sharply pointed apical process and a broader more or less internally directed rounded process arising from point of angulation. Hypandrium ( Fig. 158 View FIGURES 157–160 ) very elongate, black; with fan of strong black bristles about tip; subapical lobe, yellowish, curved. Female. Differing from male as follows. F 3 less strongly inflated, widest 0.6–0.7 from base; ventral spines less numerous, comprising 5–6 long bristles behind which are 11–12 smaller more or less uniserial bristles. Hairs on MT 1 and ventrally on F 1, F 2 and T 1 somewhat shorter. MT 2 with pv bristle at 0.2 shorter. MT 3 hardly spinose ventrally. T 2 with dorsal bristles at 0.1 and 0.6 longer, almost 0.5X length of dorsal at 0.2. Abdomen paler, brownish dorsally; sternite 8 with posterior margin concave ( Fig. 160 View FIGURES 157–160 ); sternite 10 small, weakly sclerotized, semi-circular; tergite 10 very weakly sclerotized.

Comment. Hybos sinclairi sp. nov. is at present known from two localities in the Thanon Thongchai and Daen Lao ranges of northern Thailand ( Fig. 271 View FIGURES 269–277 ). All specimens have been collected between 491 m and 784 m in highly seasonal dry evergreen forest (also known as semi-evergreen forest) during late May and June during the early part of the wet season. Some exceptionally setose examples of H. chaweewani sp. nov. can appear quite similar to H. sinclairi sp. nov. but can be distinguished by the characters given in the key and by their very different male and female terminalia.


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