Hybos hylobates, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 28-29

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

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scientific name

Hybos hylobates

sp. nov.

Hybos hylobates View in CoL sp. nov.

( Figs 55–58 View FIGURES 55–58 , 252 View FIGURES 251–259 , 290 View FIGURES 283–290 )

Type material. HOLOTYPE ♂: THAILAND, Petchaburi Province, Kaeng Krachan National Park , km33/helipad , 12°50.177'N, 99°20.688'E, 735 m, 8–15.vi.2007, Malaise trap, leg. Sirichai [ T5265 ] ( QSBG) GoogleMaps . PARATYPES: 2♀, same data as holotype ; 1♀, 18–25.i.2009: 6♂, 17♀, Kaeng Krachan National Park   GoogleMaps , Panernthung subst'n., 12°49.25'N, 99°21.54'E, 660 m, 27.vi.2008 ; 1♀, Panernthung   GoogleMaps /km27, 12°49.302'N, 99°22.263'E, 950 m, 8– 15.vi.2009 ; 1♂, 1♀, Panernthung   GoogleMaps /km27/water pump, 12°49.151'N, 99°22.483'E, 970 m, 26.ix.-3.x.2008, 10– 17.x.2008 ; 1♂, 1♀, Panernthung   GoogleMaps /km30, 12°49.598'N, 99°21.827'E, 5–12.ix.2008, 26.ix–3.x.2008 ; 1♀, Panernthung   GoogleMaps /km30; old lavatory, 12°49.484'N, 99°21.909'E, 970 m, 4–11.vii.2008 ( QSBG and NMWC).

Etymology. The species is named from the Greek hylobates (forest-roamer) in reference to its forest habitat.

Diagnosis. A black legged species with entirely pale setae on coxae, and stylus subplumose on basal 0.8. Mid tibia with 2 dorsal and 1 ventral seta very long (0.4X length of limb). Male hind femur strongly inflated and spinose, female less distinctly so. Mid femur without long fine bristles anteriorly and ventrally. Front metatarsus of male with pv ciliation of long apically curved hairs. Female terminalia with tergite 8 elongate rectangular and sternite 8 narrowly triangular.

Description. Male: body length 3.5–4.0 mm. Head subshining black, dusted greyish; face black, vaguely yellowish black below; postocular setae black, lower occipital setae paler. Antenna black; postpedicel ovate in lateral view, 2.0–3.0X long as wide, without distinct dorsal seta; stylus 4–5X long as postpedicel, subplumose on proximal 0.8, hairs as long or slightly longer than stylus is deep, apical 0.2 bare. Mouthparts blackish, palpus narrow, with 1–2 distinct dark hairs subapically and another smaller near base, otherwise short pilose. Thorax with ground colour black; scutellum yellowish at extreme base; postalar callus anterolaterally and pleura vaguely about base of wing very narrowly dirty white; dorsum rather thinly dusted, without stripes from any point of view; acr biserial, fine and hair-like; dc uniserial, similar to acr but posterior dc and acr before prescutellar area conspicuously stronger; 2 npl and 1 pa strong; scutellum with 2 long sct and 4–5 paler fine marginal hairs. Legs subshining black, thinly dusted; ‘knees’ of all legs narrowly dark yellowish. Coxae with hairs and bristles entirely pale. F 1 somewhat inflated basally, ~1.5X wide as tip at 0.3 from base viewed from below; ventral fringe of pale hairs about as long as limb is deep medially, virtually absent distally. F 2 with only inconspicuous hairs anteriorly; pv fringe medially with fine hairs about as long as limb is deep; av fringe shorter, inconspicuous. F 3 distinctly inflated, widest 0.6–0.7 from base, in profile ventral margin linear, dorsal margin evenly curved; ventral spines strong comprising 5–7 anteroventrals, most of which are conspicuously longer than limb is deep, and ventral irregular series of 10–12 spines some of which are obviously much shorter than limb is deep; strong anterior bristles at 0.6, 0.8 and 0.9 from base; pv fringe of strong black bristles, longest at 0.8, with weaker yellowish hairs and bristles admixed. T 1 with fine dorsal bristle at 0.6 from base; pv ciliation becoming 2X long as limb is deep distally, shorter basally; apical circlet inconspicuous except 1 strong anteroapical ~0.5X length of MT 1. T 2 with strong bristles 0.6 X long as limb dorsally at 0.4 and ventrally at 0.5, one dorsally at 0.15 slightly shorter; apical circlet strong with 1 av 0.7–0.8 as long as MT 2. T 3 indistinctly swollen on distal 0.3, strong fine bristles dorsally at 0.45, 0.55 and tip 3X long as limb is deep. A few very fine longish hairs ventrally, short yellowish pile behind on apical 0.3. MT 1 with 2 short strong bristles near base, pv ciliation of long apically curved hairs conspicuously longer than other fine hairs on segment. First and second tarsomeres or front and mid legs with pair of distinct but very fine erect anteroapical and posteroapical hairs. MT 2 with strong seta near base 0.7X length of segment. MT 3 with spine-like setae ventrally and short yellowish pile behind. Wing membrane tinged yellowish brown, veins brown; stigma distinct, brown, long, reaching costa 0.7–0.8 distance between end of R 1 and R 2+3. Squamae with pale fringes. Halter white. Abdomen black, dorsum rather thickly dusted brownish black, ventrally more shining. Tergites 1–4 with long, mostly pale setae on posterior margins, especially laterally. Terminalia ( Figs 55, 56 View FIGURES 55–58 ) with black setae; left epandrial lamella broad, inner margin with two small irregular processes; left surstylus apparently completely fused with tip of epandrial lamella, bearing short inwardly direct peg-like black setae; right epandrial lamella rather narrow; right surstylus long, strongly curved inwards and twisted with apex pointed in dorsal view, flattened in posterolateral view; hypandrium ( Fig. 56 View FIGURES 55–58 ) with two long inwardly directed apical processes, strongly setose distally. Female. Similar to male but legs more slender, especially F 3 which is less strongly inflated, narrower basally. F 3 with ~5 strong anteroventrals; ventral spines less irregular, almost linear, evenly sized, obviously shorter than limb is deep; only 3 strong black bristles in pv fringe on distal 0.3. MT 1 without pv ciliation of long apically curved hairs. Abdomen with darker hairs on posterior margin of tergites. Terminalia ( Figs 57, 58 View FIGURES 55–58 ) shining black, with black setae; sternite 8 elongate triangular in ventral view ( Fig. 58 View FIGURES 55–58 ), bounded laterally by elongate rectangular lateral lobes of tergite 8; sternite 10 small, subquadrate, reflexed dorsally from apex of sternite 8; tergite 10 with strongly sclerotized lateral lobes, very weakly sclerotized dorsally.

Comment. Hybos hylobates sp. nov. might be confused with Hybos tetricus sp. nov. or H. thepkaisoni sp. nov. and the differences between them are discussed in the species account for H. thepkaisoni sp. nov. Hybos hylobates sp. nov. has only been found in predominantly dry evergreen forest biotopes between 660 m and 970 m at Kaeng Krachan National Park in the Tenasserim Hills of western Thailand ( Fig. 252 View FIGURES 251–259 ). Most specimens were taken between June and October (with peak abundance in June) suggesting that adults are active predominantly during the wet season ( Fig. 290 View FIGURES 283–290 ).


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