Hybos bispinatus, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 19-20

publication ID

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

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scientific name

Hybos bispinatus

sp. nov.

Hybos bispinatus View in CoL sp. nov.

( Figs 1 View FIGURES 1–4 , 31–34 View FIGURES 31–34 , 247 View FIGURES 242–250 , 286 View FIGURES 283–290 )

Type material. HOLOTYPE ♂: THAILAND, Loei Province, Phu Ruea National Park , Hua Dong Tamsun , 17°29.54'N, 101°20.995'E, 1130 m, 26.v–2.vi.2007, Malaise trap, Patikhom Tumtip [ T2641 ] ( QSBG) GoogleMaps . PARATYPES:

4♂, 4♀, same data as holotype ; 3♂, same data as holotype, 19–26.v.2007 ; 1♂, 26.vii.-2.viii.2006: 1♂, 4♀, Chantaburi Province, Khao Kitchakut National Park, access track to Buddhas Foot , 12°49''N, 99°21''E, ~ 100 m, 3.vii.2008 ; 1♂, Campground / Prabaht Unit   GoogleMaps , 12°48.852'N, 102°9.204'E, 99 m, 1–7.vii.2008: 4♀, Sakon Nakhon Province, Phu Phan National Park, Kam Hom waterfall at Haew Sin   GoogleMaps chai, 17°7.415'N, 104°1.179'E, 347 m, 344 & 347 m, 22–30.ix.2006 ; 1♀, car park at Kam   GoogleMaps hom waterfall, 17°7.411'N, 104°1.016'E, 147 m, 10–16.ix.2006: 1♂, Chaiyaphum Province, Pa Hin Ngam National Park, car park at Tung Dok Grajeaw   GoogleMaps , 15°38.438'N, 101°23.576'E, 780 m, 12–18.vii.2006: 1♂, 2♀ creek at Tung Dok Grajeaw   GoogleMaps , 15°38.391'N, 101°23.609'E, 750 m, 6–12.vii.2006, 19–24.vii.2006 ; 1♂, 1♀, Ecotone   GoogleMaps between mix deciduous/dry dipterocarp, 15°38.132'N, 101°23.922'E, 698 m, 11–18.viii.2006 ; 2♂, Tung Dok Grajeaw   GoogleMaps , 15°38.208'N, 101°23.556'E, 720 m, 6–12.vii.2006 ( NMWC, QSBG).

Etymology. The specific epithet refers to the two spines of the left epandrial lamella.

Diagnosis. A species with thorax black and legs entirely yellow including the front tibiae and tarsi. The antennal stylus is bare and the wing stigma only weakly marked and there is only one strong bristle on the mid tibia dorsally. Male left epandrial lamella with 2 (occasionally 3) very strong subapical bristles, right surstylus deeply and narrowly bilobed. Female sternite 8 broadly triangular to subquadrate, with short hairs.

Description. Male: length 2.8–3.2 mm. Head subshining black; face distinctly yellowish below. Postocular setae black, a few longish dark hairs on lower occiput. Antenna black, postpedicel ovate in lateral view, ~2.0–2.5 X long as wide; stylus ~5X long as postpedicel, black, bare, narrower on distal 0.2. Mouthparts yellowish black, palpus very narrow, with distinct fine seta near tip. Thorax with ground colour black, often paler about postalar callus and scutellum laterally, pleura sometimes rather vaguely yellowish black; scutum subshining, thinly dusted, perhaps more strongly in prescutellar area; acr fine, small 2–4 serial; dc uniserial; posterior dc and acr in front of prescutellar depression strong; 1 strong and 1 weak npl, 1 small pa and 2 distinct sct. Legs entirely yellow with only apical tarsomeres of all legs slightly dusky, base of T 3 brownish and sometimes small dark spot anteroventrally on F 3 just before tip. Coxae with yellow setae, legs otherwise with stronger setae blackish. F 1 with ventral hairs longest on proximal 0.5 where as long as limb is deep. F 2 with ventral fringe hardly as long as limb is deep. F 3 moderately inflated, slightly petiolate basally, widest at 0.7–0.8 from base, viewed laterally lower margin linear, upper margin slightly convex on distal 0.5; ventral spines comprising linear row of ~12 short bristles in front of which are 4–5 stronger bristles which about middle are as long as limb is deep; pv fringe of yellowish hairs weak proximally, becoming stronger and black distally; distinct somewhat curved proclinate bristles anteriorly at 0.6 and 0.8–0.9 from base. T 1 with long yellow ventral bristly hairs 1.5–2.0X long as limb is deep; 1 small dark bristle at 0.5–0.6 from base distinct from other dorsal hairs. T 2 with strong bristles (0.6–0.7X long as limb) dorsally at ~0.4 from base and ventrally at 0.5; 1 slightly shorter av apically. T 3 slightly inflated distally, narrower on proximal 0.5; 1 fine dark bristle dorsally at 0.5; apical circlet with only 1 small av and pv setae conspicuous. MT 1 with rather long hairs ventrally at base, becoming shorter distally. MT 2 with distinct yellow ventrobasal bristle, 0.2–0.3X long as segment. MT 3 with short spine like bristles admixed with yellow hairs ventrally. Wing membrane clear or faintly tinged brown, veins brownish yellow; stigma indistinct, greyish, reaching costa at ~0.9 distance between end of R 1 and R 2+3. Squamae with pale hairs. Halter white. Abdomen subshining brownish black, dusted grey; tergites with long pale bristles on posterior margin, becoming shorter on distal segments; sternites with longish hairs on posterior margin, hardly shorter on distal segments. Terminalia ( Figs 31–33 View FIGURES 31–34 ) black, with black setae; epandrial lamellae globoid; left epandrial lamella ( Fig. 31 View FIGURES 31–34 ) with 2 (sometimes 3) very strong bristles subapically; left surstylus elongate, narrow, with 1 strong and 1 weaker bristles supapically; right surstylus ( Fig. 33 View FIGURES 31–34 ) deeply and narrowly bifurcate; hypandrium ( Fig. 32 View FIGURES 31–34 ) produced distally with tip broadly bilobed. Female. ( Fig. 1 View FIGURES 1–4 ). Similar to male but MT 1 with shorter hairs ventrally. F 3 more distinctly petiolate basally, widest at ~0.8 from base where almost 2X wide as at base. Terminalia ( Fig. 34 View FIGURES 31–34 ) black; sternite 8 not protuberant, more or less triangular (sometimes with anterior part weakly sclerotized and inconspicuous when appearing subquadrate), with only short hairs; tergite 8 with longer setae along margins.

Comment. This species is similar to H. stigmaticus sp. nov. in having legs almost entirely yellow and a bare antennal stylus. However, in that species the stylus is longer, the front tibia and tarsi are darkened, the mid tibia has two very strong dorsal bristles and a strongly marked stigma is present on the wing. There is some variation in morphology of the male terminalia, as there are sometimes 3 rather than 2 stout bristles on the left epandrial lamella and the shape of the apices of both right and left surstyli is also rather variable. Hybos bispinatus sp. nov. has an eastern distribution in Thailand ( Fig. 247 View FIGURES 242–250 ), being known from the Phu Pan, Petchabun and Cardamon mountains and from the Dong Paya Yen—Khao Yai Forest Complex. It is confined to elevations below 780 m in highly seasonal forest biotopes with adults active in May and between July and September during the wet season ( Fig. 286 View FIGURES 283–290 ).


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