Hybos men, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 43-45

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

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Hybos men

sp. nov.

Hybos men View in CoL sp. nov.

( Figs 104–108 View FIGURES 104–108 , 261 View FIGURES 260–268 )

Type material. HOLOTYPE ♂: THAILAND, Chantaburi Province, Khao Kitchakut National Park , 12°53'09''N, 102°06'40''E, 102 m, 1.vii.2008, netted, A.R. Plant-TIGER Project ( QSBG). GoogleMaps PARATYPES: 2♀, same data as holotype ( QSBG and NMWC). GoogleMaps

Additional material. 1♀, Chantaburi Province, Khao Khitchakut , 21.xii.2007, N. Vikhrev ( ZMMU) ; 1♀, Chanthaburi Province, Hotel Krating Country Resort   GoogleMaps , 12.822623°N, 102.127352°E, 06.ii.2009, A.L. Ozerov ( ZMMU).

Etymology. The species is named from the Thai men (porcupine) in fanciful reference to the strongly setose hypandrium.

Diagnosis. A species with black thorax and all femora black with rather well differentiated yellow apices. The middle tibia is clear yellow and in males has several fine hairs anteroventrally about middle almost as long as a single very long dorsal bristle. The front and hind tibiae are predominantly black. The mid and hind tarsi are mostly yellow but the front tarsi are black. In females, tergite 8 encircles the abdomen and sternite 8 is produced apically into two very short, narrow, rather bristle-like processes.

Description. Male: body length 5 mm. Head subshining black, thinly dusted; postocular setae black, short; setae behind mouth mostly dark; face black, only very vaguely yellowish black below. Antenna dark grey; postpedicel ovate in lateral view, ~2.5X long as wide, lacking dorsal seta; stylus bare, 6–7X long as postpedicel, apical 0.1–0.2 narrower, paler in certain lights. Mouthparts blackish; palpus very narrow, with short distinct seta apically and several medially. Thorax with ground colour black, outer edge of postpronotal lobe very narrowly and postalar callus narrowly yellowish; scutum subshining with whitish blue reflections in some lights, thinly but conspicuously dusted on disc, more strongly so laterally behind postpronotal lobe; pleura more strongly dusted; acr 2–4-serial, dc uniserial, fine, not continued over prescutellar depression; posterior dc larger, bristle-like; 1 strong and 1 weak npl; pa weak; sct with 2 strong marginal bristles and several fine hairs. Legs with coxae black; femora black, apical 0.1 of F 3 sharply demarked clear yellow, apical 0.1–0.2 of F 2 and F 3 slightly less strongly demarked yellow; T 1 black, T 2 yellow with slightly darker base and tip, T 3 black, narrowly but distinctly yellowish apically and especially basally; anterior tarsi black, mid and posterior tarsi yellow with apical 3 segments blackish. Coxae with dark setae, paler behind C 3. F 1 with pv fringe of distinct fine bristles. F 2 with fringe of fine bristles anteriorly, becoming longer basally; pv fringe obviously longer than limb is deep at 0.4–0.6 from base; 1–2 distinct short anteroapicals. F 3 quite strongly and evenly inflated, widest 0.4–0.6 from base; ventral spines black, comprising 1 av series of ~12 strong bristles which are not as long as limb is deep, behind which is 1 series of ~22 much shorter spines and rather numerous fine hairs; pv fringe complete, about as long as limb is deep on distal 0.7–0.9, becoming shorter proximally; distinct rather proclinate slightly curved anterior bristles at 0.6–0.7 and 0.9 from base. T 1 with pv fringe of long hairs, becoming longer distally where almost as long as MT 1. T 2 with strong black bristles 0.3–0.4X long as limb dorsally at 0.15–0.2 and 0.4–0.5 from base; 1 similarly strong ventral bristle at 0.6 and several much finer but almost as long bristles anteroventrally; apical circlet of 5–6 bristles including 1 av 0.6– 0.7X length of MT 2. T 3 not swollen apically, rather thinly covered with longish pubescent hairs and a few longer dorsal setae. Front tarsi with long hairs anteroventrally and posteroventrally on MT 1, becoming shorter distally, and shorter still on second tarsal segment; MT 2 lacking strong basal ventral bristle; MT 3 short spinose ventrally. Wing membrane tinged greyish brown; veins brown; stigma faint, brownish, reaching 0.7X distance between end of R 1 and R 2+3. Squamae with white fringes. Halter white, stem darker. Abdomen subshining brownish black, thinly dusted; somewhat paler ventrally near base; all setae pale, long basally especially at sides, becoming rather darker and shorter distally. Terminalia ( Figs 104–107 View FIGURES 104–108 ) black but hypandrium apically yellowish. Inner margin of left epandrial lamella produced. Right surstylus viewed laterally ( Fig. 106 View FIGURES 104–108 ) broad, anvil-shaped apically. Left surstylus ( Fig. 107 View FIGURES 104–108 ) with large broad appendage and smaller inner dorsal appendage bearing one sharply pointed and one blunter processes. Hypandrium ( Fig. 105 View FIGURES 104–108 ) strongly setose; narrowed and slightly curving distally with two broad apical processes, somewhat incurved. Female. Differing from male as follows. T 1 and especially front tarsi with much shorter av and pv bristles. Abdomen with setae shorter; terminalia with tergite 8 encircling abdomen; sternite 8 produced apically into two small, inconspcuous almost bristle-like narrow processes ( Fig. 108 View FIGURES 104–108 ).

Comment. Hybos men sp. nov. might be confused with H. ancistroides Yang & Yang, 1986 and especially with H. particularis Yang, Yang & Hu, 2002 but may readily be distinguished from them by having much smaller apical processes on sternite 8 of the female and in males by having several long hairs ventrally on the mid tibia almost as long as the very strong bristle near the middle (see further comments under H. ancistroides ). The male terminalia of all three species are distinctive. Hybos men sp. nov. is only known from one lowland forest site in southeast Thailand at Khao Khitchakut ( Fig. 261 View FIGURES 260–268 ), a western outlier of Cambodia’s Cardamom Mountains.


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