Hybos particularis Yang, Yang & Hu

PLANT, ADRIAN R., 2013, <p class = " HeadingRunIn " align = " left "> <strong> The genus <em> Hybos </ em> Meigen (Diptera: Empidoidea: Hybotidae) in Thailand </ strong> </ p>, Zootaxa 3690 (1), pp. 1-98: 50-52

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Hybos particularis Yang, Yang & Hu


Hybos particularis Yang, Yang & Hu  

( Figs 122–125, 265, 294)

Hybos particularis Yang, Yang & Hu, 2002: 734   .

Material examined. 4♂, 1♀, THAILAND, Sakon Nakhon Province, Phu Phan National Park, Behind forest protection unit at Huay Wien Prai , 17°6.863'N, 104°0.327'E, 387 m, 10–17.ii.2007 GoogleMaps   , Malaise trap, Winlon Kongnara; 1♂, North of well, 17°3.543'N, 103°58.452'E, 312m, 5–11.i.2007 GoogleMaps   : 1♂, Nakhon Nayok Province, Khao Yai National Park, Nature trail in secondary moist evergreen forest, 14°24.515’N, 101°22.432’E, 750 m, 6– 7.viii.2006 GoogleMaps   , pan trap: 1♂, Chaiyaphum Province, Pa Hin Ngam National Park , ‘deciduous’, 15°39.966’N, 101°27.198’E, 357 m, 5–6.xii.2006 GoogleMaps   , pan trap; 1♂ 7–8.xii.2006: 3♂, 2♀, Chiang Mai Province, Doi Chiang Dao National Park, Nature Trail , 19°24.278’N, 98°55.311’E, 491 m, 17–24.iii.2008 GoogleMaps   ; 2♂, 8–15.iv.2008; 1♂ 24– 31.iii.2008: 1♂, 1♀, Lampang Province, Chae Son National Park, Nursery , 18°49.939’N, 99°28.126’E, 485 m, 7– 14.xi.2007 GoogleMaps   : 1♂, Phetchaburi Province, Kaeng Krachan National Park, Phanoen Thung Substation , 12°49’25’’N, 99°21’54’’E, 660 m, 27.vi.2008 GoogleMaps   : 2♂, 1♀, Chantaburi Province, Khao Kitchakut National Park, Access track to Buddhas Foot , ~ 100m, 3.vi.2008, ( QSBG and NMWC)   .

Additional material. 12♀ from Doi Chiang Dao National Park, Chiang Mai Province; Khao Kitchakut National Park, Phetchaburi Province; Khuean Srinagarindra National Park , Kanchanaburi Province; Mae Wong National Park , Kamphaeng Phet Province, Doi Phu Kha National Park , Nan Province and from Namtok Yong National Park , Nakhon Si Thammarat Province ( QSBG and NMWC) are tentatively assigned to this species   .

Diagnosis. A species with black thorax and all femora black with rather well differentiated yellow apices. The middle tibia is usually clear yellow with only short hairs ventrally apart from a very strong bristle near middle. 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 long narrow processes.

Description. Male: body length 3.5–3.8 mm. Head subshining black, thinly dusted; upper postocular setae black, short; a few pale setae behind mouth; face yellowish brown. Antenna dark grey; postpedicel ovate in lateral view, ~2.5X long as wide, lacking dorsal seta; stylus bare, 6–7X long as postpedicel, apical 0.15–0.2 narrower, paler in certain lights. Mouthparts brownish black, palpus very narrow, with short distinct seta apically and at 0.5 from base. Thorax with ground colour black, outer edge of postpronotal lobe and postalar callus very narrowly yellowish; scutum shining or very thinly dusted on disc, lightly dusted laterally and on prescutellar depression; 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 (intensity and extent of yellow colour rather variable); T 1 black, T 2 usually yellow with somewhat darker base and tip; occasionally much darker, yellowish black, T 3 black, becoming yellowish at base and tip; mid and posterior tarsi yellow, apical segments usually somewhat darker; anterior tarsi black throughout. Coxae with dark setae, paler behind C 3. F 1 with pv fringe of distinct fine bristles, otherwise without strong setae. F 2 with fringes of similarly fine bristles anteriorly and posteroventrally, at least on basal 0.6, and 1–2 distinct short anteroapicals. F 3 quite strongly inflated, rather narrow basally, widest 0.5–0.6 from base; ventral spines black, comprising av series of 8–11 strong bristles which are not as long as limb is deep, behind which is linear series of 18–21 much shorter spines and rather numerous fine hairs; pv fringe complete, becoming shorter proximally, longest ~0.8 from base where as long or slightly longer than limb is deep; 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, often with 1–2 similarly long hairs on basal 0.5. 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 0.7; apical circlet of 5–6 bristles including 1 av 0.5–0.6X length of MT 2. T 3 not swollen apically, rather thinly covered with longish pubescent hairs. Front tarsi with series of 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, sometimes darker; veins brown; stigma usually 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, becoming rather darker distally. Terminalia ( Figs 122–125) black; inner margin of left epandrial lamella more or less linear ( Fig. 122). Right surstylus viewed laterally bilobed apically ( Fig. 124). Left surstylus ( Fig. 125) with long curved apical process and several smaller subtriangular processes proximally. Hypandrium ( Fig. 123) with two pointed apical processes and fan of strong bristles. Female. Differing from male as follows. T 1 and especially front tarsi with much shorter av and pv bristles. Abdomen more strongly dusted dorsally, all setae shorter; terminalia with tergite 8 encircling abdomen; sternite 8 produced apically into two narrow processes which are slightly reflexed ventrally near apex (similar to H. ancistroides   , Figs 17, 18).

Comment. Hybos particularis   is very similar and undoubtedly closely related to H. ancistroides   . Hybos particularis   usually has more extensive yellow apically on the mid and front femur whereas those of H. ancistroides   are only very narrowly yellowish. Although the mid tibia of H. particularis   is usually clear yellow, it can be darker in some individuals and thus approaches the condition in H. ancistroides   where the limb is more or less entirely black. The male terminalia of the two species are however, very different. Dark females of H. particularis   and H. ancistroides   may be difficult to separate and their terminalia are very similar with tergite 8 encircling the abdomen and sternite 8 with two long apical processes. Hybos men   sp. nov. is also very similar to H. ancistroides   and especially H. particularis   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 females listed under Additional material are only tentatively assigned to H. particularis   .

Described originally from Hainan Island , China ( Yang et al. 2002), H. particularis   is evidently widely distributed in Thailand ( Fig. 265), including the western mountains throughout their length, the southeast, and the Isaan plateau in the east. Although occurring up to 1,306 m all but 6 of the 36 known specimens were collected at or below 750 m in seasonally dry forest biotopes. Adults have been found in all months of the year ( Fig. 294) with indications of peak activity between December and March and again in June and July   .


National Museum of Wales














Hybos particularis Yang, Yang & Hu


Hybos particularis

Yang, D. & Yang, C. & Hu, X. 2002: 734