Hybos subapicalis, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 69-70

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

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Hybos subapicalis

sp. nov.

Hybos subapicalis View in CoL sp. nov.

( Figs 179–182 View FIGURES 179–182 , 275 View FIGURES 269–277 , 301 View FIGURES 299–306 )

Type material. HOLOTYPE ♂: THAILAND, Chiang Mai Province, Huai Nam Dang National Park , Thung Buatong View Point , 19°17.56'N, 98°36.029'E, 31.viii.–7.ix.2007, Malaise trap [ T5511 ] ( QSBG) GoogleMaps . PARATYPES: 20♂, 7♀, same data as holotype ; 4♂, 1♀, Helipad   GoogleMaps , 19°18.33'N, 98°36.289'E, 30.ix.-7.x.2007: 7♂, 14♀, Chiang Mai Province, Doi Inthanon National Park   GoogleMaps , checkpoint 2, 18°31.559'N, 98°29.941'E, 1700 m, 2–8.vii.2006, 19– 26.x.2006, 26.x.-2.xi.2006, 2–10.xi.2006, 10–17.xi.2006, 12–13.xi.2006, 14–15.xi.2006 ; 1♀, Kew Mae Pan   GoogleMaps , 18°33.163'N, 98°28.8'E, 2200 m, 19–26.x.2006: 6♂, 4♀, Chiang Mai Province, Doi Phahompok National Park, Kiewlom 2/ Montane Forest   GoogleMaps , 20°3.426'N, 99°8.553'E, 2112 m, 28.ix.-4.x.2007, 14–21.x.2007 ; 5♂, 3♀, Kiewlom   GoogleMaps 1/ montane forest, 20°3.549'N, 99°8.552'E, 2174 m, 21–28.iv.2008, 28.ix.-4.x.2007, 14–21.x.2007 ; 1♀, Kiewlom   GoogleMaps , 20°02'25''N, 99°08'55''E, 1921 m, 29.xi.2012 ; 3♂, 2♀, Doi Phaluang   GoogleMaps , 20°1.06'N, 99°9.581'E, 1449 m, 21– 28.ix.2007, 7–14.x.2007 ; 1♀, Mae Fang Hotspring   GoogleMaps , 19°57.961'N, 99°9.355'E, 569 m, 13.vii.2007 ( QSBG and NMWC).

Additional material. 1♂, Lampang Province, Chae Son National Park, Mae Paan   GoogleMaps unit, 18°49.644'N 99°24.711'E, 815 m, 15–21.v.2008 ( NMWC) : 2♂, Chiang Mai Province, Huai Nam Dang National Park , 18 km E Pai , 19.31°N 98.60°E, 1720 m, 22.x.2000 ( MNMG). GoogleMaps

Etymology. Named in reference to the black subapical ring on the posterior femur.

Diagnosis. A distinctive species with entirely yellow legs except for the apical tarsal segments and a blackish subapical ring or spot on the hind femur.

Description. Male: body length 3.2–3.8 mm. Head subshining black dusted greyish; face yellowish with margins black on upper part; occipital setae black, lower occipital setae mostly pale. Antenna greyish black; postpedicel ovate in lateral view, ~2.5X long as wide, without distinct dorsal setae; stylus 4–5X long as postpedicel, bare, apical 0.3–0.4 narrower, paler in certain lights. Mouthparts greyish black, palpus narrow with distinct apical hair. Thorax with ground colour black, pleura slightly paler; postalar callus whitish yellow, scutellum yellowish at extreme base; rather uniformly pale dusted with indications of paler broad median stripe on scutum; acr 2-serial, dc uniserial, not continued across prescutellar area, fine and hair-like but posterior dc strong; a distinct pa; one strong and one weaker npl; a few small setae about and behind postpronotal lobe; a pair of strong sct with smaller hairs on posterior margin of scutellum. Legs yellow; F 3 with blackish subapical mark on anterior and posterior face at ~0.7–0.9 somewhat variable in intensity, sometimes encircling limb completely, often paler dorsally and not continued across ventral surface; T 1 dorsally and T 3 on basal 0.7 sometimes vaguely darkened; tarsi with apical segments blackish. C 1 with 2–3 anteroapical bristles black, coxae otherwise with yellowish setae. F 1 with ventral fringe of yellow hairs at most as long as limb is deep. F 2 with a few distinct hairs anteriorly near base; ventral fringe very weak; apical circlet poorly developed apart from one black anteroapical bristle. F 3 not strongly inflated, widest 0.7–0.8 from base, ventral margin linear, dorsal margin convex in profile; ventral spines black, comprising ~5–6 distinct bristles (some of which are as long as limb is deep) behind which is a rather irregular series of 8–9 shorter bristles on basal 0.7, and (following a short discontinuity), a further 3–4 closely spaced denticle-like setae on apical 0.15; pv fringe discontinuous with ~5 bristles on basal 0.5, 2–3 somewhat longer bristles on distal 0.2, all admixed with fine yellowish hairs; rather proclinate distinct curved black bristles anteriorly at 0.5 and 0.8 from base. T 1 with distinct fine bristle 0.6 from base, otherwise not strongly setose; apical circlet with a long ad, 0.4X long at MT 1. T 2 with very long setae, 0.7X long as limb, dorsally at 0.2 and ventrally at 0.3–0.4 from base; apical circlet of 6–7 bristles, one anterior almost as long as MT 2. T 3 slightly widened apically, a distinct bristle dorsally at 0.5, 2 slightly shorter bristles apically. MT 1 with pv fringe of long fine brownish hairs; a distinct short ventral bristle near base. MT 2 lacking distinct ventrobasal spine. MT 3 short spinose ventrally, apical spine somewhat longer. Wing membrane faintly brownish, very slightly darker about base of cell dm and vein Rs; veins brown. Stigma faint or absent. Squamae with pale fringes. Halter white with darker stem. Abdomen brownish black, slightly paler on vent; hairs pale, longest laterally and ventrally on posterior margins of segments. Terminalia ( Figs 179–182 View FIGURES 179–182 ) large, with right epandrial lamella globose, much larger than left epandrial lamella. Right surstylus ( Figs 179, 182 View FIGURES 179–182 ) very long, with short pointed process basally and longer process which is convex on outer face, concave on inner face. Left surstylus ( Figs 179, 181 View FIGURES 179–182 ) moderately large, conspicuous, with one broad and one pointed process. Hypandrium ( Fig. 180 View FIGURES 179–182 ) very narrow with numerous long bristles; 2 apical digitiform processes, the left one curved inwards. Female. Differing from male as follows. F 3 with subapical dark mark often less strongly developed, sometimes only a darkish spot on anterior face and much weaker spot on posterior face; ventral spines often less numerous, the two rows of ventral spines closer together, or even uniserial; pv fringe with at most 1–2 shorter black bristles on basal 0.5 and 1–2 somewhat longer on distal 0.2, admixed with conspicuous yellow hairs; one curving black bristle anteriorly as 0.8 from base. MT 1 lacking pv fringe of long fine hairs; Abdomen with tergites 7 and 8 deep black, contrasting with proximal segments, all setae yellowish (including terminalia); tergite 8 encircling abdomen, sternite 8 small, shining black. cercus yellowish.

Comment. Hybos subapicalis sp. nov. is mostly restricted to hill evergreen and moist hill evergreen forests on the mountains of northern Thailand in the Daen Lao and Thanon Thongchai ranges and Khun Tan Chain ( Fig. 275 View FIGURES 269–277 ). Although a total of 5 specimens were caught in April, May and July during the early part of the wet season, the species was more abundant at the end of the wet season with 76 (94 %) captured in September and October ( Fig. 301 View FIGURES 299–306 ). H. subapicalis sp. nov. may be closely related to H. medialis Huo, Grootaert & Yang, 2010 from Vietnam and perhaps also H. bicoloripes Saigusa, 1963 from Japan and China as both these species have similarly patterned hind femora and similar femoral chaetotaxy. All three species have an apically bilobed hypandrium, that of H. subapicalis sp. nov. and H. medialis also being exceptionally elongate.


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