Hybos zhejiangensis Yang & Yang. Eight 1995
Creators: name: PLANT, ADRIAN R.
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Hybotidae
Hybos
Hybos zhejiangensis

description: Hybos zhejiangensis Yang & Yang
(Figs 219–227, 239, 282, 306)
Hybos zhejiangensis Yang & Yang, 1995: 237.
Material examined. 3♂, 10♀, THAILAND, Chiang Mai Province, Doi Phahompok National Park, Kiewlom 2/ Montane Forest, 20°3.426'N, 99°8.553'E, 2112 m, 21–28.ix.2007, 28.ix.-4.x.2007, 14–21.x.2007; 3♂, 5♀, Kiewlom 1/montane forest, 20°3.549'N, 99°8.552'E, 2174 m, 21–28.ix.2007, 28.ix.-4.x.2007, 14–21.x.2007; 4♂, 4♀, Mae Fang hot spring, 19°57.961'N, 99°9.355'E, 569 m, 7–14.vi.2008, 13–14.vii.2007; 2♂, Doi Phaluang, 20°1.06'N, 99°9.581'E, 1449 m, 7–14.vi.2008, 13–14.vii.2007 (QSBG and NMWC).
Diagnosis. A black legged species with entirely pale setae on coxae and stylus micropilose on basal 0.8. The mid tibia has 1 dorsal and 1 ventral setae very long; in males the hind femur is slightly inflated but distinctly narrower in females and the hind tibia is rather slender, slightly but distinctly swollen on distal 0.3 in both sexes. Distinguished from H. shamshevi sp. nov., H. phahompokensis sp. nov. and H. inthanonensis sp. nov. primarily by differences of male and female terminalia.
Description. Male: body length 4.0– 4.5 mm. Head subshining black, dusted greyish, more strongly so about mouth edge behind eye; face black, vaguely yellowish black below; postocular occipital setae black becoming pale below and short pale bristles on lower occiput. Antenna black; postpedicel slightly paler, ovate in lateral view, 2.5X long as wide, apparently lacking dorsal seta; stylus 6X long as postpedicel, black, micropilose on proximal 0.8, hairs hardly longer than stylus is deep, apical 0.2 bare. Mouthparts blackish, palpus very narrow, with 1–2 distinct dark hairs apically and another near base. Thorax with ground colour black, subshining; postalar callus laterally, scutellum narrowly at base, pleura vaguely about base of wing and sometimes upper part of anepisternum and anepimeron faintly yellowish; dusted greyish or whitish, more strongly on prescutellar area which has narrow shining median stripe when viewed from above; acr biserial, widely spaced, fine and hair-like; dc uniserial, similar to acr but posterior dc and acr before prescutellar area strong; 2 npl, 1 pa and 2 apical sct with several fine pale marginal hairs. Legs rather slender, dull black, dusted greyish; ‘knees’ of all legs (sometimes also apices of tarsal segments and all trochanters) narrowly and extremely vaguely dark yellowish. Coxae with hairs and bristles pale yellow, especially behind C 3 where conspicuously long and dense. F 1 with ventral fringe of pale hairs longer on basal 0.6 but not as long as limb is deep. F 2 very slightly concave about middle viewed from above; ventral fringe shorter than limb is deep; anterior fringe of fine bristles distinct only on basal 0.2. F 3 rather slender (Fig. 226), weakly inflated, widest 0.5–0.8 from base (where 1.5–2.0X width of tip of T 3); ventral spines comprising 1 av row of 10–11 setae, most of which are conspicuously longer than limb is deep, and 1 similar pv series; pv fringe of short hairs becoming stronger distally, culminating in strong bristles on distal 0.3; 4 strong curved slightly proclinate bristles anteriorly on apical 0.6 and another near tip. T 1 with ventral fringe of pale hairs rather erect, no longer than limb is deep; dorsal fringe darker, rather proclinate, sparser, a much stronger but still fine bristle 2–3X long as limb is deep at 0.5 from base and 1 smaller bristle preapically; 1 very strong apical ad (0.5X length of MT 1) and several much smaller apical setae. T 2 with long proclinate bristles 0.7X long as limb dorsally at 0.3 and ventrally at 0.5 from base; about 6 apical and preapical bristles of different lengths, including 1 apicoventral 0.7X long as MT 2 and 1 rather shorter posterior preapical. T 3 (Fig. 239) slightly but distinctly swollen on distal 0.3 (~1.8X wide at tip as at base), with dorsal hairs as long as limb is deep, 2 strong dorsal bristles 4–5X long as limb is deep near middle; ventral hairs shorter and more numerous, merging into yellowish pile on apical 0.3; 1 strong anterior preapical, as long as anterior and dorsal apicals; apical circlet otherwise weak. MT 1 with 1 strong bristle (0.2X long as segment) near base; and pair of longish fine hairs dorsally before tip of MT 1 and second tarsal segment. MT 2 with 1 strong bristle near base and progressively smaller bristles at 0.5 and near tip. MT 3 with ventral spine-like setae hardly longer than surrounding yellowish pubescence. Wing membrane faintly brownish, 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 brownish black with somewhat bronze reflections, dusted greyish; bristly hairs mostly pale, longest and more numerous laterally and ventrally. Terminalia (Figs 219–223) with dark bristles; left epandrial lamella with rather broad trapezoid subapical process on inner margin, appearing triangular in some views; left surstylus (Figs 221, 222) moderately long, curved, digitiform, blunt-ended; right epandrial lamella with inner margin slightly protuberant; right surstylus (Fig. 219) moderately long, narrow and bluntly pointed viewed from above, much broader viewed from the side (Fig. 223). Hypandrium (Fig. 220) with distinctive short, yellowish subapical process. Female. Similar to male but legs even more vaguely yellowish about ‘knees’. F 3 distinctly less inflated (Fig. 227); ventral spines more or less uniserial, comprising 9–11 setae about as long as limb is deep and 1–2 conspicuously longer bristles 2X long as limb is wide at 0.3 and 0.5 from base; pv fringe longer, becoming stronger distally, entirely yellowish, not culminating in strong bristles on distal 0.3; only 1 (preapical) curved bristle in front. T 3 without strong dorsal bristle 3–4X long as limb is deep at 0.6. MT 2 with 1 strong bristle near base, smaller bristle at tip but median bristle even smaller. Abdomen broader, brownish black; all setae shorter than in male, pale, but darker on posterior margin of tergite 7. Terminalia (Figs 224, 225) quadrate in ventral view, bristles dark; tergite 8 linear or very slightly concave on posterior margin; sternite 8 black, apically narrowed, not at all inflated in lateral view; tergite 8 shining black basally, paler and dusted apically.
Comments. Thailand examples of this species apparently differ from the type material collected at Gutianshan Mountain, Kaihua Co., Zhejiang, China (Yang & Yang 1995) in having more or less entirely black legs (the tibia and basal tarsal segments are yellow to dark yellow in Chinese specimens). There are also small differences in the shape of the surstyli and the subapical hypandrial process which is shorter and broader in Thai material. These differences suggest that there has been divergence between Chinese and Thailand populations of H. zhejiangensis but I do not consider this to be so substantial as to warrant specific status in the absence of more thorough examination of material from hypothetical intervening populations. Hybos zhejiangensis is similar to H. shamshevi sp. nov., H. phahompokensis sp. nov. and H. inthanonensis sp. nov. from which it may be distinguished primarily by differences of male and female terminalia. All Thailand examples of H. zhejiangensis were collected between 569–2,174 m from Doi Phahompok National Park (Daen Lao Range) in the extreme north of Thailand (Fig. 282) in September, October, June and July and the species was most common above 1,400 m in September and October (Fig. 306). In material collected in June and July the blunt central process of the right surstylus is more elongate and the digitiform process of the left stylus is broader than figured here (Figs 221–223) and it is possible that these represent seasonally segregated populations of the species; one occurring early in the wet season at lower altitudes and the other at the end of the wet season at higher elevation.
description: Published as part of PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, pp. 1-98 in Zootaxa 3690 (1) on pages 82-83, DOI: 10.11646/zootaxa.3690.1.1, http://zenodo.org/record/6329811