Hybos longus Yang & Yang

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 39-40

publication ID	https://doi.org/ 10.11646/zootaxa.3690.1.1
publication LSID	lsid:zoobank.org:pub:0874D336-BA8C-4266-AA50-633167C816F3
DOI	https://doi.org/10.5281/zenodo.6329969
persistent identifier	https://treatment.plazi.org/id/03D787D0-FFED-FFFA-FF05-FE21FD6DF9AE
treatment provided by	Felipe
scientific name	Hybos longus Yang & Yang
status

Treatment

Hybos longus Yang & Yang View in CoL

( Figs 92–96 View FIGURES 92–96 , 258 View FIGURES 251–259 )

Hybos longus Yang & Yang, 2004: 188 View in CoL .

Material examined. 2♂, THAILAND, Chiang Mai Province, Doi Phahompok National Park, Kiewlom GoogleMaps 1/montane forest, 20°3.549'N, 99°8.552'E, 2175 m, 7–14.iv.2008, 28.iv–7.v.2008 ; 1♀, Doi Phaluang GoogleMaps , 20°1.06'N 99°9.581'E, 1449 m, 28.iv.-7.v.2008 ( QSBG and NMWC).

Diagnosis. A species with entirely black legs and black bristles on all coxae and bare stylus distinguished by it large size (body ~ 7–8 mm) and mid tibia with apical circlet of strong bristles incomplete, dorsal setae absent, bristles thus appearing clustered below tip. Male front first and second tarsal segments with very long hairs.

Description. Male: body length 7–8 mm. Head subshining black dusted greyish, more strongly so about mouth edge behind eye; face dark reddish yellow below. Antenna black, postpedicel ovate in lateral view, short, 1.5X long as wide; stylus bare, 6–7X long as postpedicel, black, vague discontinuity on distal 0.05 appearing paler in some lights. Lower occipital seate rather long. Mouthparts blackish, palpus very narrow with short fine bristles. Thorax with ground colour black, postpronotal lobe posterolaterally and postalar callus anteriorly yellowish; scutum strongly brownish dusted with paler brownish stripes along line of acr and medially in some lights; pleura uniformly dusted grey. Acr biserial, dc uniserial; posterior dc, acr, pa and 1 npl strong; postponotal lobe with 1 short, fine, incurved bristle and smaller hairs; 2 marginal sct, rather widely spaced; other dorsal setae small, hairlike. Legs subshining black; only extreme apex of F 3 below and extreme base of T 3 dark yellow. Coxae with black hairs and bristles. F 1 somewhat inflated, widest 0.3 from base, narrowing gradually beyond; almost bare above and behind, pv hairs longer than limb is deep on distal 0.5. F 2 almost bare above, ad ciliation of 6–7 strong short bristles; ventral hairs longest basally, not as long as limb is deep. F 3 strongly inflated, widest 0.4–0.7 from base, rather evenly covered with short dark hairs, numerous pv hairs and bristles longest and strongest basally becoming shorter and hair-like distally, 4 strong bristles anteriorly on distal 0.6; ventral armature comprising 2 rows of ~18 evenly sized and spaced short spines in front of which are ~10 longer bristles, pv fringe of long bristly hairs as long as limb is deep distally, becoming much shorter proximally. T 1 with short dark hairs dorsally, 1 at 0.6 from base stronger; ventral hairs 2–3X long as limb is deep on distal 0.2; apical circlet of short bristles with 1 strong dorsally. T 2 with distinct bristles dorsally at 0.15, 0.4 and 0.6 from base and anteroventrally at 0.5 and 0.7; apical circlet of 6–7 strong bristles incomplete, dorsal setae absent, bristles thus appearing clustered below tip. T 3 with fine erect dorsal subapical hair, otherwise short-haired; patch of yellowish brown pile posteroapically. Front tarsi with pv and av hairs, 0.7X long as segment on MT 1 basally, becoming shorter distally and on second segment. MT 2 with very strong ventrobasal bristle ~0.7X length of segment; MT 3 with short yellowish pile posteriorly. A short bristle dorsoapically on MT 2, tarsi otherwise with only fine dorsoapical hairs but apical segment on all legs with rather conspicuous dorsoapical fringe of ~6 fine long hairs. Wing membrane hyaline or tinged brown, veins brown; stigma distinct, reaching costa at 0.7–0.8 distance between end of R 1 and R 2+3. Squamae with pale fringes. Halter with knob white, base vaguely darker. Abdomen subshining brownish black, duller than thorax, strongly and uniformly dusted, tergites with faintly silvery bronze reflections, bristly hairs pale, longest and more numerous laterally and marginally on tergites 1–3; sternites 6–7 with pale hairs ventrally; sternite 8 with stronger, erect, darker bristles on posterior margin. Terminalia ( Figs 92–95 View FIGURES 92–96 ) externally mostly blackish, hypandrium paler apically. Epandrial lamellae rather narrow viewed dorsally, wider viewed laterally, with numerous black bristles distally. Right surstylus ( Fig. 94 View FIGURES 92–96 ) with two digitiform apical processes and another much broader. Left surstylus ( Fig. 95 View FIGURES 92–96 ) with two broad and one smaller truncated lobes. Hypandrium ( Fig. 93 View FIGURES 92–96 ) narrow, with two narrow and one broader apical lobes. Female. Similar to male but postpedicel longer, 2X long as wide. T 1 and front tarsi without very long hairs below and T 2 with only 1 strong bristle ventrally at 0.7 from base. F 3 with anterior bristles hardly differentiated from surrounding hairs. Abdomen with posterior margins of distal tergites paler; pale outstanding hairs on sternites becoming longer on distal segments. Terminalia ( Fig. 96 View FIGURES 92–96 ) with sternite 8 slightly inflated, bearing numerous mostly dark outstanding bristles.

Comment. Hybos longus Yang & Yang, 2004 resembles most closely H. meeamnat sp. nov. H. paknok sp. nov., H. daugeroni sp. nov. and H. xishuangbannaensis Yang & Yang, 2004 and the differences between them are discussed in the species account for H. meeamnat sp. nov. Hybos longus sp. nov. was described from material collected in May, July and August between 1,800 m and 2,000 m at Emeishan, Sichuan, China. In Thailand it is only known from 1,449 –2,174 m on the mountain Doi Phahomphok in the Daen Lao Range along the border with Burma ( Myanmar) in northern Thailand ( Fig. 258 View FIGURES 251–259 ) where capture dates in April to early May suggest adult emergence coincides with the onset of the wet season.