Hybos apicihamatus Yang & Yang

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 18

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

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Hybos apicihamatus Yang & Yang


Hybos apicihamatus Yang & Yang View in CoL

( Figs 26–30 View FIGURES 26–30 , 246 View FIGURES 242–250 )

Hybos apicihamatus Yang & Yang, 1995a: 500 View in CoL .

Material examined. 1♂, THAILAND, Chiang Mai Province, Doi Inthanon National Park   GoogleMaps , summit marsh, 18°35.361'N, 98°29.157'E, 2500 m, 15–22.vii.2006 Malaise trap Y. Areeluck [ T70 ]( QSBG).

Diagnosis. An entirely black legged species with pale setae behind posterior coxa and posterior femur strongly inflated. The tibiae and tarsi are thickly covered with long white hairs and the wing is very strongly darkened distal to ends of basal cells.

Description. Male: body length 4.0mm. Head subshining black, dusted greyish; mouth edge narrowly shining; face black, narrowly dark yellowish above mouth. Antenna with scape and pedicel black (postpedicel and stylus missing). Mouthparts blackish, palpus very narrow, hardly widened apically, with ventral hair near base, two medially and one preapicaly similarly sized. Thorax with ground colour black, subshining; postalar callus narrowly yellowish anterolaterally; strongly pale dusted on pleura, rather less so on scutum and scutellum, somewhat brownish dusted in prescutellar area; acr and dc hair-like even posteriorly, minute anteriorly; one strong and one weaker npl; pa weak; scutellum with two long marginal sct and several much smaller hairs. Legs subshining black, greyish dusted. F 1 and F 2 lacking strong setae but with long pale hairs, longest anteroventrally on F 1, anteroventrally and posteroventrally on F 2. F 3 strongly and evenly inflated, widest 0.5 from base, in profile dorsal margin evenly bowed, ventral margin almost linear; rather evenly covered with pale hairs, about as long as sparser black bristles; prominent black bristles anterodorsally 0.5 and 0.8 from base; ventral spines black, arranged in three irregular rows of about 15 similarly sized setae, obviously shorter than limb is deep, with three slightly longer setae slightly in front. Tibiae rather densely covered with long fine pale hairs 5–10X long as limb is deep, shorter dorsally. T 1 with fine dark bristles dorsally at 0.7 and 0.9 from base; no apical circlet of setae. T 2 with fine dark bristles dorsally at 0.1 and 0.4, anteroapically and posteroapically. T 3 lacking strong bristles, a series of short rather stout hairs arising from small ventral tubercles distally. Anterior and mid tarsi with long pale and dark hairs admixed, becoming darker and shorter on distal tarsomeres. MT 3 much stouter than MT 1 and MT 2 and shorter haired; short stout setae ventrally near base, apically and at 0.7 from base; dense short yellow pile posteroventrally (contiguous with a small patch of similar pile at extreme tip of T 3. Wing membrane clear basally, deep brown distal to apex of basal cells, the demarcation very abrupt. Stigma narrow, indistinct, hardly distinguished from surrounding darkened membrane. Squamae with pale fringes. Halter white, base of stem pale brown. Abdomen black, lightly dusted, rather more shining than thorax; hairs white, longest and more numerous laterally. Terminalia ( Figs 26–30 View FIGURES 26–30 ) with a few long apically crinkled yellowish bristles amongst more numerous black ones. Left epandrial lamella rounded in profile with inner margin hardly concave bearing a few strong setae. Left surstylus ( Fig. 28 View FIGURES 26–30 ) moderately long, bifid, dorsal process pointed, shorter than rounded ventral process. Right epandrial lamella rounded with inner margin more or less linear. Right surstylus ( Fig. 30 View FIGURES 26–30 ) with two apical processes appearing digitiform viewed from outside or inside but broader in dorsal aspect (FIGS). Hypandrium ( Fig. 27 View FIGURES 26–30 ) with strongly curving hook-like apical process and adjacent broader lobe. Female. Not examined, but apparently similar to male.

Comment. Hybos apicihamatus was described from 13♂ and 3♀ captured between 1,300 m and 1,500 m on Baishanzu Mountain, Zhejiang, eastern China. The single male specimen reported here from Thailand was taken at 2,500 m on the mountain Doi Inthanon (Thanon Thongchai Range), Chiang Mai Province ( Fig. 246 View FIGURES 242–250 ). It differs from the Chinese specimens in having dorsal setae on the mid tibia, and in having wings very strongly darkened apically. The form of the hypandrium is closely similar in the Thailand and Chinese specimens but the shape of surstyli of the Thailand specimen is slightly different from figures. 173–175 in Yang and Yang (2004). Without opportunity to examine the type material, I refrain from raising the Thai specimen as a new species although the differences noted above might justify at least subspecific status for it. Hybos apicihamatus is distinct from other members of the genus in Thailand with entirely black legs and thorax in having the wing very strongly and abruptly darkened apically and the presence of numerous long white (almost pubescent) hairs on the tibiae and tarsi.














Hybos apicihamatus Yang & Yang


Hybos apicihamatus

Yang, D. & Yang, C. 1995: 500
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