Hybos paknok, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 49

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

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scientific name

Hybos paknok

sp. nov.

Hybos paknok View in CoL sp. nov.

( Figs 118–121 View FIGURES 118–121 , 264 View FIGURES 260–268 )

Type material. HOLOTYPE ♂: THAILAND Nakhon Si Thammarat Province, Namtok Yong National Park , TV aerial, 8°14.262'N 99°48.289'E, 966 m, 1–8.ix.2008, Malaise trap, Paiboon leg. [ T3538 ] ( QSBG). GoogleMaps

Etymology. From Thai bpak = beak and nok = bird, in reference to the beak-shaped left surstylus.

Diagnosis. An entirely black legged species with antennal stylus bare, black setae behind posterior coxa and hind femur strongly inflated. Front tibia and metatarsus with numerous long fine bristles ventrally and mid metatarsus with a strong basoventral bristle.

Description. Male: body length 4.5 mm. Head subshining black, dusted greyish; face slightly paler reddish black below, small patch posterolateral to mouth edge more strongly dusted brownish; occipital setae black. Antenna black, with postpedicel ovate in lateral view, 2.5X long as wide, with distinct fine dorsal seta; stylus bare, 4–5X long as postpedicel, hardly paler apically. Mouthparts blackish, palpus very narrow, with fine hairs below medially longer than those at tip. Thorax with ground colour black, subshining; postpronotal lobe obscurely and minutely yellowish behind; dusted greyish on pleura, brownish grey on mesonotum especially on scutellum and lateral margins of scutum; posterior acr and dc (at front of prescutellar depression) strong, otherwise hair-like; 2 npl, 1 pa distinct; 2 small sa, a few similar hairs on and behind postpronotal lobe. Legs subshining black, greyish dusted; extreme tip of femora ventrally, and geniculate base of tibiae narrowly dark yellowish. Coxae entirely with dark setae, posterior face of C 3 with about 10 erect hairs almost as long as limb is deep. F 1 and F 2 with pv hairs as long as limb is deep on basal 0.5, shorter distally. F 2 slightly distorted, weakly concave in front about 0.3 from base where ad series of fine bristles almost as long as limb is deep. F 3 strongly and evenly inflated, widest 0.5 from base, dorsal and ventral margins equally convex in profile; rather evenly covered with fine hairs from which can be distinguished 3 distinct bristles anteriorly and pv fringe of dark hairs becoming longer and bristle-like distally; ventral spines partly obscured by reflexed tibiae in holotype but apparently consisting of av series of evenly sized strong spines behind which are 1 (two near base) row of shorter spines. T 1 with 3–4 distinct bristly hairs and rather more numerous finer hairs dorsally; ventral hairs more erect, finer and longer, including 4–5 ≥ 5X longer than limb is deep. T 2 with strong bristles ventrally at 0.25 and 0.5 and slightly shorter ones at 0.7 and 0.9 from base, similarly strong bristles ventrally at 0.4 and 0.7; apical circlet of 6–7 distinct bristles including av about as long as ventrobasal bristle on MT 2. T 3 with fine hairs, rather longer and semi-erect dorsally, without distinct bristles; small patch of yellowish pile posteroapically. MT 1 with rows of fine hairs anteriorly, posteriorly and ventrally, some ~0.5X long as segment. MT 2 with ventrobasal bristle 0.6–0.7X length of segment, series of 5–6 very fine hairs posteroventrally and anteroventrally with surrounding shorter hairs. MT 3 much stouter than anterior and mid metatarsi, shorter haired, a few small stout black spies ventrally; with dense yellowish pile, strongest posteriorly. Wing membrane tinged brown, slightly darker anteriorly. Veins yellowish brown. Stigma distinct, yellowish brown, long, reaching costa 0.7–0.8 distance between end of R 1 and R 2+3. Squamae with pale fringes. Halter with knob white, stem and base brownish. Abdomen black, rather paler than thorax; tergites strongly dusted, subshining, with faintly bronze reflections; bristly hairs pale, longest and more numerous laterally on tergites and on distal sternites. Terminalia ( Figs 118–121 View FIGURES 118–121 ) with left epandrial lamella black, inner margin concave, subtriangular in lateral view ( Fig. 119 View FIGURES 118–121 ), subapical bristles strong. Left surstylus strongly sclerotized, black, basal process somewhat beakshaped ventrally, apical process digitiform, bearing short spine and several short bristles on inner face. Right epandrial lamella rounded with inner margin concave, subapical setae rather short. Right surstylus ( Fig. 121 View FIGURES 118–121 ) strongly sclerotized, black; trilobed, dorsal lobe rounded with minute setae, other lobes apically pointed. Hypandrium ( Fig. 120 View FIGURES 118–121 ) dark brown, shallowly trilobed apically, setae rather short. Female. Unknown.

Comment. Hybos paknok sp. nov. is only known from the holotype male collected in Namtok Yong National Park in the Nakhon Si Thammarat Range, southern peninsular Thailand ( Fig. 264 View FIGURES 260–268 ). In having entirely black legs, hind coxa with dark hairs and stylus entirely bare, H. paknok sp. nov. resembles most closely H. longus Yang & Yang, 2004 , H. meeamnat sp. nov., H. daugeroni sp. nov. and H. xishuangbannaensis Yang & Yang, 2004 . Hybos paknok sp. nov. may most readily be separated from males of these other species by its having conspicuously long fine bristles beneath the front tibia.













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