Hybos saenmueangmai, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 55-56

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

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Hybos saenmueangmai

sp. nov.

Hybos saenmueangmai View in CoL sp. nov.

( Figs 137–140 View FIGURES 137–140 , 268 View FIGURES 260–268 , 296 View FIGURES 291–298 )

Type material. HOLOTYPE ♂: THAILAND, Kamphaeng Phet, Mae Wong National Park , Chong Yen , 16°5.212'N, 99°6.576'E, 1306 m, 7–14.i.2008, Malaise trap, C. Piluek [ T6306 ] ( QSBG). GoogleMaps PARATYPES: 31♂, 7♀, same data as holotype, 24.ix.-1.i.2007, 15–22.x.2007, 22–29.x.2007, 29.x.-5.xi.2007, 12–19.xi.2007, 26.xi.- 3.xii.2007, 10–17.xii.2007, 17–24.xii.2007, 24–31.xii.2007, 31.xii.2007 –7.i.2008, 14–21.i.2008, 9–16.vi.2008 ; 4♂, 1♀, pan trap, 7–8.viii.2007, 14–15.x.2007: 2♂, Nakhon Sawan Province, Mae Wong National Park, Tha Ta Saeng   GoogleMaps , 15°55.174'N, 99°19.405'E, 168 m, pan trap, 6–7.x.2007 ( QSBG and NMWC).

Additional material. 1♂, 1♀, Chiang Mai, Doi Inthanon   GoogleMaps , checkpoint 2, 18°31.559'N, 98°29.941'E, 1700 m, Malaise trap, 2–8.vii.2006, 5–12.x.2006 ( NMWC).

Etymology. Named after Saenmueangma, 7 th king on the Mangrai dynasty of Lan-na.

Diagnosis. A black legged species with antennal stylus bare, pale setae behind hind coxa and hind femur strongly inflated, not at all petiolate basally. No strong ventral bristle at base of mid metatarsus. The legs are less strongly bristled than H. merzi sp. nov. and H. saenmueangmai sp. nov. differs from H. khamfui sp. nov. in having a strong ventral bristle about middle of mid tibia, wing with elongate stigma, and in male genitalic characters, especially in the right surstylus being very short with a bluntly pointed apical process.

Description. Male: body length 3.5–4.0 mm. Head subshining black rather thinly dusted greyish, more strongly so behind mouth edge; occipital setae black. Antenna black; postpedicel paler, ovate in lateral view, 2.5X long as wide, apparently lacking dorsal seta; stylus bare, 6X long as postpedicel, black, distal 0.2 narrower appearing whitish in some lights. Mouthparts blackish, palpus very narrow, fine hairs below shorter than fine black ventroapical bristle. Thorax with ground colour black; postalar callus, pleura about base of wing and outer face of postpronotal lobe yellowish; thinly dusted greyish with vague indications of narrow paler stripe on scutum medially; acr regularly biserial, divergent; dc uniserial, shorter than acr excepting posterior bristle-like seta in front of prescutellar depression; 1 strong and 1 weak npl; pa moderately strong; scutellum with 2 distinct sct and several very fine marginal hairs. Legs subshining brownish black, very thinly dusted; mid tarsus and ‘knees’ of all legs distinctly paler, yellowish; posterior tarsus vaguely paler than T 3; T 2 dark, but sometimes noticeably paler than T 1 and T 3. Coxae with hairs and bristles pale especially behind C 3 where moderately strong and whitish yellow, somewhat darker on C 1 anteroapically. F 1 with short pale hairs below not as wide as limb is deep, becoming shorter distally. F 2 with sparse linear rows of pale av and pv hairs, longest medially where rather longer than limb is wide. F 3 moderately and quite evenly inflated, widest 0.6–0.8 from base, rather sparsely covered with pale hairs, 2–5 fine pale bristles anteriorly tending to be yellowish about base of limb, posterior fringe of longish pale hairs, a few fine hairs anterodorsally and 1 smaller dorsal preapical seta; ventral spines black comprising av series of about 7 strong bristles about as long as limb is deep distally, behind which is 1 series of shorter bristles and some much finer longer pale hairs posteroventrally. T 1 with distinct fringe of dark hairs dorsally from which can be distinguished 1 fine bristle, 2X long as limb is deep at 0.7 from base and 1 smaller one at 0.4; av and pv hairs obviously longer than limb is deep on distal 0.7; apical circlet comprising of 1 long dorsal and several small fine hairs. T 2 slender with strong dorsal bristles 0.25–0.3X long as limb at 0.15 and 0.5 from base and 1 equally strong ventral slightly beyond 0.5; apical circlet of fine bristles and 1 stronger apicoventral about 0.5X as long as MT 2. T 3 with rather evenly sized pubescent hairs, only 1 erect dorsal preapical longer; short pilose yellow setulae posteroapically, contiguous with similar pile beneath basal two segments of hind tarsus. MT 2 with basal ventral bristle small, hardly distinguished for other ventral pubescent hairs. MT 3 with ventral spine-like seta very short, no longer than surrounding yellow pubescence. Wing membrane clear; veins brownish yellow, costa darker; stigma faint, brownish yellow, long, reaching costa 0.8 distance between end of R 1 and R 2+3. Squamae with pale fringes. Halter white. Abdomen subshining blackish brown, paler ventrally; all setae white, longest laterally and ventrally, shorter on dorsum. Terminalia ( Figs 137–140 View FIGURES 137–140 ) with left epandrial lamella rather elongate in dorsal view, inner margin concave. Left surstylus ( Figs 139, 140 View FIGURES 137–140 ) quite short, with broad lateral lobe, narrower and apically pointed in dorsal view. Right epandrial lamella concave on inner margin. Right surstylus short, a short bluntly pointed apical process. Hypandrium ( Fig. 138 View FIGURES 137–140 ) broad, dusted apically, shining basally, apically bifid; large apical lobe with long curving bristles; smaller apical lobe with single bristle basal to it. Female. Similar to male but wings faintly brownish. Sternite 8 not strongly inflated, with rather short brownish yellow hairs. Tergite 8 with longer dark bristles apicolaterally.

Comment. Similarities in chaetotaxy of the legs and especially the shape of the hypandrium suggest a close relationship between H. saenmueangmai sp. nov. and H. merzi sp. nov. The species might also be confused with Hybos khamfui sp. nov. and the characters separating H. merzi sp. nov. and Hybos khamfui sp. nov. from H. saenmueangmai sp. nov. are discussed in the species account for Hybos khamfui sp. nov. Hybos saenmueangmai sp. nov. is known only from predominantly evergreen forest types from 1,300 –1,700 m at Mae Wong and Doi Inthanon national parks in northern Thailand ( Fig. 268 View FIGURES 260–268 ). Adult emergence starts in June during the early wet season but peaks in December and early January during the first part of the cool dry season ( Fig. 296 View FIGURES 291–298 ).


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