Hybos khamfui, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 32-35

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

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scientific name

Hybos khamfui

sp. nov.

Hybos khamfui View in CoL sp. nov.

( Figs 2 View FIGURES 1–4 , 74–81 View FIGURES 74–81 , 255 View FIGURES 251–259 , 293 View FIGURES 291–298 )

Type material. HOLOTYPE ♂: THAILAND, Chiang Mai Province, Doi Phahompok National Park , Kiewlom2/ Montane Forest, 20°3.426'N 99°8.553'E, 2112 m, 21–28.ix.2007, Malaise trap, P.Wongchai [ T6161 ] ( QSBG). GoogleMaps PARATYPES: 2♂, 2♀, same data as holotype ; 4♂, 10♀, same data as holotype, 14.ix.-21.x.2007, 28.ix.-4.x.2007, 28.x.-4.xi.2007 ; 3♂, 7♀: Doi Phahompok National Park, Kiewlom   GoogleMaps 1/montane forest, 20°3.549'N 99°8.552'E, 2174 m, 28.ix.-4.x.2007, 14–21.x.2007, 21–28.v.2008 ; 2♂, 1♀, Doi Phahompok National Park, Doi Phaluang   GoogleMaps , 20°1.06'N 99°9.581'E, 1449 m, 21–28.ix.2007, 28.x.-4.xi.2007: 9♀, Chiang Mai Province, Doi Inthanon National Park, Checkpoint   GoogleMaps 2, 18°31.559'N 98°29.941'E, 1700 m, 16–24.viii.2006, 5–12.x.2006, 12–19.x.2006, 2–10.xi.2006 ; Kew Mae Pan   GoogleMaps , 18°33.163'N 98°28.8'E, 2200 m, 5–12.x.2006, 12–19.x.2006 ; summit marsh, 18°35.361'N 98°29.157'E, 2500 m, 6–13.ix.2006, 5–12.x.2006, 2–10.xi.2006. ( QSBG and NMWC).

Additional material. 11♂, 19♀ from Doi Phahompok, Doi Inthanon and Doi Chiangdao national parks in Chiang Mai Province and Mae Wong National Park in Khamphaeng Phet Province ( QSBG and NMWC).

Etymology. Named after Khamfu, 4 th king of 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 Hybos khamfui sp. nov. differs from H. saenmueangmai sp. nov. in lacking a strong ventral bristle about middle of the mid tibia, in having a short rounded stigma and in male genitalic characters, especially in the right surstylus being elongate and inwardly curved. Females are distinctive in having sternite 8 enlarged, rounded in profile, with conspicuous long straight golden-yellow bristles.

Description. Male: body length 3.0 mm ( Fig. 2 View FIGURES 1–4 ). Head subshining black dusted greyish; mouth edge shining; face dark reddish yellow to black, usually with darker variably shaped mark narrowly separated from antennal sockets, strongly greyish white dusted; occipital setae black. Antenna black, with postpedicel ovate in lateral view, 2–2.5X long as wide, bearing fine dorsal seta; stylus bare, 4–5X long as postpedicel, black, vague discontinuity on distal 0.25 appearing whitish in some lights (especially viewed from below). Mouthparts blackish, palpus very narrow, fine hairs below not obviously longer than those at tip. Thorax ground colour black, postalar callus anterolaterally, small patch in front of root of halter and sometimes outer face of postpronotal lobe narrowly yellowish; heavily dusted greyish on pleura, greyish brown on scutum and scutellum; vague indications of darker stripes on scutum anteriorly along line of dc. Acrostichals biserial, widely spaced; dc uniserial hair-like, only posterior dc bristle strong; 1 strong and 1 weak npl; pa moderately strong; scutellum with 2 long marginal sct and several much smaller hairs.

Legs subshining black, greyish dusted but T 3 yellowish about geniculation at extreme base. Coxae with hairs and bristles pale especially behind C 3 where moderately strong and clear yellow, somewhat darker on C 2 and C 3 anteroapically. F 1 with row of short pale hairs below becoming shorter distally; 1 short dark dorsal preapical bristle. F 2 with linear rows of av and pv hairs, longest medially where blackish and obviously longer than limb is wide. F 3 strongly and quite evenly inflated, widest 0.5–0.6 from base, rather evenly covered with short pale hairs; 2 prominent black bristles anteriorly 0.5 and 0.8 from base; ventral spines black, arranged in 2 rows (almost triserial basally) comprising 6–8 strong anteriors (not as long as limb is deep) and more numerous but smaller posteriors behind which is a pv row of long pale bristles as long as limb is deep on distal half. T 1 with short dark hairs dorsally from which can be distinguished rather stronger bristles, slightly longer than limb is deep at 0.1, 0.5 and often 0.95 from base; 4–5 distinct apical setae with ad longest; ad ciliation of close-set pile becoming longer and slightly flattened distally; ventral pile quite short, dense, white. T 2 slender, with 2 strong equally sized dorsal bristles 0.25– 0.3X long as limb at 0.2 and 0.5 from base; some short white pilose hairs ventrally; apical circlet of 4 distinct bristles and 1 stronger apicoventral about 0.7X as long as MT 2. T 3 with short hairs dorsally and fine whitish pile ventrally and posteroapically; 1 fine pale dorsal subapical bristle 2X long as limb is deep, and another dorsally immediately beyond basal geniculation. Front tarsus with white ventral pile similar to T 1, otherwise with distinct dark hairs; mid tarsus similar; posterior tarsus with short denticle-like ventral spines on basal two segments, MT 3 with dense short white pile above and below. Wing membrane clear or tinged brown distal to basal cells, paler proximally; veins yellowish to brown, slightly paler basally; stigma distinct, short, reaching costa at about 0.5 distance between end of R 1 and R 2+3. Squamae with pale fringes. Halter white. Abdomen black, lightly dusted greyish, rather more shining than thorax; bristly hairs pale, longest and more numerous laterally. Terminalia ( Figs 74–80 View FIGURES 74–81 ) with long black slightly crinkled bristles. Left epandrial lamella ( Fig. 74 View FIGURES 74–81 ) rounded in profile with inner margin hardly concave and short blunt subapical process. Left surstylus ( Fig. 77 View FIGURES 74–81 ) moderately long, bluntly pointed and subfalcate apically. Right epandrial lamella ( Fig. 75 View FIGURES 74–81 ) rounded with inner margin linear; a short digitiform subapical process appearing longer in lateral view. Right surstylus ( Figs 78–80 View FIGURES 74–81 ) elongate, distinctly curved inwardly, bearing inconspicuous pale linear hairs. Hypandrium ( Fig. 76 View FIGURES 74–81 ) bluntly pointed apically with strong bristles originating from slight swelling subapically, forming more or less continuous line with similar bristles emerging from tip of short rounded process on inner margin. Female. Similar to male but with hairs beneath F 2 rather weaker. F 3 rather less evenly inflated than male, somewhat narrower proximally, widest 0.7–0.8 from base; hairs, bristles and spines similar to male but slightly shorter. Posterior tarsus without short denticle-like ventral spines on basal two segments. Wing more or less uniformly paler, not distally darker. Abdomen with hairs shorter and paler. Sternite 8 enlarged, rounded in profile ( Fig. 81 View FIGURES 74–81 ), with long strong linear yellow bristles projecting posteroventrally; sternite 10 linear, with fine hairs; tergite 10 small, weakly sclerotized.

Comment. There is some degree of variation in the form of the male terminalia of this species; in some individuals, the left surstylus is broader or more strongly bent than indicated in Figures 74 and 77 View FIGURES 74–81 and there is also variation in length of the digitiform subapical process of the right epandrial lamella. While the possibility of undiscovered cryptic species in H. khamfui sp. nov. can not be absolutely discounted, I am satisfied that the observed range of variation is consonant with a single species being involved. Hybos khamfui sp. nov. is similar to H. merzi sp. nov. but the legs of that species are more conspicuously bristled. H. saenmueangmai sp. nov. might also be confused with H. khamfui sp. nov. but it has a strong ventral bristle on the mid tibia and the stigma of the wing is more elongate, quite unlike the short rounded stigma of H. khamfui sp. nov. Hybos khamfui sp. nov. occurs in the Daen Lao and Thanon Thongchai mountains of Chiang Mai Province in the north of Thailand extending southwards as far as the northern part of the Tenasserim Hills in western Kamphaeng Phet Province ( Fig. 255 View FIGURES 251–259 ). Although a few individuals occurred below 1,200 m, 22% of the specimens were collected between 1,300 m and 1,700 m in predominantly Hill Evergreen Forest and the species was especially numerous (74%) above 2,000 m in upper montane Moist Hill Evergreen biotopes near the summits of Thailand’s two highest mountains, Doi Inthanon and Doi Phahompok. Adults have been trapped in all months except February, March, June and December but 80% of all records were from between August and early October ( Fig. 293 View FIGURES 291–298 ), coincident with the wettest part of the rainy season over the species’ known range.


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