Hybos daugeroni, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 23-24

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

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scientific name

Hybos daugeroni

sp. nov.

Hybos daugeroni View in CoL sp. nov.

( Figs 38–44 View FIGURES 38–44 , 249 View FIGURES 242–250 , 288 View FIGURES 283–290 )

Type material. HOLOTYPE ♂: THAILAND, Suphanburi, Province, Pu Toei National Park , Sala Laoda , 14°56.847'N, 99°27.272'E, 560m, 19–25.x.2008, Malaise trap, P. Wangkum [ T3579 ] ( QSBG). GoogleMaps PARATYPES: 2 ♀, same data as holotype, Huai Mongpae   GoogleMaps /red road, 14°56.985'N, 99°26.78'E, 300 m, 8–15.vii.2008, 24–31.vii.2008: 1♂, Lampang Province, Chae Son, Nursery   GoogleMaps , 18°49.939'N, 99°28.126'E, 485 m, 7–14.xi.2007, Malaise trap: 1♂, 3♀, Loei Province, Phu Ruea National Park   GoogleMaps , office, 17°28.826'N, 101°21.33'E, 860 m, 19–26.vii.2006; nature trail, 17°30.74'N, 101°20.65'E, 1353 m, 26.ix.-2.x.2006; Hua Dong   GoogleMaps , 1130 m 17°29.54'N, 101°20.995'E, 12–19.v.2007 ( QSBG and NMWC).

Additional material. 1♂, 3♀, Phetchaburi Province, Kaeng Krachan National Park: above Ban Krang   GoogleMaps substation, 12°47'N, 99°27'E, 279 m, 26.vi.2008 ; Panernthung   GoogleMaps /km27/water pump, 12°49.151'N, 99°22.483'E, 970 m, 26.ix–3.x.2008 ; km33/helipad, 12°50.177'N, 99°20.688'E, 735 m, 8–15.vi.2009, 25.v.-1.vi.2009: 1 ♀, Nakhon Si Thammarat Province, Namtok Yong National Park, Behind   GoogleMaps campground lavatory, 8°10.434'N, 99°44.508'E, 95 m, 12–19.v.2009 ; 1♀, Chiang Mai Province, Doi Chiangdao National Park, Headquarters   GoogleMaps , 19°24.278'N, 98°55.311'E, 491 m, 21–28.viii.2007 ( QSBG and NMWC).

Etymology. The species is named in honour of Christophe Daugeron, a dedicated student of Empidoidea .

Diagnosis. A black legged species with antennal stylus bare, black setae behind hind coxa and hind femur strongly inflated, not at all petiolate basally. The mid femur is somewhat distorted with a slight concavity in front 0.3 from base and there is a strong ventral bristle at base of mid metatarsus. Separated from H. xishuangbannaensis Yang & Yang, 2004 by having the mid tibia with only two strong dorsal bristles; hypandrium apically bifid and female sternite 8 less strongly inflated.

Description. Male: body length 4.2–5.2mm. Head subshining black, dusted greyish; face black, upper half strongly silvery-grey dusted, strongly demarcated from less strongly dusted lower half; clypeus dusted; mouth edge strongly dusted posterolaterally; occipital setae black. Antenna black with postpedicel ovate in lateral view, ~2.5X long as wide, bearing distinct fine dorsal seta; stylus bare, ~5–6 X long as postpedicel, vaguely paler apically. Mouthparts entirely blackish including palpus. Thorax with ground colour black with bluish reflections on pleura in some lights, postalar callus anterolaterally, outer face of postpronotal lobe and small patch in front of root of halter narrowly yellowish; dusted greyish on pleura, slightly more yellowish grey on scutum and scutellum; vague indications of darker dust stripes on scutum anteriorly along line of dc; acr irregularly 4-serial, hair-like, but posterior bristle of outer series stronger; dc uniserial, hair-like, but posterior bristle strong; 1 strong and 1 weak npl; pa moderately strong; scutellum with 2 distinct sct and about 10 fine marginal hairs. Legs subshining black but yellowish on T 3 about geniculation at extreme base and F 3 anteroapically at extreme apex; dusted greyish. Coxae with bristles mostly dark; rather sparse (including C 3 posteriorly) but stronger and bristle-like distally on outer face of C 3 and anteroapically on C 2 and C 3. F 1 with row of fine dark hairs ventrally, as long as limb is deep at 0.3–0.5 from base; 2–3 short dorsal preapical bristles. F 2 slightly twisted and distorted, weakly concave in front ~0.3–0.4 from base; ad series of fine bristles about as long as limb is deep near base, fading beyond 0.5; 4–5 fine bristles ventrally. F 3 strongly and quite evenly inflated, widest 0.5–0.6 from base, rather evenly but sparsely covered with short hairs which are obviously shorter than and not merging with pv series of conspicuous fine hairs which are almost as long as limb is deep 0.7–0.9 from base; 1 ventral row of about 20 short spines adjacent to which is short series of 4 slightly longer pv bristles on basal 0.3 and complete series of 8–9 av bristles which are almost as long as limb is deep; small ad bristles at 0.7 and 0.9. T 1 with 2 fine dorsal bristles more or less distinguished from more numerous dorsal hairs; series of more numerous somewhat longer fine hairs ventrally; 4–5 distinct apical setae with 1 ad and 1 pv equally longest. T 2 slender with 2 strong equally sized dorsal bristles 0.4X long as limb at 0.25 and 0.45 from base, 1 equally strong av bristle at 0.6 and apically, and smaller one at 0.25 from base; 2–3 shorter apical setae. T 3 with only short hairs, lacking distinct bristles; posteroapical patch of yellowish pile continued on MT 3 posteriorly. MT 1 with longish fine hairs below. MT 2 with very strong ventral bristle at base, almost as long as segment. MT 3 short pilose with several very short spine like setae ventrally. Wing membrane faintly darkened; veins brownish, becoming yellowish basally; stigma faint, brownish, long, reaching costa 0.7–0.8 distance between end of R 1 and R 2+3. Squamae with pale fringes. Halter yellowish white, base brownish. Abdomen black, dusted greyish brown, appearing metallic brassy yellow in some lights; bristly hairs pale, longest and more numerous laterally. Terminalia ( Figs 38–43 View FIGURES 38–44 ) with long, black, distinctly crinkled bristles. Left epandrial lamella rounded in profile with inner margin concave. Left surstylus ( Figs 41, 42 View FIGURES 38–44 ) moderately long in profile with short upturned apical ‘beak’. Right epandrial lamella rounded with inner margin concave. Right surstylus ( Fig. 43 View FIGURES 38–44 ) very short, bearing short rounded posterior process and inconspicuous pointed median process. Hypandrium ( Figs 39, 40 View FIGURES 38–44 ) distally narrowed; bifurcate with one short and another longer digitiform apical processes; lacking strong setae. Female. Similar to male. T 1 with 2 fine dorsal bristles hardly distinguished from rather stronger dorsal hairs. T 2 with well developed dorsal bristle at 0.6 from base, rather smaller than those at 0.15 and 0.4. Abdomen slightly petiolate basally; duller, less strongly metallic brassy yellow in some lights; tergites 7 and 8 not paler than preceding segments; terminalia ( Fig. 44 View FIGURES 38–44 ) with sternite 8 hardly inflated, bearing distinct black bristles projecting posteroventrally.

Comment. The male from Kaeng Krachan differs from the holotype male ( Fig. 39 View FIGURES 38–44 ) in having one of the hypandrial apical processes broader ( Fig. 40 View FIGURES 38–44 ) and a less pronounced apical beak on the left surstylus but is otherwise identical. It is excluded from the type series. Hybos daugeroni sp. nov. is similar to H. xishuangbannaensis Yang & Yang, 2004 but has only two strong dorsal bristles on the mid tibia, the hypandrium is apically bifid and female sternite 8 less strongly inflated. Hybos daugeroni sp. nov. is widely distributed but apparently rather uncommon in Thailand, being found in the Daen Lao and Thanon Thongchai ranges of the north, the Tenasserim Hillls in the West and the Nakhon Si Thammarat Range in the south ( Fig. 249 View FIGURES 242–250 ). It also occurs on the mesa sandstone hills in Loei Province in the north-eastern Petchabun Range. It is found at low elevations (95– 1,353 m) and adults are active between May and December, during the wet season ( Fig. 288 View FIGURES 283–290 ).


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