The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand PLANT, ADRIAN R. Zootaxa 2013 2013-07-17 3690 1 1 98 8CDHX PLANT, 2013 PLANT 2013 [151,398,367,393] Insecta Hybotidae Hybos Animalia Diptera 15 16 Arthropoda species anisoserratus sp. nov.  ( Figs 22–25, 245, 285)   Type material.   HOLOTYPE ♂: THAILAND Nan Province, Doi Phu Kha National Park, Office4, 19°12.562'N, 101°4.93'E,  1374 m,  8–15.ix.2007, Malaise trap, Charoen& Nikom[ T3212] ( QSBG).   PARATYPES: 2♂, 12♀, same data as holotype,  8–15.ix.2007, 1–8.ix.2007, 15–22.ix.2007;  1♂, 1♀, Office3, 19°12.326'N, 101°4.765'E,  1332 m,  22–29.viii.2007;  1♀, Office10, 19°12.557'N, 101°5.041'E,  1380 m,  1–8.xi.2007;  1♀, Office8, 19°12.439'N, 101°4.825'E,  1358 m,  1–8.x.2007, 22–29.x.2007;  1♀, Office15, 19°12.133'N, 101°4.756'E,  1310 m,  1–8.xii.2007;  2♀, Office13, 19°12.605'N, 101°5.074'E,  1371 m,  15–22.xii.2007;  1♂, 2♀, Office9, 19°12.252'N, 101°4.697'E,  1350 m,  15–22.x.2007;  2♀, Office12, 19°12.138'N, 101°4.711'E,  1331 m,  8–15.xi.2007;  1♂, 2♀, Office11, 19°12.458'N, 101°4.866'E,  1359 m,  8–15.xi.2007, 15–22.xi.2007:  8♂, 3♀, Loei Province, Phu Ruea National Park, Hua Dong Tamsun, 17°29.54'N, 101°20.995'E,  1130 m,  19–26.v.2007, 26.v.-2.vi.2007( QSBGand NMWC).   Etymology.The prefix aniso(not equal to) is attached to  serratusto indicate that although superficially similar to  H. serratus, it is not the same species.   Diagnosis.A yellow legged species with only the tip of hind femur and base of hind tibia blackish. The antennal stylus is distinctly subplumose with a bare tip. Both left and right surstyli are narrowly elongate and the hypandrium narrowed distally with apical digitiform process and a shorter blunter rather yellowish process emerging internally. In females, tergite 8 does not encircle the abdomen and sternite 8 is rather weakly sclerotized laterally.   Description. Male: length 2.6–3.4 mm. Headsubshining black; face dark blackish yellow below. Postocular setae black, a few paler hairs on lower occiput. Antenna black, postpedicel ovate in lateral view, ~2.5 X long as wide; stylus ~5X long as postpedicel, black and distinctly subplumose on basal 0.8, bare on distal 0.2. Mouthparts blackish, palpus very narrow, with fine setae apically and ventrally near middle. Thoraxwith ground colour black, postalar callus, scutellum basally and pleura somewhat paler; pleura and scutum (especially about prescutellar area); pollinose; acr biserial, dc uniserial, small, fine but distinct; posterior dc and acr, upper npl (2X long as lower npl), pa and 2 sct distinct, other setae small, hair-like. Legsmostly yellow with F 3on apical 0.1 blackish; T 3variably darker on basal 0.3, clear yellow distally; T 1entirely yellow (occasionally very vaguely darkened), not darker than T 2; all tarsi yellow, becoming slightly darker on distal segments. Coxae with pale hairs and bristles. F 1with erect pv hairs not longer than limb is deep. F 2very 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 3moderately inflated, widest 0.6–0.7 from base; viewed laterally upper margin convex, lower margin almost linear; ventral spines black, rather variable in number and arrangement, usually comprising 7–9 strong bristles (some of which on proximal 0.8 are slightly longer than limb is deep) behind which are ~12–17 mostly shorter, more evenly sized bristles, sometimes with a few extra bristles distributed between or posterior to the two main series; pv fringe with ~3 strong black bristles on distal 0.3, otherwise weakly developed and yellowish; 4–5 rather proclinate distinct curved black anterior proclinate bristles on distal 0.5. T 1with fine but distinct hair dorsally at 0.6 and 1 somewhat longer seta anteroapically in apical circlet, otherwise short-haired.T 2with strong bristles dorsally at ~0.2 and ~0.4–0.5 from base and 1 rather longer bristle ventrally at ~0.5; apical circlet with 1 av bristle much longer than others. T 3somewhat inflated distally, ~1.5–1.8X wide at tip than at base; 1 strong bristle dorsally ~0.5–0.6 from base; apical circlet with 3 distinct bristles. MT 1and MT 2with distinct ventrobasal bristle. MT 2with distinct ventral bristles medially and at tip. Wingmembrane tinged brown, veins brown; stigma distinct, reaching costa at ~0.9 distance between end of R 1and R 2+3. Squamae with pale hairs. Halter white. Abdomensubshining brownish black, tergites with long pale to blackish bristles on posterior margin, becoming shorter on distal segments. Sternites with long hairs on disc, hardly shorter on distal segments. Terminalia ( Figs 22–24) black, with black setae; left epandrial lamella ( Fig. 24) almost trapezoid with two apical processes and long apical bristles; left surstylus elongate, slightly broadened apically; right epandrial lamella subspherical with right surstylus elongate, directed internally ( Fig. 22); hypandrium ( Fig. 23) rather broad, narrowed distally with apical digitiform process and shorter blunter rather yellowish process emerging internally. Female: Similar to male but F 3much less strongly inflated, widest ~0.8–0.9 from base; ventral spines comprising ~9 distinct bristles arranged in a single row; pv fringe weaker; usually only 1–2 distinct anterior proclinate bristlesand a few longish hairs near tip. Abdomal tergites with longish hairs posteriorly on segments 1–3, shorter on distal segments; tergites with sparser long hairs on disc. Terminalia ( Fig. 25) black, tergite 8 not encircling abdomen; sternite 8 slightly protuberant, rather variably sclerotized but with blackish median area becoming broader basally, laterally paler; when viewed ventrally usually with somewhat darker posterior margin.   Comment.  Hybos anisoserratus  sp. nov.is most likely to be confused with  H. serratus Yang & Yang, 1992.  Hybos anisoserratus  sp. nov.however is smaller and usually has more extensively yellow legs than that species. In particular, the front tibia is at most very faintly darkened and obviously no darker than the mid tibia, the hind tibia is extensively clear yellow, becoming darker only near its base. In  H. serratusthe hind tibia varies from more or less entirely clear yellow to diffusely blackish yellow when dark colouration occurs near the tip as well as basally. In  H. anisoserratus  sp. nov.the basal segments of the posterior tarsus are yellow whereas in  H. serratusthey are often (but not always) considerably darkened. The hind femora is somewhat more spinose ventrally in males of  H. anisoserratus  sp. nov.and there is a tendency for there to be three rather than two rows as in  H. serratusalthough the number and position of the larger bristles varies somewhat in both species. The terminalia of both males and females of the two species are very distinctive and afford numerous differential characters.    Hybos anisoserratus  sp. nov.is known only from elevations between  1,100 mand 1,400 mon mountains along the border between Thailandand Laosin the Luang Prabang Range in Nan Provinceand the Petchabun Range in Loei Province( Fig. 245). Adultsoccur mostly from Septemberto Decemberand again in Mayand early Juneconsistent with emergent activity at the start and end of the wet season ( Fig. 285). 3698642560 2007-09-08 2007-09-15 2007-09-08 Malaise trap QSBG Charoen & Nikom Thailand 1374 19.209366 Doi Phu Kha National Park 8 101.08217 15 16 T3212 1 1 Nan Province holotype 3698642307 15 16 paratype 3698642344 15 16 3698642388 [470,1248,582,606] 15 16 3698642411 15 16 3698642463 15 16 3698642516 [308,1065,654,678] 15 16 3698642405 15 16 3698642483 [582,1327,690,714] 15 16 3698642486 15 16 3698642550 15 16