Dolichocephala Macquart of Thailand (Diptera: Empididae: Clinocerinae) Author Sinclair, Bradley J. Author Plant, Adrian R. text Zootaxa 2017 2017-11-30 4358 3 551 568 journal article 31264 10.11646/zootaxa.4358.3.9 c0651e3d-6fd0-44c8-986f-264a88eb14df 1175-5326 1068858 2BFB0521-BEFE-41F9-8AD0-3A7E354912A7 Dolichocephala immaculata sp. nov. ( Figs 3 , 19 ) Type material. HOLOTYPE , ♂ labelled: “ THAILAND : Loei Province / Phu Hin Rong Kla Nat. Park/ Huai Man Daeng Noi at trail/ 16°57′N 101°03′E , 1600 m / 14.xi.–14.xii.2002 , Malaise [Coll. CMU Team]”; “ HOLOTYPE / Dolichocephala / immaculata / Sinclair & Plant [red label]” ( QSBG ). PARATYPES : THAILAND . Loei Province : same data as holotype , ( 1 ♂ , CNC ); same data as holotype , 21.x.–18.xi.2002 ( 1 ♀ , CNC ). Additional material. Chiang Mai Province : Doi Inthanon NP , summit marsh, 18°35.361′N 98°29.157′E , 2500 m , MT, 26.x.–2.xi.2006 , Y. Areeluck leg. T380 (1?, QSBG ). Recognition. This species is distinguished by the unspotted wings, absence of auxiliary crossvein between R2+3 and R4 and yellowish brown prosternum. Description (wing length 1.8–1.9 mm ). Male. Head: Slender, tapered ventrally. Clypeus and face with greyish pruinescence, extending dorsally to ocellar triangle; occiput dark brown. Ocellar triangle with pair of stout upturned setae. Antenna dark brown. FIGURES 5–7. Male terminalia of Dolichocephala spp. in Thailand, lateral view. 5. D. longicerca sp. nov. ; 6. D. srisukai sp. nov. ; 7. D. thailandensis sp. nov. Scale bars = 0.1 mm. Abbreviations: cl cerc—clasping cercus; distph—distiphallus; phphallus. Thorax: Scutum dark brown, dull, without stripes. Pleura dark brown with whitish pruinescence; prosternum yellowish brown. Several very minute acrostichals anterior to first dc; 5 dc; 1 pprn; 1 presut spal; 1 upper npl, lower npl very slender, short; 1 pal; 2 sctl subequal in length with prescutellar dc. Laterotergite with several brownish setulae. Legs: Fore coxa and femora yellow; mid and hind coxae yellowish brown; tibiae and tarsi darkening apically. Wing: Narrow; infuscate; single long basal costal seta present; R4 branching acutely from R5, V-shaped; auxiliary crossvein absent; irrorations absent, lacking spots. Halter yellowish. Abdomen: Sclerites brown, shiny, concolourous with thorax. Terminalia ( Fig. 3 ): Hypandrium subtriangular, with 3 lateral setae. Phallus slender, gently arched; distiphallus with pigmented dorsal margin, with membranous sac beneath. Ejaculatory apodeme oval. Epandrium subrectangular, with several long, stout marginal dorsal setae; dorsal margin with sharp edge. Clasping cercus digitiform, strongly curved, longer than epandrium; apex rounded with inner peg-like seta. Cercal plate with 2 long setae. Lobe of subepandrial sclerite slender, extended beyond surstylus and epandrium. Surstylus well separated from epandrium, strongly curved, with round apex. Female. Similar to male. Cercus long, length about 2X basal width. Etymology. The species name is from the Latin immaculata (unspotted, unstained), in reference to the unspotted wings. Distribution. This species is known from moist hill evergreen forest at 2,500 m near the summit of Doi Inthanon (Thanon Thongchai Range) in northern Thailand and from 1,600 m at Phu Hin Rong Kla (Petchabun Range), northeast Thailand ( Fig. 19 ). Remarks. Capture dates between October and December indicate that this species is active during the cold season. The clasping cercus is similar to D. orientalis Yang, Zhu & An , but in the latter species the wing has six distinct white spots ( Yang et al . 2006 , figs 1–3).