New species of Hemerodromia Meigen (Diptera: Empididae: Hemerodromiinae) associated with limestone karstic waters in Thailand Plant, Adrian R. Zootaxa 2020 2020-03-31 4758 3 549 560 8GT8P Plant, 2020 Plant 2020 [151,493,225,252] Insecta Empididae Hemerodromia Animalia Diptera 2 551 Arthropoda species aliaexstriata sp. nov.  ( Figs 1–2, 12)   Diagnosis.A predominantly orange yellow species with a dark median stripe on the scutum becoming wider posteriorly, a yellow scutellum and with dark marks between the front coxae and on the katepisternum. The male cercus is broad in lateral view with bluntly pointed dorsoapical and ventroapical processes and the epandrium is narrow and elongate, extending beyond the tip of the cercus.   Description. Male:body length 2.6 mm; wing length 2.0 mm. Head.Rather elongate, ~1.5X long as wide; upper occiput slightly bulging, making smooth angle where meeting vertex. Black with paler dusting. Antenna and mouthparts whitish. One pair of minute reclinate ocellar setulae; 3–4 pairs of minute vertical setulae only about as long as ocellars. Antenna with postpedicel ~1.8–2.0X long as wide, stylus somewhat shorter. Thorax.Not quadrate anteriorly; anterior margin of scutum gradually curving in lateral view. Ground colour orange yellow; scutum with median brownish black stripe, narrow anteriorly, becoming as wide as base of scutellum posteriorly; mediotergite broadly darkened medially; strong black mark between insertion points of front coxae and another smaller oblique mark on katepisternum; small dark marks also present immediately in front of base of wing, obliquely about prothoracic spiracle and on sutures of laterotergite. All setae whitish yellow, minute; notopleural setulae present but very small, scutellars apparently absent. Legs.Yellowish, distal tarsal segments somewhat darkened. C1~1.1X long as distance between base of C1 and C2. F1 hardly longer than C1, ~4.0X long as wide, strongly and evenly inflated, slightly constricted on proximal 0.2; femoral formula ~ 6–8/22–25/21–24/5–6, denticles black, rows converging apically; spines yellow except 1–2 near base black. T1 ~ 0.7X long as F1; evenly curved, ventral face shallowly concave, with 2 rows of ~20 sharply pointed spinose setae ventrally; ventroapical spur weakly developed; distinct ventroapical erect black spinose seta present. Mid and hind legs slender with only small setulae. Wing.Membrane darkened by greyish microtrichia on distal 0.9, paler about base of wing. Veins greyish black, R 4+5darker still. Veins C and R 1yellowish at extreme base. Marginal setulae dark. R 2+3almost linear, joining C ~0.8–0.9X distance between ends of R 1and R 4. Length of C between ends of R 2+3and R 4about as long as R 4. R 4slightly S-shaped. R 5~ 2.0X long as R 4, almost linear. R 4+5fork distal to M 1+2fork by ~ 1.3X length of R 4. M 1almost linear, slightly convergent with R 5, becoming parallel at extreme tip. Cell bm+dm short, ending at tip of R 1. Halter yellowish white. Abdomen.Black dorsally, paler ventrally, tergites 1 and 2 yellowish. Terminalia.Black with dark setae. Cercus ( Figs 1–2) short, not extending beyond tip of epandrium; rather broad in lateral view with short bluntly pointed dorsoapical process and longer ventroapical process; outer surface with fine black hairs. Epandrium long and narrow with fine black hairs ( Fig. 1). Hypandrium small, strongly arched, bare. Phallus with pair of apical hook-like processes. Female:similar to male but scutum with median stripe somewhat narrower anteriorly and abdomen yellowish ventrally. Tip of abdomen truncate, terminalia rather short, hardly extensible and not at all ovipositor-like.   Type material.   HOLOTYPE ♂: THAILAND, Mae Hong Son Province, river near Susawaterfall,  306 m, 19.47797°N, 98.12089°E,  3.iv.2019, netted A. R. Plant ( QSBG).   PARATYPES: 2♀, same data as holotype ( QSBG);  1♂, 3♀, Mae Hong Son Province, Susawaterfall, tufa cliff at confluence of tufa str. and river,  305 m, 19.47457°N, 98.12421°E,  3.iv.2019, netted A. R.  Plant( QSBG).   Etymology.The specific epithet is a concatenation of the Latin alia exmeaning ‘different from’ and striatain reference to this species not being identical with H. striataYang & Yang. It is used as a noun in apposition.   Remarks.The markings on the scutum of this species somewhat resemble those of H. acutataGrootaert, Yang & Saigusa (in which the width and intensity of the median dark stripe varies greatly) or even H. systoechonPlant (in which the dark scutal marking is usually very broad with diffuse edges) from which it may readily be separated by the male terminalia. A generally similarly broad cercus with bluntly pointed dorsoapical and ventroapical processes suggests close affinities with two extralimital species,  H. oratoria(Fallén)(Holarctic distribution), and H. striataYang & Yang from the eastern Palaearctic ( China, Beijing). The latter species also has an elongate epandrium.  Hemerodromia aliaexstriata  sp. nov.is known from a calcareous river in the extreme northwest of Thailand( Fig. 12). 2592946211 2019-04-03 R, QSBG Thailand 306 19.47797 Susa 1 98.12089 3 552 1 1 Mae Hong Son holotype 2592946214 [862,1432,188,215] 2019-04-03 QSBG Thailand 306 19.47797 Susa 1 98.12089 3 552 2 2 Mae Hong Son paratype 2592946220 2019-04-03 R Thailand 305 19.47457 Susa 1 98.12421 3 552 4 3 1 Mae Hong Son paratype 2592946208 [550,712,261,287] QSBG Thailand Plant 3 552 1 Mae Hong Son paratype