100 LEPTIDJE. 



stigma small, brownish ; 4th posterior cell closed distinctly but 

 shortly before wing-border ; halteres brownish yellow. 



Length, 11 mm. 



Described from a unique perfect $ in the Indian Museum, from 

 above Tura, Garo Hills, Assam, 3900 ft., viii. 1917 (Kemp). 



Family LEPTID^E. 



Head semicircular, short, rather flattened in front, as broad as 

 or narrower than thorax ; frons at vertex nearly level with the 

 eyes ; face short, " usually with a socketed middle part (epistoma) 

 on which there is usually a rounded raised tubercle " ( Verrall) ; 

 cheeks more conspicuous in some genera than others. Eyes bare 

 (except in one non-Indian genus Coznomyia and in Coenomyiodcs, 

 gen. nov.) ; contiguous or subcontiguous in <3 , distinctly, some- 

 times widely separated in the $ ; in a few cases the frons of 

 about equal width in both sexes ; upper facets in d often much 

 larger than lower ones ; the eyes in life in some species brilliant 

 green ; three ocelli. Proboscis generally robust, sometimes very 

 large, though short ; labella prominent ; palpi moderately long, 

 slender. Antenna? very variable; in the typical LEPTID^ with 

 3rd joint simple, short-conical, round, or renJform, with a bristle 

 or style which is usually terminal, but in some genera is dorsal ; * 

 third joint flagelliform and annulated in XYLOPHAGIX^E. Thorax 

 a little longer than the head, roughly oval or oblong, with rounded 

 corners, generally widest at the middle ; scutellum moderately 

 large, rounded or semicircular ; metanotum larger and more con- 

 spicuous in XYLOPHAGIN.E than in most LEPTIN^. Abdomen 

 7-segmented, elongate or conical, longest and nearly cylindrical in 

 some d XYLOPHAGIN.E. Leys rather long and slender, often 

 minutely bristly on the tibiae or below the femora ; front coxa) 

 rather elongate ; fore tibiae with or without a single spur, middle 

 tibiae always with two spurs, hind tibiae always with one or two 

 spurs, exceptions being rare ; pulvilli three, empoclium pad-like. 

 Wings glabrous, but minutely pubescent under high microscopic 

 power, somewhat broad, with more or less rounded tips. Auxiliary 

 and 1st longitudinal vein somewhat approximate, always ending 

 beyond middle of wing ; '2nd longitudinal beginning at from one- 

 third to one-half the length of the wing, ending not far beyond 

 tip of 1st, often dipped towards tip to embrace the generally 

 obvious stigma ; 3rd vein begins a little beyond the 2nd, (almost 

 always) practically in a line with the base of the discal cell ; 

 always forked, the fork varying in length f and in width of 



* Williston figures the antenna* of Atherix with the arista absolutely basal ; 

 Verrall evidently claims the most distant point horizontally as the true tip 

 and considers the 3rd joint produced downwards. Most authors, I believe, 

 regard as the tip the extremity of its greatest length, as I do here ; it can be 

 accepted either way, but misunderstandings may arise. 



t It is long and narrow in 8tfmphonrmyia,sund short and wide open in 

 Hilarimorphu, neither of these genera being Oriental. 



