SPHEGIXA. — SPIIEGINOBACCIIA. Ill 



88. Sphegina tenuis, Brun. 



Sphcfjina tenuis, Eruuetti, Rec. lud. Mus. xi, p. 224 (1915). 



(S . Head : frons dull black, with grey dust, ocelli distinct, red ; 

 the concavity in profile below the antennae well marked. Antennae 

 black, a little dull grey-dusted, arista very curved ; nioutli-parts 

 reddish-bi'own. Occipnt grey. Thorax black, with yellowi.sli- 

 grey dust and three dorsal int'uscated stripes, the median one the 

 widest, the outer ones slightly interrupted at the suture and not 

 reaching the slioulders. A pale grey spot on the latter can be 

 seen it; viewed from beliiud. Sides of thorax blackish, with 

 yellowish-grey hair. Abdomen black, 2nd segment much atteini- 

 ated and very long, 3rd with a broad yellowish sub-basal band. 

 Genital organs large, apparently globular. Venter black, greater 

 part of 3rd segment brownish-yellow. Le(j!i.\ the first two pairs 

 pale yellow with the last two tarsal joints black. Hind coxae 

 black, hind femora considerably incrassate ; basal half pale 

 yellow, apical half black; hind tibiie mainly dark brown, pale at 

 tips, and a narrow band just beyond the middle (which band 

 appears as if in some examples it might be interrupted) ; hind 

 tarsi blackish-brown, the hind metatarsi thickened, but only one- 

 third as long as the tibia?. Wings yellowish-grey, brilliantly 

 iridescent; stigma long, brown; halteres brownish-yellow. 



Length, 4h mm. 



Described from one S from Darjiling, taken by me, 29. v. 1910, 

 and incorrectly recorded as a $ . In the Indian Museum. 



Genus SPHEGINOBACCHA, de Meij. 

 Sphefjinobaccha, de Meijore, Tijd. v. J:]ut. li, p. 327 (1908). 

 Genotype, SpJiegina macropoda. Big. ; by original designation. 



Body -a^vYOw. Basal half of abdomen rather contracted ; 2nd 

 segment the longest, 3rd and 4th rather shorter, subequal. Eyes 

 in (S narrowly separated, in $ parallel on hinder half, wider apart 

 in front. Epistome with small central bump, not produced over 

 mouth. Antenna) moderately long ; 3rd joint rather large, rather 

 longer than broad, rounded ; arista bare. Eyes sparsely pubescent. 

 Humeri comparatively large. Hiiul femora not thickened, spinose 

 below on apical half. On middle of outer side of 1st posterior 

 cell is the stump of a vein projecting inwards; a similar stump 

 projects from the lower side of the cell, near the tip of the discal 

 cell ; 4th vein with a short appendix at its fiexure upward ; outer 

 side of discal cell straight; anterior cross-vein much before middle 

 of discal cell ; 3rd vein nearly straight; aliihc \\ell developed. 



This genus is allied to Ascia and /Sphegina in possessing spinose 

 hind femora, but is distinguished from tliem by the well-deve!oi)ed 

 aluhc, the course of the anterior cross-vein and of the veins at 



