224 Records of the Indian Museum. [Vou eat: 
with a little hoary dust. Sides of thorax blackish, with a little 
greyish dust on upper parts. 
Abdomen.—The Ist segment narrow, 2nd very much contracted 
at base, thence suddenly widened; rich shining deep mahogany 
brown, nearly black, with very sparse and almost microscopic 
whitish hairs, Belly yellow ochre; two small black spots in a 
dorsal line near the base, and a median well marked black line on 
the apical half. 
Legs —Anterior four bright yellow. Hind femora much 
incrassated, yellow, a blackish band in the middle (incomplete 
below), and a complete broad black ring at thetip. Underside with 
two rows of minute black spines; hind tibiae pale vellow, a long 
black streak below at base, and a blackish ring (incomplete on 
upper side) at tip. Hind tarsi brown, their metatarsi distinctly 
thicker than the tibiae, nearly half as long and about as wide as 
rest of tarsi. 
Wings absolutely clear, brilliantly iridescent ; halteres blackish. 
Described from a unique 2 taken by me, 29-v-I0, at Darjiling. 
In the Indian Museum. 
From the small size and very contracted base of the abdomen, 
this species closely resembles an Ascza. 
Sphegina tenuis, mihi, sp. nov. 
@ Darjiling. Long. 44 mm. 
Head.—Frons dull black, with grey dust, ocelli distinct, red ; 
the concavity in profile below the antennae well marked. Anten- 
‘nae black, a little dull grey-dusted, arista very curved; mouth 
parts reddish brown. Occiput grey. 
Thorax black, with yellowish grey dust, and three dersal 
infuscated stripes, the median one the widest, the outer ones 
slightly interrupted at the suture, and not reaching the shoulders. 
A pale grey spot on the latter can be seen if viewed from behind. 
Sides of thorax blackish, with yellowish grey hair. 
Abdomen black, 2nd segment much attenuated and very 
long, 3rd with a broad yellowish sub-basal band. Genital organs 
large, globular apparently. Belly black, greater part of 3rd_ seg- 
ment brownish yellow. 
Legs.—The two first pairs pale yellow with the two last tar- 
sal joints black. Hind coxae black, hind femora considerably 
incrassate; basal half pale yellow, apical half black. Hind tibiae 
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 tibiae. 
Wings yellowish grey, brilliantly iridescent; stigma long, 
brown, halteres brownish yellow. 
Described from one ¢ from Darjiling, taken by me, 29-y-I0. 
In the Indian Museum. 
