T1ILREVA. 299 



Described from a perfect unique d in the Indian Museum from 

 Shillong, Assam, 5500 to 6400 it., 29.viii-5.ix.1915 (Kemp}. 



A. very beautiful species, unlike any other Indian form; it must 

 bear considerable resemblance to T. fuJva, Mg., of Europe. 



234. Thereva nigella, Wied. 



Thereva niyella, Wiedemann, Auss. Zweifl. i, p. 23:2 (1828). 



$. "Antennae blackish, in certain ligbts whitish. Epistome, 

 beard, and moustache white ; f rons and back of head with a white 

 shimmer. The rather rubbed thorax shows faint traces of stripes ; 

 the side margins broadly whitish. Abdomen with some white 

 hairs on the side margins, the segments hardly whitish. Wings 

 quite clear ; halteres brown, with white knobs. Legs blackish, 

 with short white hairs. Type in Westermann's collection. 

 Tranquebar. Length 4g lines." (Wiedemunn.} 



235. Thereva flavolineata, Brun. 



Thereva jlavolineata, Brunetti, Eec. Ind. Mus. vii, p. 480 (1912). 



Head: frons small, black, with black hairs; ocelli red; eye- 

 facets larger in front ; face grey, with long stiff black hairs above 

 the antennas and with long greyish hairs below them ; antennae 

 black, microscopically grey-dusted; oral orifice reddish yellow; back 

 of head dead grey, with greyish hairs ; vertex and upper border of 

 eyes with black hairs. Thorax dark brown, with two well-separated, 

 moderately wide, chrome-yellow stripes ; dorsum covered with 

 mixed brown and yellow hairs, the former mainly on the darker 

 parts ; sides of thorax blackish grey in front of wings, ashy grey 

 on lower part, with shaggy dirty white hairs in front of and below 

 shoulders, and in front of wing-base; some yellow hairs above 

 insertion of wings. A row of three bristles between the humerus 

 and transverse suture, two supra-alar bristles (others possibly 

 broken off). Scutellum yellowioh, with a brownish basal triangle, 

 dorsum with brown and grey hairs ; two preapical well-separated 

 bristles. Abdomen blackish grey, posterior margins of segments 

 very narrowly yellow, but more widely so on 3rd and 4th : 1st 

 segment wholly, 2nd, 3rd, and 4th wholly (except posteriorly at 

 the sides), 5th at base, black; dorsum of abdomen with black 

 hairs, which are thickest and longest on the black parts; sides 

 with moderately long whitish-yellow hairs ; posterior margins 

 of segments with very short, similarly coloured hairs. Venter 

 bluish grey, posterior margins of segments more broadly yellow, 

 especially on 3rd and 4th segments ; the whole surface with spit 

 white hairs. Genitalia distinct, shining brown, with brownish 

 hairs on upper, and whitish hairs on lower parts. Legs (hind pair 

 wanting): coxas and femora blackish grey, the former with long 

 greyish-white hairs in front; the latter with grey hairs below on 

 proximal half, blacker hairs on discal half ; tibia? reddish yellow, 



