CLASTOBASIS. 95 



Thorax ovate, highly arched, hairy ; lateral border setiferous ; 

 scutellum lunate, setiferous ; metanotum large, acclivous. Abdo- 

 men of the female seven-segmented, narrowed at the base and 

 towards the extremity ; ovipositor short, thick, inconspicuous. 

 Legs long and slender ; intermediate and hind femora moderately 

 broad ; tibiae spurred, and with lateral spines ; fore pair with some 

 minute spines along the outer side ; intermediate pair with two 

 sparse rows of long spines on the outer and some very small 

 spines on the inner side ; hind pair with two sparse rows of very 

 long spines and -a row of very short spines on the outer side ; in 

 the hind legs the tibiae and tarsi of about equal length. Wings a 

 little longer than ihe entire body, moderately broad, with rounded- 

 off base, microscopically pubescent. Costal vein ending at tip of 

 3rd vein, some distance before tip of wing ; the auxiliary vein 

 moderately long, ending free and indistinctly, not turning either 

 up or down. The 1st longitudinal vein only of moderate length, 

 ending at middle of wing ; the 3rd beginning at about the middle 

 of the wing near the tip of the 1st, and at a right angle, giving 

 the appearance of a cross-vein. The 4th vein forked about the 

 middle of the wing, soon after contact with the anterior cross- 

 vein, which is long, very oblique, and in a line with the main 

 portion of the 3rd vein ; 5th vein forked near base, the upper- 

 branch interrupted at its base ; 6th and 7th veins incomplete, the 

 former long, the latter very short. 



Range. Only one species previously known, C. tryonii, Skuse, 

 from Australia ; Assam. 



48. Clastobasis vittigera, sp. nov. 



$ . Head wholly bright yellow. Vertex high, flat ; frons perpen- 

 dicular, pointed in front. Antennae with short greyish pubescence ; 

 yes microscopically pubescent, mid ocellus absent, lateral ones 

 very large and conspicuous. A row of eight or nine yellow, curved 

 bristles behind each eye, and four long yellow ones behind vertex, 

 curving slightly backwards ; a few on the trons. Thorax wholly 

 bright brownish yellow. A few stiff bristly yellow hairs laterally, 

 but no obvious chastotaxy. (Scutellum and metanotum destroyed 

 by pin.) Abdomen yellowish ; a dark brown band on posterior 

 part of each segment, broadest in the middle, nearly covering the 

 dorsum of the 5th and 6th. Grenitalia inconspicuous. Legs 

 wholly bright yellow ; tarsi barely darker. Wings yellowish ; a 

 slight brownish yellow suffusion on the disc towards tip; 4th and 

 5th longitudinal veins not quite reaching margin. Halteres 

 yellow. 



Length 3 millim. 



Described from a single male from Sadiya, N.E. Assam, in the 

 Indian Museum. 



There is no reasonable doubt of the species belonging to Clasto- 

 basis, the only discrepancy, compared with Skuse's description, 

 being the absence of the middle ocellus. It agrees perfectly with 



