252 Mr. Cameron on 



segment, the basal two ventral segments and the penulti- 

 mate on either side and the legs, yellow ; the femora lined 

 with fuscous above. Wings clear hyaline, the apex infus- 

 cated, the stigma and nervures fuscous. Body covered 

 closely with whitish pubescence, which is especially thick 

 on the head. The punctuation of moderate intensity ; the 

 trigonal area of median segment smooth, impunctate, 

 and there is an impunctate space on the sides of the median 

 segment and on the metapleura. Clypeus moderately 

 convex, the apex transverse, with a short blunt tooth at 

 either end. Hinder ocelli separated from the eyes by 

 the length of the third antennal joint, and by a slightly less 

 distance from each other. Eyes a little diverging beneath, 

 the orbits behind clearly margined. The scutellum is 

 .smooth, with a border of widely set apart punctures ; the 

 metanotum is impunctate. The furrow down the centre of 

 the trigonal area is shallow ; the margin of the area is 

 crenulated. Petiole a little longer than wide. Pygidial 

 area elongate, narrow, rounded at the apex ; the base 

 narrower than the apex ; the top closely and finely 

 transversely rugose ; the hair fringe white ; hypopy- 

 gium not incised. Antennae blackish above ; the fiagellum 

 obscure rufous beneath. Second cubital cellule with 

 the peduncle not much shorter than the width of the 

 cellule itself; the first recurrent nervure is received in the 

 basal third ; the second a little beyond the apex of the 

 cellule, and almost interstitial. Length 10 mm. 



This species comes nearest to C. instabilis ; but may 

 easily be known from it by the clypeus not being incised ; 

 by the punctuation being not so strong, especially on the 

 scutellum and median segment ; by the smooth, not rugosely 

 punctured, trigonal area, by the narrower, longer, straighter, 

 pygidial area, which in instabilis is wider at the base than 

 at the apex, it bearing also large punctures, and by the 

 shorter second cubital cellule. 



