254 Mr. Cameron on 



second a little beyond the second transverse cubital nervure ; 

 the nervures fuscous. 



The $ has the clypeus at the apex broadly rounded ; the 

 black on the second abdominal segment is more extended ; 

 the fifth segment is black and the sixth yellow ; the pygidial 

 area is punctured strongly, narrowed a little at the base, and 

 with the apex transverse. Length 7 — 8 mm. 



This species is represented by numerous examples of both 

 sexes, and it appears to be tolerably constant in coloration. 

 Vischnu may be known from it by the black face, by the 

 truncated clypeus, by the absence of yellow on the thorax 

 and on the second abdominal segment ; dentata by the 

 teeth on the thorax. 



Cerceris Vischnu. (PL X., Fig. 7 — ya, b.) 



Black ; the scape, the apex of the clypeus, the antennal 

 ridge, a mark on the cheeks, a small mark on the sides of 

 the pronotum, the apex of the third abdominal segment, 

 a mark in the centre of the fifth, the four anterior tibiae in 

 front, the four anterior tibiae, the base of the hinder, pale 

 yellow ; the femora beneath and the hind coxae rufous ; the 

 petiole and base of second segment ferruginous. Clypeus 

 with the apex projecting, but not sharply and with a slight 

 incision. Ocelli in a curve ; the posterior separated from 

 each other by more than the length of the third antennal 

 joint and by its length from each other. The face covered 

 with a silvery pubescence, the rest of the body with pale 

 hair ; the punctuation close, rugose. Trigonal area not 

 very clearly defined, rugosely punctured. Petiole a little 

 longer than broad ; pygidial area rugose, slightly narrowed 

 towards the apex, which is bluntly rounded ; the hair fringe 

 dense, obscure fulvous ; the incision in hypopygium a little 

 longer than broad, the base rather sharply pointed. Wings 

 clear hyaline, the apex smoky ; the second cubital cellule 

 longer than broad ; the recurrent nervure received shortly 



