462 HYMENOPTERA. 



taceous-yellow, with the extreme base of the third segment 

 black ; beneath, dark rufo-testaceous, with the apical margins of 

 the segments pale testaceous. 



Hab. Brazil (Villa Nova). (Coll. H. W. Bates.) 



96. CERCERIS SIMPLEX. B.M. 



Female. Length 7 lines. Black, punctured : the clypeus 

 produced in front, obconic, slightly elevated ; the flagellum ful- 

 vous beneath towards the base ; the post-scutellum, a spot on 

 the subcordate space at the base of the metathorax and two 

 elongate spots beneath it, yellow ; the legs fusco-ferruginous, 

 brightest beneath ; the anterior half of the fore wings dark fus- 

 cous, the posterior portion hyaline ; the posterior wings slightly 

 coloured. Abdomen : the sides and apical margin of the basal 

 segment yellow ; the sides of the abdomen and beneath thinly 

 covered with a fine silky white pubescence. 



The male differs in having a yellow line at the inner orbit of 

 the eyes, and a yellow spot on each side of the metathorax, the 

 spot on the subcordate space and also those below it being 

 obsolete. 



Hab. Brazil (Santarem). (Coll. H. W. Bates.) 



97. CERCERIS TRICOLOR. B.M. 



Female. Length 5 lines. Black : the face yellow ; the scape 

 in front, the base of the mandibles and a large spot on the 

 cheeks, yellow ; the vertex ferruginous, with a large black spot 

 on the front, which encloses the ocelli ; the antennae ferruginous, 

 the flagellum fuscous above towards the apex. Thorax : the 

 collar, a spot in front of the tegula3, two beneath the wings, 

 another on each side of the scutellum and the post-scutellum, 

 yellow ; the sides of the metathorax ferruginous ; wings fusco- 

 hyaline, with a darker cloud at their apical margins ; the nervures 

 fuscous, the costal nervure and stigma pale ferruginous ; the 

 legs ferruginous, with the tibiae yellowish in front. Abdomen : 

 the basal half of the first segment ferruginous, the apical half 

 yellow ; the apical margins of the third and fifth segments with 

 a narrow yellow band ; beneath, immaculate. 



The male differs in having the vertex and metathorax black ; 

 the first segment of the abdomen is black at the base ; the mark- 

 ings are the same, with the addition of two transverse spots on 

 the vertex. 

 Hab. Brazil (Santarem). (Coll. H. W. Bates. ) 



