174 HYMENOPTERA ACULEATA. 



OBTUSILIXGUES. 



There is only one family in this division. 



COLLETIDiE. 



Of this family there are only two British genera, very 

 unlike each other in general appearance, one, Prosopis, 

 being composed of small, almost glabrous, black species ; 

 the other, Colletes, being densely hairy on the head and 

 thorax, and much larger in size, but both are alike in the 

 obtuse tongue, which is sub-triangular, widest anteriorly, 

 with its anterior margin largely and angularly emarginate ; 

 this character separates them at once from all the members 

 of the Acutilingues ; they are also alike in the strangely 

 modified seventh and eighth ventral segments of the 

 abdomen. 



(2) 1. Species witb the head and thorax densly hairy, 



anterior wings with three submarginal cells . Colletes. 



(1) 2. Species nearly glabrous, anterior wings with two 



submarginal cells Peosopis. 



COLLETES, Latr. 



Head and thorax densely hairy, tongue short, deeply 

 emarginate, paraglosste acute, their anterior margin fringed 

 with long hairs ; maxillary palpi six-jointed ; labial palpi 

 four-jointed, all the joints subequal and cylindrical, sub- 

 mentum hyaline, lora composed of the thickened convex, 

 apical portion of the membrane which connects the cardines, 

 labrum transverse ; anterior wings with three submarginal 

 cells, and with the marginal cell slightly appendiculate ; 

 abdomen usually banded with whitish pubescent bands, 

 although these are absent in cwnicularia, c? with the 

 seventh ventral segment terminating in two wing-like 

 appendages, eighth produced into a narrow compressed 

 process, hairy at the apex, genital armature with the 

 stipites apparently two-jointed, sagittas with a more or 



