North American Uymenojptera. 259 



\ 



17. B. tibiator, Nob. ibid, p. 322, also of this subdi- 



*' 



Vision. 



18. B. exjjlordtor. Black; feet partly rufous. 



Inhabits Indiana. 



Body black, polished; with small, prostrate hairs: 



ax 



the transverse one punctured : wings dusky, stigma rather 



feet 



pan: 



at tip. 



Length three twentieths of an inch. 



The thorax and head are much less hairy than those 

 of tibidtor, Nob., and that insect has the wings dusky at 

 tip only ; the present also is a smaller species. 



tttt Second cubital cellule confluent with the third. 



Aliolus. 



Abdomen of three principal segments. 



19. BArilobatus. Yellowish-rufous; thorax and ver- 

 tex black. 



Inhabits Indiana. 



Body rufous, tinged with yellowish: head black on 

 the vertex : antennae blackish, excepting the two or 

 three basal joints ; about as long as the body : mandibles 

 black at tip : thorax somewhat trilobate, black, with an 

 obsolete rufous central spot : scutel black : wings hya- 

 line; nervures and robust carpus black; second cubital 

 cellule confluent with the third ; inferior discoidal cellule 

 half as large as the central one : posterior tibice dusky 

 except at base : coxa yellowish : ahdomen oblong sub- 

 ovate, short, dusky at tip ; densely punctured, with three 

 sef^ments, decreasing in length ; a small, almost concealed 

 terminal segment. 



Lenofth $ one fifth of an inch. 



