50 Dr. A. S. Packard, Jr's Revision of the 



propodeuui. The length of the scutellum of meso-thorax is a little 

 more than twice included in the breadth, i. e. that part from which the 

 sides slope to the insertion of the wings. The propodeum is either of 

 moderate size and distinctly triangular or it occupies the whole notal 

 portion and is rounded behind in Philanthus, presenting a raised area 

 conspicuously marked and the apex is bent down abruptly. 



The enclosure of propodeum is a little produced, sub-triangular, 

 with a median impression from which the sides bulge out; its hinder 

 edge is inclined downward at a considerable angle. Coxas rather small, 

 those of hind legs long and rather slender being twice as long as 

 broad; trochanters are likewise slender being a third longer than thick. 



Legs rather long ; femora swelled considerably ; tibias trigouate and 

 well tuberculated ; tarsi in $ very long, and lobes produced acutely, 

 ending in long setae in fore legs, first joint on the outside with a few 

 lateral, long, slender spines. 



Wings : primaries much as in Crabro, but the apex still more pro- 

 duced aud acute, and the outer margin is not convex but straight. 

 The outer costal is oval lanceolate being somewhat produced towards 

 the outer end. There are four sub-costal spaces ; the two middle ones 

 sub-equal, or the second is incomplete ; that is, does not reach the 

 outer costal space, being pedunculated in Cercen's, and generally 

 assuming a triangular form. 



There are three median spaces, the inner or first being much pro- 

 duced rhomboidal, and so much so, aud at the same time so rounded at 

 the outer eud, that it loses the distinct lozenge form somewhat. The 

 second internal varies in length, width and form of the outer side and 

 is of no use for sub-family characters. Secondaries are broad, often 

 nearly twice as mucb so as iu Crabrones; as in the Nyssonidae but 

 less so in Pemphredoniuaj. The median or discal space is very much 

 produced, being closed by a short recurrent beyond the outer fourth 

 of the wing, from which the m. and s. c. terminates in the outer mar- 

 gin just below the apex; the first internal space is rather broad. 



Abdomen uniformly longer than the head and thorax, the wings very 

 couvex, which is one of the best characters; the first ring almost two- 

 thirds as broad, and nearly as broad as the succeeding, and more regu- 

 larly triangular as in Philanthus. Iu Philanthus more than in Cerce- 

 ris, the abdomen is flattened beneath, but this is subject to variation. 

 The female has the last ring of abdomen thickened, with the lateral 

 ridges above bounding an oval or triangular area. 



The position of the ocelli iu relation to the highest part of the 



