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



tennae stained with a long ovate brown spot extending beyond tbe 

 middle of its length ; the nieso-scutellurn has two yellow, geminate 

 spots, and the fifth and sixth abdominal fasciae are united to form a 

 continuous band. A 9 specimen from the same locality has a broad 

 yellow band on the rneso-scutellum, more than twice as broad as on the 

 meta-scutellum, while another variety for which we are indebted to the 

 same zealous collector, has the scutellum entirely black, and only a 

 linear yellow stripe on the postscutellum. 



This peculiar species is interesting as affording a passage from Crabro 

 to Ceratocolus by its narrow, long head, narrow triangular front, 

 peculiar clavate antennae with the terminal joint spherico-conical, its 

 narrow ovate abdomen, shorter than the rest of the body which is 

 coarsely punctured. It approaches Ceratocolus jiroducticollis in its 

 head narrowing behind, and the simple uutoothed antennas and the 

 form of the abdomen, though the prothorax is much wider, shorter, 

 and the abdomen is much larger. 



It also affords a passage into Cerceris by the raised clypeus and ex- 

 posed labrum concealed partially beneath, which can be more plainly 

 seen in this species than the typical ones of the genus ; also by its con- 

 vex abdominal rings, high colors, punctured body and narrow elon- 

 gated form it connects Crabro with Cerceris. 



From Crabro mfifemur it will readily be distinguished by its much 

 smaller size, still narrower body, and longer head which narrows 

 rapidly behind ; also, by the broad yellow fasciae closely contiguous 

 or united, which are lanceolate ovate and hardly sinuate, those on the 

 second and third segments not at all so; and by the fore femora being 

 half black and yellow, but not ferruginous. 



Ceratocolus-like species. 

 % . Head twice as broad as long, being transversely oblong ; cly- 

 peus as long as broad, being unusually elongated; antennas with a very 

 clavate scape, unusually flattened flagellum, terminal joint being minute, 

 but acutely conical; thorax much elongated, especially anteriorly; 

 abdomen subglobular, being unusually short in proportion to the rest 

 of the body, shorter than the thorax, whole body very coarsely punc- 

 tured, and the rings of the thorax are more separate and convex than 

 in Crabro proper. 



Crabro producticollis, u. sp. 



% . Head transversely oblong, cuboidal, not narrowing behind more 

 than usual, surface coarsely punctured, vertex slightly convex; front 

 longer than usual, the head being unusually narrow, and the clypeus 



