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



DESIDERATA. 



Cerceris frontata, Say. 



C. frontata, Say, West., Quart. Eep. ii. p. 80, J. (1823.) 

 Cresson, Proc. v. p. 129. 

 Arkansas, (Say.) 



Cerceris bidentata, Say. 



C. bidentata, Say, West. Quart. Rep. ii. p. 80, J. (182.3.) 

 Cresson, Proc., v. p. 130. 



Cerceris verticalis, Smith. 



C. verticalis, Smith, Cat. Hym. iv. p. 466. (1856.) 

 Cresson, Proc. v. p. 130. 

 Georgia, (Smith.) 



Cerceris elegans, Smith. 



C. elegans, Smith, Cat. Hym. B. M. iv. p. 467. 

 Cresson, Proc. v. p. 131. 

 East Florida, (Smith.) 



Cerceris Dufourii, Guer. 



C. Dufourii, Guerin, Icon. Peg. Amin. iii. p. 444. (1838.) 

 Cresson, Proc. v. p. 131. 



New Orleans, (Guerin.) 



Cerceris laevigata, Smith. 



C. laevigata, Smith, Cat. Hym. B. M. iv. p. 465. 

 Cresson Proc. v. p. 132. 



" St. Domingo," (Smith.) 



Cerceris Perboscii, Guer. 



C. Perboscii, Guerin, Icon. Reg. iii. p. 444. (1838.) 

 Smith, Cat. Hym. B. M. p. iv. 448. 

 Cresson, Proc. v. p. 132. 

 " Bay of Campeche," (Guerin.) 



Subfamily Crabronin^:. 

 Head large, cuboidal, being seldom less than a third shorter than 

 long, most often narrowing behind in % ■ the vertex broad and flattened, 

 the eyes very broad, oval and extending to or slightly beyond the mid- 

 dle of the vertex, ocelli placed generally in an equilateral triangle on 

 the vertex in its middle. The eyes are very much increased in width, 

 encroaching very much on the front, and often also on the side oppo- 

 site the ocelli, presenting a very slight sinus, thus making the front 

 area of the head broadly triangular and concave, which ia the best 

 and most constant character of the group. Their distance apart on 

 the vertex varies in the different genera. The front slopes gradually 

 or suddenly from the vertex into a broad, rather deep groove for the 

 reception of the scape of the antennae, the sides are often thickly 



