92 AMERICAN ENTOMOLOGY. 



rufous ; at the extreme base, black ; terminal submargin of tbe 

 superiores, and terminal and inner submargins of the inferiores, 

 dusky ; the corresponding margins pale. 



Obs. This large and splendid species occurred within a hun- 

 dred miles of the Rocky Mountains, on the banks of the Arkan- 

 saw river. It was not uncommon, and in consequence of the 

 striking color of the wings, as well as of its slow and steady flight, 

 it was readily observed and taken. It was occasionally found 

 perched on flowers, in company with Stizus grandis nobis, and 

 other Hymenopterus insects. The strongest similarity certainly 

 exists between the P. formosus here represented, and the Pepsis 

 marginata Beauv., but that species is so much larger, that we 

 cannot believe it to be the same. 



The upper figure of the plate. 



[This species extends as far as San Diego, California. — Lec.] 



Pompiltjs unifasciatus. — Specific character. Black ; an- 

 tenna? and large wing spot, yellow. 



Desc. Body black, tinged with purplish : antenna?, excepting 

 the first and second joints, bright yellow : wings violaceous- 

 black ; superior pair with a broad yellowish band or spot near 

 the tip of each, abbreviated before the inner margin, and of a 

 subquadrate or nearly orbicular form. 



Obs. On a recent journey, in company with Mr. Maclure, I 

 had the gratification to find this handsome species in the vicinity 

 of Easton, Pennsylvania. I have not seen it elsewhere. Only a 

 single specimen occurred, which is a female. 



The middle figure of the plate 



Pompilus terminatus. — Specific character. Black ; wings 

 pale fulvous, with a dusky tip. 



Desc. Body black, with a slight purplish tinge : antenna? black : 

 superior wings pale fulvous, with a broad dusky tip : inferior 

 wings paler. 



Obs. This species was brought by Major Long's party. I 

 caught it near the Arkansaw river, about two hundred miles 

 from the Rocky Mountains. But one specimen occurred, which 

 is a female. In the proportion and distribution of the colors of the 

 wings, it resembles P. discolor and annulatus Fabr., but in mag- 

 nitude and color of the body it is very distinct. 



The lower figure of the plate. 



