spots, which are interspersed with bluish : pleura 

 with about three white spots at the base of the 

 wings, and another at the base of the superior 

 wings : coxse^ with a white spot : anterior pair of 

 feet^ white before: abdomen with a white line 

 each side, and a broader one on the venter. 



OBSERVATIONS. 



This beautiful insect, occurred sparingly in the 

 North-Western Territory, during the advance of 

 Major Long's expedition towards lake Winnepec. 

 I also found it at that lake, as well as at the Lake 

 of the Woods, and in other parts of Upper 

 Canada. On the expedition to the Rocky Moun- 

 tains, I obtained several specimens in Arkansaw, 

 and Mr. Nuttall has recently sent me one from 

 Cambridge. 



Drury first described this insect; his figure is 

 that of a small specimen. 



The plate represents two views of the insect, 

 of the natural size. 



PLATE XXIII, 



