DESCRIPTION. 



Body black, entirely covered by dense, short, 

 prostrate greenish or yellowish-white hairs : head 

 with a longitudinal impressed line : antennx sub- 

 glabrous ; first and second joints rufous, the latter 

 nearly equal in length to the third joint : clypeus, 

 labrum^ and palpi pale rufous : tarsi black. 



OBSERVATIONS. 



Another remarkably fine species, which I dis- 

 covered within about a hundred miles of the 

 Rocky Mountains, during the progress of Major 

 Long's expedition over that vast desert. It ap- 

 peared to be feeding upon the scanty grass, in a 

 situation from which the eye could not rest upon 

 a tree, or even a humble shrub, throughout the 

 entire range of its vision, to interrupt the unifor- 

 mity of a far outspreading, gently undulated sur- 

 face, that, like the ocean, presented an equal 

 horizon in every direction. 



The upper right figure, natural size. 



