Occasional Papers of tJie Museum of Zoology 35 



In the vicinity of Amidon this species was fairly common 

 on the dry, grassy uplands, on the slopes of the buttes, and 

 among the "breaks'' of the Bad Lands, always in close asso- 

 ciation with the white sage (Artemisia spp.). Most of the 

 specimens were taken by sweeping patches and clumps of 

 Artemisia with the net. A few individuals were found on 

 other types of vegetation, but always in the immediate vicinity 

 of patches of sage-brush. The color of Hypochlora alba abso- 

 lutely reproduces that of its food-plant, and the grasshoppers 

 are invisible when clinging to the Artemisia stems so long as 

 they remain motionless. 



Hesperotettix prdtensis Scudder.-^ — Lake Upsilon, Turtle 

 Mountains, Aug. 6, 1920, i female; Williston, July 24, 1920, 

 I male ; Medora, July 29-Aug. 3, 1920, 5 males, 8 females ; 

 Amidon, Ang. 21-28, 1920, 5 females. 



A single specimen of this species was taken near Lake 

 Upsilon in a thick growth of tall weeds — goldenrod, fireweed, 

 nettles, Helianthus, and many others — ^standing three to four 

 feet high on the higher ground around the borders of a grassy 

 marsh. In the Great Plains region it is fairly common, though 

 it was not abundant in any of the localities visited. In this 

 region it was found in dry, grassy fields and pastures on the 

 uplands, and among sparse vegetation on barren clay and sandy 

 soils in the Bad Lands and on the flood-plain of the Little 

 Missouri River. 



Aeolopln-s hmneri Caudell.— Buford, July z^,, 1920, 3 males. 

 3 females ; Medora, July 29-Aug. 3, 1920, 21 males, 16 females ; 

 Amidon, Aug. 21-24, 1920, 15 males, 15 females. 



Abundant on the viplands near Amidon, on the dry, sparsely 

 vegetated flats and sloping banks around the margins of a 

 small alkali lake. The insects are very active, and leap and 



21 Determination verified by J. A. G. Rehn. 



