Occasional Papers of the Museimi of Zoology 19 



1920. I male ; Lake Upsilon, Turtle Mountains, July 30, 1920, 

 I female ; Buford, July 23. 1920, i male, 2 females ; Medora, 

 July 30-31, 1920, 4 males, i female; Amidon, Aug. 21-28, 

 1920, 13 males, 13 females. 



One specimen was taken in each of two localities in eastern 

 North Dakota ; in the west it was common at Buford and 

 Medora, and very common in the vicinity of Amidon. In all 

 cases this species was found among dry grasses, frequently 

 where a considerable amount of bare soil was exposed among 

 the scanty vegetation. At Amidon it was most numerous on 

 the dry, grassy uplands, but also occurred among the xero- 

 phytic vegetation on the barren slopes in the Bad Lands. It 

 seemed to be more abundant in the late summer and fall than 

 in the earlier part of the season. The fact that most of the 

 collecting in the eastern part of the state was done in July 

 may accovint for its apparent scarcity in that region ; although 

 no nymphs were found, it may possibly become more numer- 

 ous in August and September. 



Agcneotettix deoriim stridulates in somewhat the same man- 

 ner as Chortippus curtipennis. Each series of notes consists 

 usuallv of four or five rapid but distinct strokes, the whole 

 occupying approximately one second ; the periods of stridu- 

 lation are separated by intervals of approximately the same 



length. It may be represented as follows : sik-sik-sik-sik 



sik-sik-sik-sik sik-sik-sik-sik . 



Aidocara elliotti (Thomas). — Buford. July 2t,, 1920, i male; 

 Amidon, Aug. 23-26, 1920, 2 females. 



The specimen taken at Buford was found in dry grass at 

 the side of a road on the bluffs above the flood-plain At Ami- 

 don one female was found on the hard, sun-cracked clay 

 margins of a small, shallow alkali lake on the uplands east 

 of town, among scattered tufts of grass and chenopodious 



