Occasional Papers of the Museum of Zoology 17 



This species was one of the most abundant and ubiquitous 

 of the grass-land inhabiting forms found in the eastern part 

 of the state. It occurred in both wet and dry situations on 

 all types of soil. Though commonest in rather tall vegetation 

 in moist places, it was found in considerable numbers among 

 sparse growths of grass and other herbaceous plants on dry 

 soil. It was abundant in the marshes around the lakes in 

 the Devils Lake and Turtle Mountain regions. This species 

 seemed to be somewhat less common in the western than in 

 the eastern part of North Dakota; it was not found at Buford, 

 \Mlliston, or Medora, and was not common at Amidon. 



Gomphocerus clavahts Thomas. — -Devils Lake, Aug. 7, 1919, 

 I female; July 15-Aug. 7, 1920, 13 males, 23 females; Stump 

 Lake, July 24, 1920, 8 males, 4 females ; Sheyenne River, 

 Eddy Co., Aug. 8, 1920, i female; Buford, July 23, 1920, 4 

 males, i female ; Williston, July 24, 1920, 4 males, 2 females ; 

 Medora. July 29- Aug. 3, 1920, 2 males, 4 females ; Amidon, 

 Aug. 21-28, 1920, 12 males, 23 females. 



This species was common in dry, grassy fields and pastures 

 in the Devils-Stump Lake region ; it probably occurs in simi- 

 lar situations throughout the eastern part of the state, although 

 for some reason none were taken in the Turtle Mountains, 

 at Bottineau, or at Fargo. It was one of the commonest 

 species in the more arid western portion of North Dakota, 

 where it occurred abundantly on the dry, grassy uplands and 

 on the grassy slopes and ridges in the Bad Lands. 



The males of this species are very agile and difficult to cap- 

 ture, much more so than the larger and more clumsy females. 

 Their stridulation has been described by Rehn and Hebard" 

 as ". . . -sik-sik-sik-sik — a sound louder but similar to that 

 produced by Staurodcnis [Chortippus] curtipennis." While 



11 Proc. Acad. Nat. Set. Phil., Iviii, 1906, p. 371. 



