28 University of Michigan 



Triuicrotropis cincta (Thomas).^" — Amidon, Xng. 24, 1920, 

 I male. 



A single specimen of this species was taken in the road 

 between a bare pasture and a wheat field on the uplands near 

 Amidon. It is a swift flier, and was captured with difficulty. 

 While in flight this species stridulates with a rapid buzz sim- 

 ilar to that made by Chortophaga viridifasciata or Bncoptolo- 

 pliits costaUs. 



Trimeroiropis monticola Saussure.^' — Devils Lake, July 19, 

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

 4, 1920, 5 males, 2 females; Bottineau, July 31-Aug. i, 1920, 

 15 males, 9 females; Amidon, Aug. 21-28, 1920, 17 males, 8 

 females; Ft. Buford, AVilliams Co., 1883, i female (collection 

 Mich. Agr. Coll.). 



This species was fairly common in the prairie and plains 

 regions, in semi-arid situations. A single specimen was taken 

 on the dry, grassy slopes of Sully's Hill on the south shore 

 of Devils Lake. It was common in dry, grassy fields and 

 pastures in the vicinity of Bottineau, and specimens were taken 

 in brushy clearings in the Turtle Mountains among tall, dry 

 grass. In the eastern part of the state it seemed to be more 

 local in occurrence and not so abundant as farther west. At 

 ^\midon it was found in dry upland pastures, on the rock- 

 strewn slopes and the grassy mesa top of Black Butte, and 

 among the scanty vegetation on ridges and slopes in the 

 ^'breaks" of the Bad Lands. It is everywhere accompanied 

 by SpJiaragemon collare, to the collared form of which T. 

 monticola bears a striking superficial resemblance. 



Trimerotropis bruneri McNeill. — Devils Lake, Aug. 11-17, 

 1920, 37 males, 37 females; Amidon, Aug. 21-26, 1920, 4 

 females. 



^'^ Determination verified by J. A. G. Rehn. 

 ^" Determination verified by J. A. G. Rehn. 



