6 Univcrsitx of Michigan 



large areas of mud and sand flats and stony beach exposed, 

 which are among the striking features of the region. The 

 neighborhood is largely under cultivation, and almost no areas 

 of vmtouched prairie of any size remain. The only natural 

 wooded areas occurring in this part of the state are found 

 about the margins of the lakes and streams ; these forests are 

 largely of oak, mingled with elm, aspen, and other trees, and 

 are of considerable extent, being from a quarter to one-half 

 mile in depth in places around the margins of Devils ahd 

 Stump lakes. There are, however, large numbers of planted 

 groves everv'where on the prairies, usually of poplars or other 

 swift-growing trees, which are probably exercising a consider- 

 able influence on the fauna. From among the woods on the 

 south side of Devils Lake there rises a dry, grassy elevation 

 of considerable height, known as Sully's liill, where were 

 found Melanoplns conspcrsus and Phoctaliotcs iiebrascciisis, 

 not taken elsewhere in the eastern part of the state. The cul- 

 tivated fields, grassv prairie, exposed sandy and gravelly flats 

 around the lakes, woodland, the grassy swales in the moist 

 depressions and tlie marshes about the margins of the lakes 

 and ponds constitute the jjrincipal Orthopteran habitats in this 

 region. Although collections were made at a large number 

 of localities in the vicinity of Devils Lake, in this paper no 

 attempt has been made to mention them in detail ; instead they 

 have been grouped under the general name of Devils Lake. 



B. Turtle Mountains (Lake Upsilon, Rolette County ; Lake 

 Metagoshe, Bottineau County). ^ — The Turtle Mountains lie 

 midway across the Canadian boundary, occupying portions of 

 Rolette and Bottineau counties in North Dakota, and project- 

 ing north into Manitoba ; they have an area of from 600 to 

 800 square miles. They consist of a group of low, drift- 

 covered hills forming a rough table-land, which rises abruptly 



