Occasiojial Papers of the Museum of Zoology 41 



Melanoplus angustipennis (Dodge).- — Devils Lake, July 

 9-25, 1919, 7 males, 11 females; July 19-Aug. 17, 1920, 41 

 males, 42 females ; vStump Lake, July 24-25, 1920, i male, 2 

 females ; Sheyenne River, Eddy Co., Aug. 8, 1920, i male, i 

 female ; Lake Upsilon, Turtle Mountains, July 30- Aug. 6, 1920, 

 3 males, 2 females ; Buford, July 23, 1920, i female ; Medora, 

 July 23-Ang. 3, 1920, 7 males, 4 females; Amidon, Aug. 21-28, 

 1920, 6 males, 8 females. 



This species occurred in great abundance on the flats around 

 the shores of the lakes in the Drift Prairie region. It was 

 common among sparse vegetation on dry soils throughout the 

 state. Although in the eastern part of its range, in Illinois, 

 Indiana, and Michigan, M. angnstipcnnis is quite characteristic 

 of light, sandy soils, in North Dakota there seemed to be no 

 such correlation ; the species was found to be almost as com- 

 mon on the grass-covered clay slopes in the Bad Lands of the 

 southwest as on the sandy flats around the shores of Devils 

 Lake. 



The hind tibiae of this species are usually either red or blue ; 

 in the vicinity of Devils Lake the population seemed to be about 

 equally divided between these two types, while at Amidon 

 specimens with blue tibiae seemed to be about twice as numer- 

 ous as those with red. A number of the specimens in this 

 large series have the tibiae some shade of yellow, brown, or 

 dull green. 



Melanoplus packardii Scudder. — Devils Lake, July 9-Aug. 

 26, 1919, 2 females; July 19- Aug. 17, 1920, 3 males, 8 females; 

 Stump Lake, July 24, 1920, i female ; Sheyenne River, Nelson 

 Co., July 25, 1919, I male; Lake Metagoshe, Turtle Mountains, 

 July 16, 1919, 2 males; Lake Upsilon, Turtle Mountains, July 

 30-Aug. 6, 1920, 4 males, 2 females; Bottineau, July 16, 1919, 

 10 males. 15 females; July 31-Aug. i, 1920, 2 males. 7 females; 



