SUBFAMILY III. LOCUSTIX^E. 427 



ciiieipcs is but a red-legged form of M. angustipennis." Walker 

 (1910, 338) mentions angustipennis from Aweme, Man., with both 

 blue and red hind tibiae, and says: ''The red-legged individuals, 

 commonly known as M. coccineipcs, are certainly not distinct 

 from the typical blue-legged form." The two forms are therefore 

 again placed as a single species. 



The general range of august i pat nis (including its synonym, 

 coccineipes) is mainly to the west and northwest of its Indiana 

 station, extending from Sudbury, Out., and Douglas Lake, Mich., 

 to Aweme, Man., and Yellowstone, Montana, south to southern 

 Colorado, Kansas and Texas. At Douglas Lake Vestal (1914, 108) 

 found it rather common, July 1 August 14, in open aspen thick- 

 ets among plants of bracken and blueberry near the borders of the 

 lake. Hart (1907, 234) recorded it as very abundant everywhere 

 on waste sandy land in northwestern Illinois; also at Waukegan 

 on sandy ridges near Lake Michigan. Vestal (1913) also says 

 that "it is the most abundant and most characteristic locust in the 

 bunch-grass, being the chief plant-eater in the Illinois sand- 

 prairie from July until frost." From the records it appears to be 

 scarce in both Iowa and Minnesota, but in Nebraska Brunei* 

 (1897, 136) mentions it as "quite common on low grounds in the 

 eastern half of the State, preferring Artemisia ludoric'utna as a 

 food plant." He also states that it is increasing rapidly in num- 

 bers, and is likely in places to become a serious pest. The vege- 

 tation of the area which it is known to inhabit in Indiana is not 

 sufficient in quantity and value to enable it to do much damage. 

 Several successive favorable seasons might, however, enable it to 

 so increase in numbers as to cause it to migrate into the richer 

 agricultural regions to the south and east. 



199. MELANOPLUS IMPIGEB Scu-dder, 1897b, 26. 



Distinctly larger and more robust than angustipennis. the sexes sub- 

 equal in size. General color darker, the prozonal dark bar wider, usually' 

 more vague in female. Tegmina as described in key. Hind femora with 

 upper outer face more or less suffused with fuscous, lower face often feebly 

 roseate. Hind tibiae normally glaucous, sometimes red, paler at base and 

 tips, the spines with only the apical halves black. Interocular space wider 

 and fastigium more broadly and shallowly silicate than in angustipennis. 

 Prozona one-fourth longer than metazona, male, the two subequal in length, 

 female. Tegmina but slightly surpassing the hind femora in either sex. 

 Supra-anal plate much as in angustipennis, with basal two-thirds rela- 

 tively longer and less broad, its sides less curved but thickened and up- 

 turned as there. Cerci stouter, with dorsal margin more distinctly concave, 

 the outer face of apical half broadly sulcate (Fig. 145, a. ) Subgenital 

 plate slightly longer, its posterior apical portion more distinctly truncate, 



