23 



on the dry soils of southern Illinois, but toward the north becomes 

 restricted to sand. 



Psinidia fenestralis Serv. July 6, 19. 



This species is restricted to sandy areas ; it is an eastern species, 

 not common west of the ^lississippi. In the bunch-grass no species 

 of the Ocdipodinae but Spharagemon outnumbers it. It occurs at 

 times in blowsand. In the Havana region it is much more abundant 

 than it would be in similar associations farther west. 



T rimer otro pis citrina Scudder. July 8. 



This species is most commonly found on the sandy shores of large 

 rivers, and on the shores of the South Atlantic and Gulf States. It 

 occurs also in the interior in sandy or sparsely vegetated arid places. 

 One specimen, from the Devil's Neck, in bunch-grass; Hart took one 

 at the Devil's Hole. Not a typical bunch-grass species. 



Schistocerca alutacea Harris. July 19, October 8. 



This large locust is mature from late July till frost. It occurs 

 east of the Sierra Nevadas, and is of scattered distribution, being 

 more common in the southern part of its range. Restricted to sand 

 northward. In the Devil's Hole it is seldom seen far from blowsand, 

 being abundant in bunch-grass apparently only in the more sparsely 

 vegetated areas. It is terricolous. 



Campylacantha olivacea Scudder. July 19, October 7, 8. 



The species is herbicolous and short-winged. In southern Illinois 

 it is abundant on Ambrosia hidentata, but in the Havana area it does 

 not seem to be confined to any one plant. A typical western species, 

 found towards the north and the east in sand. In the Havana area 

 it is confined to bunch-grass. 



Melanopliis Havidus Scudder. July 19, October 8. 



^Mature from July till frost. It is found from Illinois and Mon- 

 tana to Texas and Arizona (Scudder). Widespread geographically, 

 but restricted locally to sand that is almost bare — blowsand and the 

 bare basins of blowouts. In this region it is the most characteristic 

 locust of the bare sand. It is a terricolous species. Flazidus was 

 very scarce in 1910, though Hart found it abundant in former years. 



Melanophis atlanis Riley. 



Not found in true bunch-grass or blowsand. Not rare, however, 

 in other parts of the sand region. In southern Illinois it is the domi- 

 nant locust of the lower Illinoian glaciation. All summer. 



