XXI 



Fig. 1. Interior of a black-jack forest. — On the ground are Melanoplus fanciatus, M. luridus, and 



M. impudicus, and under gatherings of dry leaves Gryllus is abundant. Along the 



forest margins are Schistocerca alutacea and Hippiscus phcenicopterus. 



Fig. 2. Interior of a mesophytic forest of white oak and bur-oak on a sand ridge extending along 



the low marginal bluff of the sand plain bordering the Illinois River — On the 



ground are M elan o plus scudderi and Spharagemon bolli. 



