86 



commonest species ; Ccnchrus carolinianus and Aristida tuberculosa 

 are the two annual grasses ; tufts of Sporobolus cryptandrus are 

 quite common; and other annuals are Oenothera rhonibipetala, Cro- 

 ton glandulosus var. scptentrioiialis, Euphorbia geyeri, Proclicliia 

 floridana, Tephrosia virginiana, Cycloloina atriplicifolia, Polanisia 

 gravcolens, Crotonopsis linearis, Monarda punctata, and the western 

 species Cristatella jauiesii. Buphorbia corollata and Lespedeza capi- 

 tata are two perennials sometimes seen on blowsand. In the other 

 sand regions of Illinois the floristic composition of the blowsand 

 association varies considerably. 



The animal assemblage of the blowsand is quite distinctive, though 

 most of the species occur also in bunch-grass, just as is the case with 

 the plants. The blowsand species are, however, much less numerous 

 than those of the bunch-grass, though individuals of many species 

 common to both associations are very much more numerous in blow- 

 sand than in bunch-grass. 



PHYTOPHAGOUS ANIMALS OF THK BLOWSAND 



Herbicolous Phytophagous Animals 



Conoccphalus robustus Disonycha triangularis 



Jassidae Brnchus cruentatiis 



Aphididae Anthrax spp., adults 



Thyreocoris ciliata Bombus sp. 



Thyreocoris ciliata and Bruchus cruentatus are selective in food- 

 habits, both being associated with Cassia chaniaechrista. 



Terricolous Phytophagous Animals 



(i) Surface animals 



*Spharagemon rvyomingianuin Tcttix hancocki 



Psinidia fenestralis Geocoris bullatns 



*Schistocerca alutacea *Pheidole vinelandica 

 *Mela)wplus Havidus Peroinyscus maniculatus bairdii 



M elano plus angustipcnnis Sykilaiius Horidanus mcarnsi 



Melanoplus flavidus and Schistocerca alutacea are very abundant 

 in blowsand, but rare in bunch-grass. Melanoplus angustipcnnis is 

 rare in blowsand, but is the dominant species in bunch-grass. 



