LAKE TO FOREST OR PRAIRIE 



255 



are found most often in the wet prairie; the others belong to 

 the dry prairie association. Prairie horned lark and lark bunt- 

 ing are not very common residents of the Chicago region. 



The common toad is preva- 

 lent, as would be expected, in 

 a region where insects are so 

 common. The green snake, 

 Leiopellis vernalis, green above, 

 greenish white below, is the 

 characteristic snake, especially 

 in the moist prairie, while the 

 prairie garter snake is more 

 common on the dry prairie, 

 though becoming rare. 



The short wing and the 

 long- winged grouse locusts, Tettigidea parvipennls, T. pennata, 

 live on the ground of the wet prairie. They are small, obscure 

 because of their ground color, and appear in the spring. Later 



Fig. 380. — Striped gopher, Citellus 

 tridecemlineatus. 



Fig. 381. — Pocket gopher, Geomys hursarius 



these small forms give place to the more familiar locusts and 

 grasshoppers of the summertime. The characteristic ones of 

 the wet prairie are Xiphidmm fasciatum, the red-legged locust 

 (Fig. 383), the two-lined locust (Fig. 383), and the short- winged 



