270 



THICKET COMMUNITIES 



milkweed beetle (Tetraopes tetraophthalmus Forst.) (40, p. 136), and the 

 leaf-beetle (Doryphora clivicollis) ; the latter is very characteristic. The 

 milkweed flowers attract hosts of flies which are preyed upon by vari- 

 ous digger-wasps; bees are numerous, gathering honey. The ground- 



268 269 



Fig. 268. — The four-lined leaf-bug (Poecilocapsus Uneatus); a, adult; b, c, imma- 

 ture forms; 5^ times natural size (from Lugger). 



Fig. 269. — A long-legged fly (Psilopodinus sipho Say) ; enlarged (from Williston 

 after Lugger) . 



270 271 



Fig. 270. — A large robber-fly (Dasyllis sp.); natural size (from Williston after 

 Kellogg). 



Fig. 271. — A syrphus fly (Eristalis tenax); i| times natural size (from Williston 

 after Kellogg). 



cherry is the food plant of the "Spanish fly" (Epicuata) and the 

 Colorado potato-beetle. On the thistle we find the larvae of the cos- 

 mopolitan and painted-lady butterflies (Pyrameis hunter a Fab. and 

 cardui Lin.). One of the most characteristic bugs is the 4-lined 



