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 
Fic. 268.—The four-lined leaf-bug (Poecilocapsus lineatus); a, adult; 6, c, imma- 
ture forms; 53 times natural size (from Lugger). 
Fic. 269.—A long-legged fly (Psilopodinus sipho Say); enlarged (from Williston 
after Lugger). 
270 
Fic. 270.—A large robber-fly (Dasyillis sp.); natural size (from Williston after 
Kellogg). 
Fic. 271.—A syrphus fly (Zristalis tenax); 13 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 huntera Fab. and 
cardui Lin.). One of the most characteristic bugs is the 4-lined 
