158 



ELEMENTARY ENTOMOLOGY 



The pea- weevil family (Bruchidae) includes the small weevils 

 which commonly infest peas, beans, and other seeds. They are of 

 much the same general shape as some of the leaf-beetles, but the 



head is prolonged into 

 a blunt snout, and the 

 wing-covers are square 

 at the tip, leaving the 



d P of the abdomen ex- 

 posed. They are from 



one eighth to one fourth 

 of an inch long, brown- 

 ish or ashen gray in 

 color, with whitish scales 

 or hairs on the wing- 

 covers, forming various 

 markings. Both beetles and larvae feed on seeds of leguminous 

 plants, of which they are the most serious insect pests. 



The long-horned beetles (Cerambyddae) are easily recognized by 

 the long antennas, which are rarely shorter than the body and 

 often are twice as long. They are large, stout, cylindrical-bodied 



FIG. 228. The pea-weevil. (Enlarged) 



a, adult beetle ; l>, larva ; c, pupa. (After Chittenden, 

 United States Department of Agriculture) 



a c 



FIG. 229. The common bean-weevil. (All enlarged) 

 a, beetle; , larva; c, pupa. (After Chittenden, United States Department of Agriculture) 



beetles, usually strikingly colored and patterned, attracting imme- 

 diate attention. The larvae are cylindrical white grubs which bore 

 in the heartwood of trees and are termed round-headed borers, in 

 contrast with the flattened forms of the Buprestidae. The family is a 



