104 



ENTOMOLOGY. 



broad square beak; antennae inserted in front of the eyes, variable 

 in length, serrate or pectinate; tibial spurs distinct or obsolete. The 

 larvae live in the seeds of leguminous plants. Bruchus pisi (Linn.) 

 infests peas, and B. obsoletus Say is the bean weevil. 



Family Chrysomelidae. — The leaf beetles have the antenn;e of mod- 

 erate length or short, not inserted upon frontal prominences; front 

 small, oblique, sometimes (Hispiui, Cassidini) indexed ; pronotum 

 most frequently margined; tibial spurs usually wanting. This family 

 includes the Colorado potato beetle and other species, which are 

 injurious to garden vegetables. The potato beetle (Doryphora 10- 



frr. 



gpimmx? 



Fig. 100.— Turnip flea-beetle, a, 

 larva; b, pupa. 



Fig. 101.— Squash beetle, a, larva; b, pupa. 



lineata Say) finishes its transformations within a month after hatching 

 from the yellow eggs which are laid on the under side of the potato 

 leaves. In the Central States there are three broods, each of which 

 pupate usually under ground, the first two broods remaining in the 

 soil for ten or twelve days, while the third brood remain under 

 ground through the winter, the beetles appearing late the next 

 spring. 



The flea-beetles (Haltica) are little dark jumping beetles which 

 eat tender and young beets, cucumbers, turnips, etc. (Fig 100). The 



Fig. 109.— Apple-tree borer, n, larva; 6, pupa; c, beetle.— After Riley. 



squash beetle (Diabrotica vitlata Fabr.) appears on squash and cucum- 

 ber vines as soon as they are up, eating the young leaves. The elm- 

 leaf beetle iGaleruea xantlionu lema Schr.) has of late years caused the 

 leaves of that tree to wither and die, destroying the tree in towns 



