INSECTS INJURIOUS TO THE POTATO. 



253 



There are two broods during the season, the hirva? of 

 the first appearing in June, and that of the second in 

 August; but the beetles of the second brood do not emerge 

 until the following spring. In other respects the life- 

 history is practically the same as that of the Colorado 

 Potato-beetle. The beetle is of a pale yellow color, with 

 three black stripes on its back, and in a general way 



Fig. 144. — Three-lined Leaf-beetle (Lema trilineata Oliv.). a, 

 larva; h, pupa; d, eggs; beetle at right. (After Kiley.) 



resembles the common striped Cucumber-beetle (Diahrotica 

 vittata Fab.), though it is somewhat larger and the thorax 

 is decidedly constricted. 



In case it becomes necessary to destroy the Blister- 

 beetles, both they and the Three-lined Leaf -beetle may be 

 readily disposed of by applying Paris green or other arsen- 

 ite as advised for the Colorado Potato-beetle. 



