POTATO INSECTS 



149 



be used instead of paris green because of the danger of foliage 

 injury by the latter. 



References 



Riley, Potato pests, N. Y. 1876. 



Tower, An investigation of evolution in Chrysomelid beetles of the 



genus Leptinotarsa. Washington. 190G. 

 U. S. Bur. Ent. Circ. 87. 1907. 



Girault and Rosenfeld, Psyche, 14, pp. 45-57. 1907. 

 Girault, Ann. Ent. Soc. Am., 1, pp. 155-178. 1908. 

 U. S. Bur. Ent. Bull. 82, pp. 1-8. 1909. 



Girault and Zetek, Ann. Ent. Soc. Am., 4, pp. 71-83. 1911. 

 Va. Truck Exp. Sta. Bull. 14. 1915. 

 Johnson and Ballinger, Jour. Agr. Research, 5, pp. 917-925. 1916. 



The Three-Lixed Potato Beetle 



Lema trilincata Olivier 



Throughout the United States and Canada east of the Rocky 

 Mountains, potatoes and tomatoes are sometimes attacked 

 by the larvae of a yellowish leaf- 

 beetle (Fig. 86) about \ inch in 

 length. The head and thorax are 

 reddish yellow, the latter constricted 

 at the middle and usually marked 

 wnth two black spots. The wing- 

 covers are reddish yellow and marked 

 with three black stripes. The an- 

 tennae are black, except the base, 

 and the legs are reddish yellow 

 with the outer half of the tibiae 

 and tarsi black. A closely related 

 species, Lema nigrocittata Guerin- 

 Meneville, occurs in California ; by 

 some it is considered identical with the eastern species. 



The three-lined potato beetle probably hibernates in the 

 adult condition, the beetles appearing in early spring. They 



Fig. 8G. — The three-lined 

 potato beetle (X 3§). 



