60 



THE MONTHIjY bulletin. 



fS 



Fig. 48. — The cabbage louse (Ai)his hrassicw Linn.). A, winged female; B and 

 C, apterous females ; D, F and H, cornicle, style and antenna of winged female ; 

 E, G and I, same of apterous female. (Essig, P. C. Jr. Ent. ) 



Distribution. — Throughout the entire State. 



Food Plants. — All members of the Criiciferce including cabbage, 

 cauliflower, lirussels sprouts, mustard, radish, etc. 



Natural Enemies. — The ladybird beetles, Hippodamia convergens, 

 Megilla maculata and Coccinella californica, prey to some extent upon 

 this pest. The real check, however, is the internal parasite, Diceretus 

 calif orniciis Baker. 



