THE MONTHLY BULLETIN. 



83 



Food Plants.— The lice work upon the Tinder sides of the leaves of 

 the California black walnut (Juglans calif ornka) . Great colonies 

 may often appear so as to completely cover the foliage and the amount 

 of "honey secreted is sufficient to cause smutting-, rendering the trees 

 very unsightly. 



THE BAMBOO PLANT LOUSE. 



Myzocallis arundicolcns (Clarke). 

 (Fig. 65.) 



General Appearance. — The adult lice are about one tenth of an inch 

 long and pale yellow in color. INIiscroscopic examination reveals the 

 facts that the antenna^, the sides of the thorax, two rows of tu1)ercles 

 upon the abdomen, the wing veins and feet are light brown or dusky. 

 The young lice show little or no markings. There appear to be no 

 apterous females. 



Distribution. — This pest is usually found w^herever the bamboo is 

 grown. It has been collected at Santa Barbara, San Francisco, and 

 Sacramento, and probably occurs very generally over the central and 

 southern parts of the State. 



Fig. 65. — The bamboo plant louse, Myzocallis arundicolens (Clarke). A, adult 

 female ; 1, third antennal article ; 2, sixth antennal article ; 3, anal lobe or plate ; 

 4, style; 5, cornicle. (Original.) 



Food Plant. — The lice feed upon the under sides of the leaves or 

 blades of bamboo, often collecting in large colonies and doing much 

 damage by weakening the plants and smutting the foliage. 



