Bui. 903, U. S. Dept. of Agriculture. 



Plate XI. 







J 



/" \ 



The Grape Phylloxera in California. 



Phylloxera vitifollae: a, Nymph, dorsal view; ft, outline ventral view of same; c, enlarged 

 sensorium on antennse; d, enlarged tubercle with spine; e, microscopic structural view of 

 tubercle;/", hind leg; g, beak showing structure; h, middle leg; r, right antenna; I, left 

 antenna. 



