Vol. 1] 



Essig. — Aphididae of California 



309 



article III. numbering from 21 to 30 and covering the entire 

 length excepting the extreme base. On article IV there are from 

 3 to 8 which are usually confined to the apical two-thirds of the 

 joint. On article V there are from 2 to 9 distributed indefinitely 

 along the entire length. There are from 1 to 6, not including 

 those in the process, on article VI located usually near the middle 

 of the base. The following tabulation, which does not include tlie 

 sensoria in the process of VI, will serve to give an idea of the 

 variation in numbers on the respective articles : 



Fig. 5. MysocalUs arundicolens (Clarke). 

 B E, antennae. (Original.) 



Male. A, dorsal aspect; 



Individuals 

 1 



