THE INSECTS OF NEW JERSEY. 113 



forms and may practically exempt an alternate food-plant for the season. 

 Little systematic collecting has been done in New Jersey in this family, 

 and the list here follows Mr. W. D. Hunter's Catalogue of 1901 as pub- 

 lished in Bull. 60 of the Iowa Agricultural College Experiment Station. 

 It is probable that numerous additions will be made when our fauna has 

 been more thoroughly studied. 



Sub-family RHIZOBIIN^;. 

 All the members of this sub-family occur on the roots of plants. 



TYCHEA Koch. 

 T. brevicornis Hart. Chester VIII, 5, on roots of lettuce (Marsh). 



RHIZOBIUS Burm. 



R. lactucaa Fitch. The common lettuce-root louse; found locally in- 

 jurious. 



Sub-family CHERMAPHIN^. 







PHYLLOXERA Fonsc. 





Fig. 45. Grape leaf infested by Phylloxera. 



P. caryas-caulis Fitch. Common; making galls on twigs and leaf stalks 

 of hickory in New Jersey (Bt). 



8 IN 



