n8 REPORT OF NEW JERSEY STATE MUSEUM. 



SIPHOCORYNE Passerini. 

 S. salicis Monell. Occurs on various species of willow. 



RHOPALOSIPHUM Koch. 

 R. berberidis Fitch. Feeds on barberry. 



R. dianthi Schrank. Kinkora (U S Ag). On pinks, carnations and ger- 

 man ivy. In greehouses throughout the State. 



R. rhois Monell. A feeder on sumac. 



R. solani Thos. Tomato-plant louse; sometimes does serious injury in 

 parts of Salem and Gloucester Counties (Sm). 



R. violas Pergande. On violets in greehouses throughout the State. 



MYZUS Passerini. 



M. cerasi Fabr. Very abundant throughout the State on cherry and 

 sometimes does severe injury. This is one of the black lice, very 

 resistant to ordinary sprays, and best dealt with in late September 

 when the sexed forms appear. 



M. mahaleb Fonsc. On plum, and a great variety of other plants. 



M. persicse Sulz. The green-peach louse. Throughout the State, but 

 never in harmful numbers so far as I am aware. 



M. ribis Linn. Occurs throughout the State on currant. Causes a dis- 

 tortion and reddish discoloration of the leaf which is sometimes quite 

 conspicuous and occasionally injurious. 



PHORODON Passerini. 



P. humuli Schrank. The hop-plant louse. Throughout the northern part 

 of the State wherever hops are grown, and reported also at Freehold 

 (U S Ag). The winter food is plum and only the summer forms occur 

 on hop. 



NECTAROPHORA Oestl. 



N. avenas Fabr. (granaria Kirby.) The wheat-louse. Occurs throughout 

 the State, and, in the southern counties, sometimes in destructive 

 numbers. Ordinarily kept in check by its natural nemies, and when it 

 does occur in numbers insecticide applications are generally im- 

 practicable. 



N. cucurbitae Thos. On squash and pumpkins. Sometimes rather abund- 

 ant late in the season, but never in harmful numbers. 



N. fragariae Koch, var. immaculata Riley. On leaves of strawberry. 



N. lactucae Kalt. Lettuce-plant louse. 



N. pisi Kalt. (destructor Johns.) The pea-louse. Throughout the State 

 south of the Piedmont plain, and seasonally common and destructive. 

 Less abundant in the more northern counties. 



N. rosae Linn. Throughout the State on rose; often common and injuri- 

 ous. Tobacco decoction is, on the whole, the most effective material 

 against this species. 



