CATALOGUE OF INSECTS. 



105 



Sub-family LACHNINiE. 



LACHNUS Burm. 



L abietis Fitch. Found on spruce. 



L. alnifoliae Fitch. Feeds on leaves of alder : is probably a Callipterus (Per- 

 gande). 



L. laricifex Fitch. On the American larch or tamarack. 



L. quercifoliae Fitch. On the leaves of oak : is a Callipterus i Pergande). 



L. strobi Fitch. Feeds on the white pine. 



L. salicelis Fitch. A willow plant louse : probably a Melanoxanthus (Per- 

 gande). 



L. caryse Harr. Locally common on hickory and walnut and has been 

 accused of causing the death of trees near Glassboro (Sm). 



PHYLLAPHIS Koch. 

 P. fagi Linn. Occurs on beech : Trenton (U. S. Ag. ). 



Sub-family SCHJZONEURIN.i:. 



SCHIZONETJRA Hart. 



S. americana Riley. The woolly 

 louse on elm. 



S. imbricator Fitch. The "beech 

 blight " or woolly louse. 



S. lanigera Hausm. The woolly ap- 

 ple louse : found all over the 

 State, sometimes quite numer- 

 ous, but not as yet seriously in- 

 jurious : it forms galls on the 

 roots and clusters in masses 

 about wounds on trunks and 

 branches ; the latter type is 

 easily controlled by diluted kero- 

 sene sprays. 



S. strobi Fitch. Woolly louse on 

 white pine. 



S. ulmi Linn. A common form on 

 . elm. 



S. corni Fab. Feeds on the dog- 

 wood. 



COLOPHA Monell. 



C. ulmicola Fitch. Makes the well 

 known cockscomb gall on elm. 





vs 



Fig. 45. — Woolly apple louse : injury to the roots is 



shown at a; the adult at c, showing the 



woolly fibres, much enlarged. 



