322 University of California Puhlications [Entomology 



apterous, and is at once separated from other closely related 

 species by the large dark tubercles on the back of the winged 

 forms. It has been taken during several successive years and 

 becomes abundant in a few localities. The sexual forms were 

 taken September 16, 1916. The Norway maple, Acer plata- 

 noides Linn, and the silver maple, A. sacc]tari)iuni Linn, are 

 attacked. 



Fig. 12. PhyllapMs, sp. Colonies on the undersides of the leaves of 

 the valley oak, Quercus lobata Nee. The bodies are entirely covered with 

 the white woolly material. Rutherford, Cal., June 21, 1916. (Original.) 



Calaphis hetulaecolots (Fitch). A large green species com- 

 mon in certain restricted areas on the European white birch, 

 Bctula alba Linn. Collected on the campus June 5, 1916. 



EucerapJiis heiulae (Linn.). A large green and black plant 

 louse which is commonest on the birches in this section. It occurs 

 on the leaves of the European white birch, Bctula alba Linn., the 

 cut-leaved birch, B. populifolia laciniata Hort., and the paper or 



