1(111 BIOLOGICAL sikvkv OF 



C. pinifoliae Pitch. Forms ^alls on red spruce, .June 10. 

 0. BIMILIS Gillette. From red spruce, .July 7 (Br.). 

 C. btbobilobius Kail. Woolly larch aphid. Sal. Cove, July- 

 Aug. 



Aletbodidae 

 Trialeueodes < Jockerell 



T. vaporabiorum Westw. Greenhouse white fly. A general 

 pest in greenhouses. 



COCCIDAE. Scale Insects 

 Xylococcus Morrison 



X. betulae (Perg.). Found on birch all the year. 



Crtptococcts Douglas 

 C. fagi (Baerj. Found on beech all the year. 



Lecanium Burmoister 



L. quercifex Fitch. Oak scale. Various parts of the Island 

 on red oak. 



Physokermes Targione-Tozzctt i 



P. piceae Schr. Spruce Bud-scale. Common on spruce. 



Aulacapsis Cockerel! 



A. rosae l>ouche. Hose scale. Bar Harbor on roses. 



Hemichionaspis Coekcrell 



II. aspedistbae Sign. Fern scale. Common on ferns under 

 cultivation. 



Lepidosaphes Shimer 



L. ULMi (Linn.). Oyster-shell bark scale. Common on ash, 



mountain nsli and willow. 



