Plate D. 



1. Eriophyes sp., Amelanchier Canadensis. 



2. Eriophyes sp., Jnglans nigra. 



3. Eriophyes sp., Populus italica. 



4 . Eriophy es'sp . , Vitis cordif olia . 



.5. Eriophyes sp., Salix fragilis. 



6. Young Oyster-sliell scales parasitized 



bv a fungus. 



7. Curtis scale parasitized by a fungus. 



