PLATE 17 



277 Andricus rileyi Ashm., oak. 



209 Cecidomyia species, Cornus. 



236 Unknown, on oak. 



273 Callirhytis papillatus 0. S., chestnut oak. 



53 Eriophyes on plum. 



305 Andricus lana, oak. 



283 Cecidomyia balsamicola Lintn., balsam fir. 



21 (?) Mycodiplosis populifolia Felt, poplar. 



318 Chermes abietis Linn., spruce. 



[100] 



