PLATE 19 



282 Eriophyes species on poplar. 



262 Rhabdophaga salicifolia Felt, spiraea. 



134 Pemphigus vagabundus Walsh, poplar. 



235 Honnoniyia canadensis Felt, shad-bush. 



261 Dasyneura rosaruni Hardy, rose. 



48 Hormomyia canadensis Felt, shad-bush. 



38 Eriophyes on willow. 



97 Eriophyes or fungus on Rhus copallina. 



265 Cecidomyia, not reared, on witch-hazel. 



[104] 



