Plate A. 



1. Vein GaiJ on White Ash. Eriophyes sp. 



2. Chokecherry Mite Gall. Eriophyes sp. 



3. Hawthorn Serpentine Gall. Eriophyes 



4. Manitoba Maple Wart Gall. Eriophyenyp. 



5. Poison Ivy Mite Gall. Eriophyes sp. 



6. Birch Bud Gall. Eriophyes sp. 



[133] 



