Plate A. 



1. Vein Gall of White Ash. Eriophyes .y). 4. Manitoba Maple Wart Gall. Erioplvirx s^p 



2. Chokecherry Mite Gall. Erioplu/i'S xp . 5. Poison Ivy Mite Gall. Eriophyes sp. 



3. Hawthorn Serpentine Gall. Eriophyes i<p . 6. Birch Bud-Gall. Eriophyes sp. 



(See page 56.) 



[vii.l 



