106 THE EEPOET OF THE No. 36 



Host — Elm. 



Eriophyes ulmi (Garman). Small green to yellowish pocket-galls, more or 

 less spherical, usually on the upper side of the leaves. Elm Pocket Gall. (Fig. 34.) 

 Ulmus americana and U. racemosa. T. D. J., Guelph. 



Eriophyes sp. An erineum on the undr-r side of the leaf; white at first, chang- 

 ing to brown. Trichomes simple, tangled. Rock Elm Erineum Gall. Ulmus 

 racemosa. T. D. J., Guelph. 



Eriophyes sp. A very large pouch-gall on the leaves, commencing as a cone 

 or deep dimple. (Fig. 35.) Ulmus pubescens. T. D. J., Guelph. 



Host — Grape. 



Eriophyes sp. A white erineum on the underside of the leaf, Trichomes 

 simple. Wild Grape. T. D. J., Guelph. 



Eriophyes sp. Small, semi-circular or nearly circular capsules along the 

 veins, about 2 mm. in diameter, and but slightly elevated on either surface. On 

 upper surface paler than the leaf; below, with a white nipple surrounded by a 

 furrow. Yitis cordifolia. T. D. J., Guelph. 



Host — Hawthorn. 



Acarus craiaegi vermiculus. A fold of the leaf making long, irregular, wavy 

 projections on the upper surface of the leaf. From the midrib to the edge of the 

 leaf in the general direction of the gall. Serpentine Gall. Crataegus sp. T. D. J., 

 Guelph. 



Eriophyes sp. Small, round swellings (capsules) protruding very slightly on 

 both sides of the leaf. About .5-1 mm. in diameter. Galls very numerous where 

 they occur — sometimes more than 100 on a single leaf. Speck Gall. Crataegus 

 sp. T. D. J., Guelph. 



Eriophyes sp. Very small, monothalmous, conical structures, 1 to 3 mm. 

 high and 1-1.5 mm. wide at the base; formed anywhere on either surface of the 

 leaf and sometimes on the stem of young twigs. Cone Gall. Crataegus sp. 

 T. D. J., Guelph. 



Host — Hazel. 



Eriophyes sp. This gall is found only along the main veins of the leaf. The 

 part of the leaf around the affected portion of tbe vein becomes crimped, the crimps 

 all radiating towards the vein as a common centre. Hazel Leaf Crimp Gall. 

 Corylus americana. T. D. J., Guelph. 



Eriophyes avellanae. A bud deformation, which attacks bud as soon as it ex- 

 pands, and checks its subsequent development. Hazelnut Bud Gall. Corylus 

 americana. T. D. J., Guelph. 



Host — Genus Juglans. 



Eriophyes sp. A brown, velvety erineum surrounding the leaf stalks, or on 

 the main veins, causing a swelling or bending of the stalk or vein. "Walnut 

 Cushion Gall. Juglans nigra and probably J. cinerea. T. D. J., Guelph. 



Eriophyes sp. A green pocket-gall on the upper side (usually) of the leaf. 

 Walnut " Wart " Gall. Juglans nigra and probably J. cinerea. T. D. J., Guelph. 



