294 
The Ohio Naturalist. 
[Vol. XIV, No. 6, 
Tilia americana. Leaf Gall. Gall maker, undetermined. 
A monothalamous, fusiform hypertrophy at the base of the 
petiole, 10 mm. long, 5 mm. wide. Surface and color same as 
the normal petiole base. Texture tough, almost woody. Cham¬ 
ber, elongate, narrow, flattened lying centrally. A single white 
larva present. Fig. 21. 
Vitis aestivalis. Leaf Gall. Gall maker, an undetermined insect. 
^ A small, monothalamous, sub-cylindric gall, extending both 
sides of the leaf. Hairy on both sides with reddish brown hairs 
below, lighter above. 2-3 mm. Walls rather thick. Pupa 
present July. Not common. Fig 22. Plate II. 
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