290 The Ohio Naturalist. [Vol. XIV, No. 6, 



The galls herein described and believed to be heretofore unre- 

 ported, are arranged on the basis of the plant affected. The plant 

 genera are arranged alphabetically, Gray's Manual being followed 

 in the matter of nomenclature. 



Acer saccharum. Leaf Gall. Gall maker, not found. 



A small, monothalamous, laterally flattened gall on the under- 

 side of the leaf veins. 3-4 mm. dia. Semicircular in outline as 

 seen from the side. The vascular tissue traverses the edge of the 

 gall. Gall opens above by a slit which is bounded by definite 

 lips. No pubescence present. Green in summer, brown in dried 

 condition. Fig. 1. 



^t5- 



Amelanchier canadensis. Leaf Gall. Gall maker, not found. 



A small, monothalamous, smooth, cone-shaped gall, promi- 

 nently curved at the tip, occurring on cither side of the leaf. On 

 the side opposite the gall is a short narrow slit, definitely lip- 

 bordered, which leads into the small chamber. In mid-summer 

 the galls are yellowish at the base to red or brown black at the tip. 

 Under lens the surface is finely striate. No pubescence. When 

 found they occur in great numbers on the leaves of the shad-bush, 

 where they are distributed heterogeneously ; bearing no relation 

 to the venation system. Common locally. Fig. 2. 



Possibly the gall described by Hagen (33) and Chadwick (22) 

 as "similar to a Phrygian cap, the tip rolled down; on the upper 

 side of the leaf, rarely below." 



Amelanchier canadensis. Leaf Gall. Gall maker, unknown. 



A flattened, monothalamous, pocket gall occurring in numbers 

 on the underside of the leaf. 3-4 mm. long. Distal edge toothed, 

 rarely more than three pointed. Ivory white, smooth as tho 

 polished. Cavity confined to the proximal two thirds of the gall. 

 Wall smooth. Opens on the opposite or upper side of the leaf by 

 a narrow slit sunken in a depression of the blade. Galls are locally 

 abundant. 



Undoubtedly an insect gall, whose larva) leave the cecidia by 

 mid-summer. The material described was collected in Aug. and 

 showed no inhabitants of any kind. Fig. 3. 



Possibly the same as Felt's (29) "flattened, white, pouch gall 

 on leaf margin, denticulate. Cccidomyia sp." The galls, how- 

 ever, are scattered over the leaf blade. 



Betula lenta. Leaf (jail. Gall maker, undctennined. 



A monothalamous, closed vein gall on the principal veins of 

 the leaf. 5-10 mm. long, often merging into each other. Narrow, 

 not over ^^ mm. wide. Smooth ancl color of the normal vein. 

 Tubular cavity small. Larvae not found. Not common. Fig. 4. 



