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. 
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 cccidia 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. Ceeidomyia sp.” The galls, how¬ 
ever, are scattered over the leaf blade. 
Betula lenta. Leaf Gall. Gall maker, undetermined. 
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 and color of the normal vein. 
Tubular cavity small. Larvae not found. Not common. Fig. 4. 
