On leaf, under side, rather large, pouch-like gall (5-6 mm. long)
arising from a principal vein. Shaped like a stout gourd, it is bent
over nearly recumbent against the blade of the leaf. 2-2½ mm. wide. The
proximal end is sharply constricted at the minute point of attachment.
The walls when collected were light brown in color, sparsely covered
with short white hairs. Walls very thin and when dry brittle. Interior
surface smooth. Inconspicuous on the upper side of the leaf, except for
the minute pore next the vein. Two specimens from the same leaflet.
This gall differs so markedly from all the other cecidomyidous galls
of the hickories, that I am not certain just where to place it. They
contained no occupants of any kind.
Collected in Hocking County, Ohio, on _H. glabra_, July.
Type specimens at Ohio State University.