On leaf, under side, a gall similar to 7, perhaps a variety of it,
though its prominent and constant differences would indicate a distinct
species. Conic with rounded base and truncate tip, 4-6 mm. high, 3-4
mm. broad in widest part. The wall at the tip thin, splitting into a
fimbriate condition. Attached by a minute central pedicel, no trace of
a saucer-shaped structure developing around the base. Galls greenish
to red and purple tinted. Uniformly being covered with sparsely
distributed short hairs. Interiorly two chambered, the larval chamber
proximal and occupying nearly one-half of the gall. Walls including the
partition comparatively thin. Surface of leaf opposite gall slightly
raised with reddish tint.
Collected in Athens County, Ohio, on _H. alba_, August.
Type specimens at Ohio State University.