List of the Insect Fauna of the County. 139
Quercus Robur, L. Bud. The well-known oak-, or King
Charles', apple, is a spongy textured, whitish or rosy, almost
spherical gall, occurring commonly on the terminal buds in
May and June ; it varies in size, from that of a pea to a
Fig. 30. Andricus terminalis
medium-sized apple. The gall is many-celled, and is mature
early in June, when the gall-flies emerge therefrom. Andricus
terminalis, Fabricius. (Fig. 30.)
Quercus Robur, L. Bud. This gall has the appearance
of a terminal swelling of the young oak shoots, but is truly a
bud gall, although axillar
buds and leaves are produced
from its surface. In section
the gall shows the surround-
ing woody growth, with an
elongate apical cavity, at the .
base of which we find the
single, brown, ovate larva-

cell. The gall is mature

Fig. 31. Andricus inflator.
in spring, and the gall-fly

emerges therefrom in June.

Andricus inflator, Hartig.
(Fig. 31.)
Quercus Robur, L. Leaf. Small, reniform, green or red,
succulent, but not soft, galls, occurring on the under side of
the side veins and midribs of the leaf, from which, when
mature, they are very easily detached. They occur in