74: BRITISH OAK GALLS. 
here given. Care must be exercised when severing 
the twig on which they are growing. They are easily 
dislodged, and having fallen to the ground are seldom 
recoverable. In the cabinet also care must be taken 
in handling them. They are usually quite solitary, 
i.e. not more than one on a twig. Occasionally two 
may be found near each other, and one twig I found 
had three within a distance of 33 mm., each growing 
from lateral buds. 
A large proportion of these galls will be found to 
be quite empty. They are usually situated on the 
smallest twigs, sometimes in company with Andricus 
solitarius. 
Its growth is rapid. When the gall bursts through 
the bud scales it is usually green in colour, with very 
few or no spots upon it. The exterior consists of a 
somewhat thick soft rind which shrinks in thickness 
a great deal as the gall nears maturity; beneath this 
are the cell walls, which are thin. The larval chamber 
is large and occupies the entire cavity. As growth 
proceeds cream-coloured or pale-yellow spots appear 
in the rind, elliptical in shape, and extending in a 
longitudinal direction. 
Numerous (15-20) furrows traversing the length of 
