74 THE ENTOMOLOGIST. 
by intermediate forms. Dr. Giraud has described three of 
these varieties. The first variety, most frequently met with 
(the true C. glutinosa), is subglobular, and is about a centi- 
metre in diameter. Its base generally adheres so closely to 
the twig or petiole that these produce impressions on the 
gall. At the point opposite the base there is an umbilicated 
cavity. On the whole, the basal half of the gall is more 
swollen than the upper half. When fresh the gall is yellow 
or partly red, and more or less glutinous; when dry it is 
generally brownish yellow, and loses its stickiness. In 
section it exhibits a large cavity. The thin egg-shaped inner 
gall is here either attached to the base or to the point 
exactly opposite, but subsequently it sometimes appears 
quite detached. The second variety (C. coronata) has, on the 
whole, the fundamental form of the preceding. Its lower half 
is, however, surmounted with a crown of recurved, shorter or 
longer, projections. That part of the gall which lies above 
the crown of thorns and bears the umbilic in its centre is 
generally more swollen than in the galls of the first form, so 
that the umbilic is far less conspicuous. This gall is gene- 
rally of a lighter tinge, and far more glutinous and glossy. A 
section exhibits a thicker layer of moderately hard gall- 
substance and a smaller cavity, which sometimes occurs as a 
circular passage round the inner gall, thatadheres to the base by 
means ofa very short, or somewhat longer, pedicle. Itsometimes 
happens, however, that the inner gall has only a basal attach- 
ment, and still the cavity is present, although smaller than in 
the first form. The third variety (C. mitrata), in spite of its 
different outward appearance, is the same species, but without 
a cavity in the interior. The base has a flat extension, but 
it generally adheres so tightly to the twig that the base 
becomes strongly recurved. From this roundly swollen base, 
which in mature galls is about a centimetre in diameter, 
projects a cone ora thick style-shaped part, rounded at the 
end and strongly umbilicated. The surface is smooth, of a 
brownish red colour, and moderately glutinous. It shows no 
cavity in the section, the inner gall everywhere closely 
adhering to the gall parenchyma. A fourth form, which I 
have twice met with, may be placed under the last variety, 
C. mitrata. It differs, however, in having several excres- 
cences at its base, in its upper part forming a plain with 
