108 BRITISH OAK GALLS. 
their surroundings and are of the same texture: and 
colour. 
In the year 1897 M. W. Beyerinek (“Ueber di 
Sexuelle Generation von Cynips Kollari,” ‘ Marcellia,’ 
vol. i, p. 13) imprisoned a few imagines of C. Kollari 
on a young tree of @. cerris, and observed that 
they pierced the buds. Upon opening the buds, 
he found that a number of ova had been deposited. 
In October, 1901, the experiment was repeated, 
and in the following February there were signs 
of gall growth. By April galls of Andricus circulans 
had fully matured, and early in the following month 
imagines came out, which proved to be those of A. 
circulans. Further experiments were made with a 
like result—an enormous number of circulans galls on 
every twig of the experimental tree. 
He also found that out in the open, the galls of 
C. Kollart showed first indications of growth at the 
beginning of June, or about fourteen days later than 
the emergence of A. circulans. This he regarded 
as a further confirmation of the alliance, and alter- 
nating, of the two species. He was not able to get 
A. circulans to oviposit in Q. pedunciulata. He also 
believes that A. burgundus is the sexual form of 
C. tinetoria. 
Dryophanta agama, Mayr. 
- (Plate XL.) 
Cynips agama, Hartig; Dryophanta agama, Hartig, Miiller, 
Cameron, Fitch. 
English name of gall.—“< The Yellow Pea Gall.”’ 
Position of gall.—On the under-surface of the mid-rib and its 
offshoots. 
Manner of growth.—Single, glabrous, glossy, nodulose (incon- 
94 
i , oblate. \ 
spicuous), oblate Q het bon 
Colours.—Pale yellow, orange yellow, yellowish-brown. 
Average dimensions of a mature specimen.—Height, 4mm.; 
length, 5mm.; breadth, 4mm. 
May be sought during the months of June to August. 
Growth is complete by the end of August. 
