110 BRITISH OAK GALLS. 
The texture of the gall is hard, but the walls are 
thin ; and the larval chamber very large. The exterior 
is rarely suffused with pink or red. This forms one 
external distinguishing feature from D. divisa, which is 
pink during the greater part of its growth. Both 
species are about the same size, but divisa is generally 
shghtly larger. Both, also, frequently have flat, 
reddish-brown, very small nodules scattered over the 
exterior. 
This gall was first observed in England about forty 
years ago, the imagines having been reared by Albert 
Miller and recorded in ‘ Proc. Ento. Soc. Lond.,’ 1870, 
XXXIV. 
Although an alternate generation does not appear to 
be known, the fact that the imago does not normally 
pass the winter in the gall, would indicate that a sexual, 
or spring form, may exist. 
Dryophanta disticha, Hartig. 
(Plate XLI.) 
Cynips disticha, Hartig, Schnk.: Aphilothrix disticha, Mayr ; 
Andricus disticha, Mayr; Dryophanta disticha, Mayr, Cameron. 
English name of gall.— ‘The Two-Cell Gall.” 
Position of gall.—On the under-surface of the mid-rib and its 
offshoots. 
Manner of growth.—Single, glabrous, slightly glossy, unique 
in form. 
Colours.—Yellowish-white, pale yellow, light brown, reddish- 
brown. 
Average dimensions of a mature specimen. — Height, 
4mm.; length, 6mm.; breadth, 4mm. 
May be sought during the months of July to September. 
Growth is complete by the end of August. 
The typical condition of the gall is bilocular but unilarval. 
The larva pupates in the gall. The imago emerges during 
the autumn. 
Parasites, Nos. 19, 44, 46, 47, 59, 64, 105, 112, 114, 117, 120, 
150, 151, 154, 180, 183. Inquilines, Nos. 127, 134. 
In some districts this gall is exceedingly rare. 
Nowhere does it appear to be plentiful. Only very 
