60 BRITISH OAK GALLS. 
ellipsoidal, but mostly the outline is irregular. A 
solitary larval cell, however, is ovoid in shape. It 
measures 3 mm. long and 2 mm. broad. The walls 
are thin. The interior is white or very pale-green or 
yellow, and slightly glossy. The exterior is brown, or 
reddish-brown. 
This gall was discovered on Q. cerris in Kew gardens, 
in the year 1877, by Miss EH. A. Ormerod, LL.D. I 
believe I was the first in Britain to find the galls on 
trees growing wild: In the first instance in acorns 
that had fallen from a tree of Q. cerris, in Sir A. Lamb’s 
park, at Beauport, near St. Leonards, in the spring of 
1902, in considerable numbers; and then in a growing 
condition on the same tree in the autumn. From that 
tree, and others of the same species, in the same park, 
I have obtained galls each year since. In the same 
spring I also found the same galls in acorns on the 
ground, and in other acorns still attached to the twigs 
of a tree of Q. pedunculata in a wood at Hollington, 
also at St. Leonards, but not in such numbers. The 
two trees are, in a direct line, about three miles apart. 
When acorns are kept under artificial conditions the 
larvee delay their pupation for several years. I now 
(May, 1908) have some that have been in the larval 
state for six years. Parasites (species undetermined), 
however, have appeared the summer following from 
galls gathered from a tree in the previous autumn. 
Andricus glandule, Mayr. 
(Plate X.) 
Cynips glandulx, Schenck; Aphilothriz glandulx, Mayr, Hartig, 
“Fitch; Andricus glandula, Cameron. 
English names of gall.—< The Thatched Gall,” “The Little 
Acorn Gall.” 
Position of gall.—In the axillary leaf bud. 
Manner of growth.—Solitary, pedunculated, pubescent, glossy, 
longitudinally grooved. 
