60 BRITISH OAK GALLS. 



ellipsoidal, Init mostly the outline is irregular. A 

 solitary larval cell, however, is ovoid in shape. It 

 measures 8 mm. long and 2 mm. broad. The walls 

 are thin. The interior is white or very pale-green or 

 yelloAv, and slightly glossj^ The exterior is brown, or 

 reddish-brown. 



This gall was discovered on Q. cerru in Kew gardens, 

 in the year 1877, by Miss E. A. Ormerod, LL.D. I 

 believe I was the first in Britain to find the galls on 

 trees groimig ivild .- 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. jpedunculata 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 

 larviB 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 glandulae, Mayr. 

 (Plate X.) 



Cynips (jJandulu?, Scheuek ; Aplnlothrix yJandtihe, Mayr, Hartig, 

 Fitch ; Andricus glandidie, Cameron. 



English names of gall.—" The Thatched Gall," " The Little 

 Acorn Gall." 



Position of gall. — In the axillary leaf bud. 



Manner of growth. — Solitarv, pedunculated, pubescent, glossy, 

 longitudinally grooved. 



