22 



BRITISH OAK GALLS. 



Beyerinck to contain about 800 ova. It is quite 

 certain, however, that she seklom, if ever, lives to 

 deposit so many. Single galls of Apliilothrix radicis 

 commonly contain 60 to 80 larval cells, and not 

 infrequently 120 to 150. The gall, of which half is 

 shown in Plate XXVI, div. A, contained 180 cells. 

 A most careful examination of the gall, and the spot 

 from whence it developed, failed to show that it was 

 due to the energies of more than one insect. 



Ova are more abundant in the species which cause 

 autumn galls than in those which cause summer galls. 

 The numerousness of autumn galls on leaves is very 

 remarkable, much more so in some years than in others. 



For several autumns the author has given some 

 attention to this phase of the sul^ject. The following- 

 are amongst the most noteworthy examples of which a 

 record has l)een kept 



(See also description of same species.) 



