22 BRITISH OAK GALLS. 
Beyerinck to contain about 800 ova. It is quite 
certain, however, that she seldom, if ever, lives to 
deposit so many. Single galls of Aphilothrix 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 subject. The following 
are amongst the most noteworthy examples of which a 
record has been kept : 
Length of leaf Breadth of leaf Number of 
Galls of exclusive of from tip to tip galls on 
petiole. of widest lobes. the leaf. 
Dryophanta divisa. 11 cm. . 62 cm. . 82 
» - 10 ei. xe, OPAC. “ss . d4 
Neur onaries ostreus . 12:2 ,, 8 ra 27 
” 2 85 a8 a] ? 28 
20° 9s 9°4 ” 6 ” 3l 
a ow ow LD CO a 42 
Biorhiza renum =. 12'3_—==", 8 me 32 
” ” 7 LE 38 ” 33 
a 7) 72 ” Ad8 ” 35 
= a 116 ,, 68, 48 
” ” 14 ” 7 ” 48 
3 . 68 ,, 420 ,, 51 
Neuroterus Te 
matis . 9 se. oe We a 358 
7 a de MOBS 35. a 32 - 465 
i » « AOS 4, Ove 518 
8 yw « DA 4 Do ys 609 
” 9 . 14 ” 9 ” 681 
158 ,, - 10: dre . 698 
(See also description of same - species.) 
