ANDRICUS GLANDIUM. 59 
to find the gall. The easiest way is by looking for a 
minute hole in an axillary bud. Adler, who was the 
first to discover this gall, says they are sometimes 
found free on the shoots (‘ Alternating Generations,’ 
p. 39); and Cameron says they may be found on the 
he - young leaves (‘ Brit. Phyto. Hymen.,’ vol. iv, 
p- 89). 
Andricus glandium, Giraud. 
(Plates VIII, IX, div. A.) 
oe glandium, Mayr, Cameron, Fitch, Mosley; A. rufescens, 
ayr. 
& ae names of gall.— The Acorn Gall,” “The Cotyledon 
all.” = 
Position of gall.—tIn the cotyledons (concealed by the pericarp). 
Manner of growth.—Glabrous, glossy, gregarious, con- 
glomerated. 
Colours.— White, cream, pink, brown. 
Average dimensions of a mature specimen.—Length, 
4mm.; breadth, 3 mm.; girth, 9 mm. 
May be sought during any month of the year. 
Growth is complete by the end of September. 
The typical condition of the gall is plurilocular, but unilarval. 
Usual number of cells about eight. 
The larva pupates in the gall. The imago emerges during the 
spring. Caieron says, “they take from three to four years to 
arrive at maturity.” 
Inquiline, No. 145. 
This gall is remarkable for the fact that although 
there may be many larval cells in an acorn, there is 
seldom any appreciable difference in the size of the 
acorn as compared with others not containing galls; 
consequently it is not until the pericarp is removed 
that the collector can be certain of having obtained 
them. The larval cells displace the same bulk of the 
cotyledons as they occupy; they are not embedded in 
them, and readily separate when the pericarp is 
removed. 
The shape of a mass of larval cells is sometimes 
