ANDRICUS GLANDTU:\[. 59 



to find the gall. The easiest way is by looking for a 

 minute hole in an axillary bnd. Adler, who was the 

 first to discover this gall, says they are sometimes 

 found free on the shoots (' Alternating Generations,' 

 p. o9) ; and Cameron says they may be found on the 

 apex of young leaves ('Brit. Phyto. Hymen.,' vol. iv, 

 p. 89). 



Andricus glandium, Giraud. 

 (Plates VIII, IX, div. A.) 



Andricus (jlandium, Mayr, Cameron, Fitch, Moslev ; A. rufescens, 

 Mayr. 



English names of gall. — " The Acorn Grail," " The Cotvledou 

 Gall." 



Position of gall. — In the cotyledons (concealed by the pericarp). 



Manner of growth. — Glabrous, glossy, gregarious, con- 

 glomerated. 



Colours. — White, cream, pink, Iwown. 



Average dimensions of a mature specimen. — Length, 

 4 mm. ; Ijreadth, 3 mm. ; girth, 9 mm. 



May be sought during am- 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. Cameron says, " they take fr(>m 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 peiicarp is 

 removed. 



The shape of a mass of larval cells is sometimes 



