72 BRITISH OAK GALLS. 
Concerning Inquilines from this gall, Cameron says: 
“ Synergus apicalis and Ceroptres arator are supposed 
to be reared from the galls of testaceipes, but they 
really may have been from those of noduli, the petiole 
galls of which may have been mistaken for those of 
testaceipes’ (‘ Brit. Phyto. Hymen.,’ vol. iv, p. 87). 
Considerable doubt seems to exist in the minds of 
some authors as to whether this species is, or is not, 
the same as Andricus nodult. The habits of both 
species are much alike; the galls of each are the same 
in size and shape and develop in stem and petiole 
alike, Andricus testaceipes alone, apparently, on the 
veins of the leaf. 
According to Adler the imagines cannot be distin- 
Fie. 6.—Galls caused by Andricus testaceipes, on petiole and mid-rib of 
leaf of Q. sessiliflora. dele. ad nat. E.C. 
guished with certainty from each other, their time of 
emergence is identical, and they oviposit in the same 
manner. Mayr conjectured as to whether petiolar 
galls containing a larva of Andricus nodult were 
originally produced by A. testaceipes, and A. nodult 
has only introduced its eggs, or whether the galls are 
primarily produced by A. noduli alone. Although he 
gathered hundreds of these galls in the months of 
August and September he could not solve the 
problem. 
Adler’s experiments show that the imagines from 
the galls in leaf-veins and petioles, known as those of 
Andricus testaceipes, lay their eggs in shoots above 
ground and produce Aphilothrix Sieboldi galls, which, 
although gregarious, are unilocular ; and the imagines 
