THE ENTOMOLOGIST. 3 



Aphilothrix Radicis. — The gall produced by this species 

 is found on the roots of old oak-trees, near their junction 

 with the trunk, and is generally sparingly covered with earth : 

 in form it is almost spherical, but the surface is irregular, 

 and not unlike that of a potato ; in size the specimens differ 

 greatly, some being as small as a walnut, while others are 

 as large as a man's fist; externally it is very rough, and of a 

 dark brown colour; the interior is hard and woody, and 

 contains a considerable number of oval larva-cells. The 

 imago appears in April. — G. L. Mayr. 



Aphilothrix Radicis, which has not been found in England, 

 is attended in the gall by Svnergus incrassatus, one of the 

 inquiline Cynipidae, or lodgers, whose presence in the galls is 

 not in accordance with the welfare of the first inhabitants. — 

 Francis Walker. 



Fig. 2. — BlORHIZA APTEEA. 



Biorhiza opiera. — This species occurs on rootlets, which 

 vary in size from the quill of a raven to that of a goose, 

 and seems only to be found on oak-trees that have been 

 uprooted. It rarely occurs singly, and when this is the 

 case it varies in size from a pea to a cherry ; generally 

 several are clustered together in one spot on the root, in 

 which case all of them are flattened where they press 



