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@. Z. Mayr. 
Aphilothrix Radicis, which has not been found in England, 
is attended in the gall by Synergus incrassatus, one of the 
inquiline Cynipide, or lodgers, whose presence in the galls is 
not in accordance with the welfare of the first inhabitants.— 
Francis Walker. 
Fig. 2.—BIoRHIZA APTERA. 
Biorhiza aptera.—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 
