APHILOTHRIX RADICIS. 93 
when above ground. I have observed that when 
situated on the trunk, or a branch, the majority of 
single growths (i.e. like that in Plate XXX, div. A), 
approach a reniform or an oval shape, and are sessile. 
Such a specimen may be regarded as the result of the 
oviposition of but one imago, whereas that in the lower 
half of Plate XXVI, being due to several, perhaps four, 
imagines. 
The size, likewise, differs considerably, varying from 
that of a marble to upwards of 30 cm. at greatest 
girth. 
The gall appears in September and continues grow- 
ing for some weeks. About November it ceases to 
grow until the spring, when formation is resumed, and 
by the end of the summer it ismature ; the larvee then 
pupate and remain in that condition through. the 
winter, the imagines coming out about April. During 
formation the gall is succulent, of the consistence of a 
potato, more or less smooth externally and slightly 
glossy; when nearing maturity it becomes firmer, and 
finally hard and woody. Small and medium size 
aérial specimens usually have about half their surface 
deeply furrowed, producing elevations of irregular 
shape, size, and height, and mostly pointed. 
The larval chambers are exceedingly numerous. 
They are normally globular in shape, about 3 mm. in 
diameter, with thin, hard, and woody walls, firmly 
affixed to each other in a somewhat concentric pattern, 
and occupying the centre of the surrounding tissue. 
After the gall has arrived at maturity this tissue 
undergoes various changes. It loses much of its solid 
nature, becomes soft and open in texture, thus offering 
little resistance to the imagines in eating their way to 
the exterior. Finally it decays away, leaving the 
tenantless larval chambers in a conglomerated con- 
dition, whitish in colour, and adherent for some time. 
The colour is regulated according to situation. 
Below ground it is white, or dirty white, sometimes 
with a rose tinge; beneath leaves or moss it is suffused 
