NEUROTERUS LENTICULARIS. 121 
of the young and tender leaf, is a number of minute 
pimples, which rapidly enlarge to small yellowish-green 
discs closely adhering to the leaf, but attached only 
by the delicate and small pedicle peculiar to the 
lenticular galls. It soon attains its maximum propor- 
tions. The gall structure retains its yellowish-green 
ae  _—s WE 
A. B. Cc. 
Fie. 15.—Diagrammatic sectional outlines of galls caused by: a. 
Neuroterus lenticularis. 3B. N. fumipennis. c. N. leviuseutus. 
All x 4, dele. ad nat. E.C. 
colour, but it is concealed by a dense covering of 
radiating stellate hairlets of an orange-red or reddish- 
brown colour. 
The periphery is circular, the rim slightly curved 
upwards; in the centre is a small obtusely conical 
elevation. The under-surface is almost flat, with a 
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Fie. 16.—Section of leaf, and a mature gall caused by Neuroterus 
lenticularis showing tissues and stomata in leaf; larval chamber 
(in centre), and stellate hairlets on lower margin of the gall. 
x 18. In part, after Beyerinck. dele. E.C. 
few whitish spots near the margin, and but few hair- 
lets. — 
These galls are scattered all over the under-surface 
of the leaf, but very rarely attached to the mid-rib, or 
its offshoots. The upper surface exhibits minute pale 
yellowish spots corresponding to the point of attach- 
ment. 
