NEUKOTERUS LENTICULARIS. 



121 



of the young and tender leaf, is a number of minute 

 pimples, wliich rapidly enlarge to small yellowisli-green 

 discs closely adhering to the leaf, but attached only 

 by the delicate and small pedicle peculiar to tlie 

 lenticular galls. It soon attains its maximum propor- 

 tions. The gall structure retains its yellowish-green 



B. 



C. 



Fig. 15. — Diagi-ammatic sectional outlines of g-alls cansed by : a. 

 NeiiToterus lenticularis. b. A", fumijjennis. c. N. Iseviusculus. 

 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- 

 Ijrown 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 



Fig. 16. — Section of leaf, and a mature gall catxsed by Neitrotents 

 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. EC. 



few whitish spots near the margin, and but few liair- 

 lets. 



These galls are scattered all over the under-surface 

 of the leaf, but very rarely attached to the mid-ril), or 

 its offshoots. The upper surface exhibits minute pale 

 yellowish spots corresponding to the point of attach- 

 ment. 



