List of the Insect Fauna oj the Countij, 



148 



March. Neuroterus lenticularis, Olivier (Fig. 37) [agamous 

 form of Spathegaster baccarum] . 



Fig. 37. Neuwterua lotticularis. 



Quercus Robur, L. Leaf. This spangle-gall greatly re- 

 sembles the common spangle-gall last described, but in shape 

 it is raised from the sm-face 

 of the leaf at its margins ; 

 it is reddish or pm-plish in 

 colour, and does not gene- 

 rally occur in such im- 

 mense numbers on a leaf. 

 The gall-fly emerges Irom 

 the fallen gall in March. 

 Neuroterus fumipennis, 

 Hartig(Fig. 38) [agamous 

 form of Spathegaster tri- 

 color] . 



Quercus Robur, L. Leaf. Another closely -allied spangle- 

 gall. It differs from the common species in shape, and in 

 being smaller and of a more yellowish or cream-colour ; it is 

 a concave disc, with a small raised knob in the centre. The 

 accompanying figures of 



Fig. 38. Neu)'oteru>i fumiijeniiis 



an imaginary section of 

 each of these three closely- 

 allied spangle galls will 

 help in their differentia- 

 tion. In Fig. 39, a. repre 



<^^-^ 



M, 



13. 

 Fig. 39. 



sents N.fumipennis, i3. .V. Iwvmscaliis, and y. N. lenticularis. 



