CHAPTER II. 



Description of the Species of Cynipidae observed, with a view 

 TO determining their Alternation of Generations. 



I. Neuroterus Group ^. 



1. Neuroterus lenticularis. 01." 



Gall. The gall appears on the under surface of the 

 oak leaf, and occurs frequently in large numbers, forty 

 to fifty on one leaf. It is circular, 4-6 mm. in diameter; 

 the under surface which is in contact with the leaf is 

 smooth and flattened, and of a whitish colour; the upper 

 surface has a slightly conical prominence in the centre, 

 and is of a pale yellow or reddish colour with brown 

 stellar hairs. The galls appear in July, mature in 

 September, and fall to the ground at the end of 

 September or beginning of October. (Fig. i.) 



Rearing the Fly. The mature galls are collected at 

 the time when they begin to detach themselves from 

 the leaves. The larva, which may be seen lying in 

 a small cavity in the centre of the gall, is still very 

 minute and requires a certain degree of moisture for 

 its further development. The galls should therefore be 



[1 Nettrotents, Hartig; Spathcgaster, Hartig ; Ameristus, Foerster; 

 Manderstjernia, Radoszkowsky. 



^ Cynips lenticulatis, Olivier ; Neuroterus Malpighii, Hartig, Tasch., 

 Thorns.] 



