List of the Insect Fauna of the County. 



141 



it ripens in September or October, and the gall-flies emerge 

 in late autumn. Dryophanta scutellaeis, Olivier, or 



Fig. 34. Dryophanta HcuteUaris or D.folif 



D. FOLii, Linne (Fig. 34) [agamoiis form of Spathegaster 

 Taschenbergi] . 



QuERcus RoBUR, L. Leaf. 

 This gall is almost spherical, 

 slightly depressed at the top 

 and bottom, glossy, smooth, 

 yellowish or reddish in colour, 

 and occurs mostly in numbers 

 on the under side of the leaf. 

 It is about the size of a tick 

 bean, and is single-celled, but 

 the larva-cell is very large 

 relatively to the size of the 

 gall. This peculiarity and its 

 much harder consistency dis- 

 tinguish it at once from the 

 previous species, of which it 

 is only about half the size, 

 and is much more gregarious 

 than D. smitel Jan's (foUi). The 

 galls occur in summer, and are 

 mature in early autumn, but Fig. 35. Dryophanta divisa. 



35a 



