172 



HYMENOPTEEA (GALL-FLIES). 



Cynipidse. Some are parasitic on Diptera and others on 

 Aphides. Oak apples are formed by Gynips Jcollari (a) and 

 Briorhiza terminalis. The Bedeguar or mossy galls on the rose, 



Fig. 75. — Cynipidjs. 



A, Galls of Cynips kollari ; c, maggot ; a, hole of escape of fly ; &, gall attacked by 

 tits. D, larva, e, pupa. F, imago, e, ova of Briorhiza terminalis. (The ova are from 

 prejiarations sent me by Mr Hammond.) 



by Ehodites rosce,^ are examples. The greatest numbers are 

 found on the oak, a few on the rose and other plants. Tits, 

 especially the Blue and Great Tits, peck the grubs out of these 

 galls in great numbers. 



^ According to the late Mr Ashmead, the farmers at Harrogate gather 

 these galls to make an infusion for the cure of diarrhoea in cove's (Miiller, 

 Zool. S. S., p. 1206). 



