ERIOPHYIDyE OR GALL-MITES. 



31 



over upon itself until the middle of the bract is reached. When 

 thus all'ected, the bract may curve into a crescent shape, the roll itself 



Fig. S2.—Malfor7natioii. of the flower oftish (Fiaxinus excelsior) caused hii Eriopliycs fnixiiii. 



forming the inner margin of the concavity, or it may be otherwise 

 considerably distorted. No harm is done to the flowers, nor does the 

 bract fall until the usual time, hence the 

 mites are not destructive to the fruit." 



Eriophyes goniothorax (Nal.) 



This species is very common on the leaves 

 of the common hawthorn {Gratmgus Oxi/a- 

 cantlia). On healthy trees and hedges we 

 may only find an isolated affected leaf, but 

 sometimes on an isolated bush in a wood we 

 may find almost every leaf affected. The 

 damage itself is easily recognised, as the 

 outer edges of the leaf are rolled inwards, — 



the roll itself being very slender, and of cord-like api)earance. If 

 fresh leaves are gathered, and kept in a box or on a table until they 



Fig. 33. — Edges of hawthorn leaf 

 rolled inimrds by Eriophyes 

 goniothorax. 



