Galls caused by the larvae, nymphs, and imagines 

 of Eriophyes goniothorax Nal. 



the leaves of Crataegus Oxyaoantha Linn. 



PLATE 53. 



Synonymy of Mite. 



Erineum cla7idestinum Gerv. 



„ oxyacanthcE Vail., Amer., Murr. 

 Phytoptus goniothorax Nal. 



Habitat of the Hawthorn. — In woods and thickets 

 throughout Britain ; also forming artificial hedges by the 

 sides of railways, roads, and lanes. 



Position of the Galls. — On the edges of the lobes of the 

 leaves. 



Manner of Growth.— The edge of the lobe curls downwards 

 and under. 



Colour. — Variable, but usually paler than the other part of 

 the leaf 



Average Dimensions of a Mature Specimen. 

 Length, lo mm. ; breadth, i mm. 



May be sought during the months of May to November 



The Growth is complete by the end of September. 



The galled edges are more easily seen when the leaf is looked 

 at from below than from above. Two opposite edges which 

 are attacked will roll towards each other until they meet and 

 transform the lobe into a small spike. It is not often that more 

 than ten lobes of a leaf are attacked ; the usual number is si.K. 



The gall is also figured by Nalepa, " Beitrage zur Systematik 

 der Phytopten," Taf ix. 



The illustration is of specimens gathered at Eastbourne by 

 the author. 



138 



