Galls caused by the larvae, nymphs, and imagines of 

 Eriophyes tetratrichus Nal. 



on 



the leaves of Tilia europaea Linn. 

 PLATE 67. 



Synonymy of Mite. 



Legnon crispuni Bremi. 

 Phytoptus tetratrichus Nal. 



Habitat of the Common Lime-tree. — This tree occurs 

 throughout Britain in woods, parks, avenues, etc. It is 

 profuse in its foliage and flowers, and assumes handsome 

 and noble proportions. 



Position of the Galls. — Around the margins of the leaf. 



Manner of Growth.— A rolling and slight thickening of the 

 edge, which may extend all round the leaf 



Colour. — Green, orange-yellow, reddish brown. 



Average Dimensions of a Mature Specimen. 

 Length, 30 mm. ; breadth, i^ mm. 



May be sought during the months of June to October. 



The Growth is complete by the end of August. 



The serrations on the edge of the leaf are first attacked by 

 these mites, causing them to curl upwards and to bend over 

 until they touch the upper surface of the leaf The rolling is 

 continued until it has extended all round the leaf, and also 

 until but a small portion remains in the centre, which is much 

 pouched. The exterior of the roll is slightly pubescent, the 

 interior very pilose. The apparently small leaf in nearly the 

 centre of the illustration was originally the size of that next 

 below it. The crinkled appearance of the leaves is due to 

 shrivelling before being photographed. 



The illustration is of specimens gathered at Aylsham, 

 Norfolk, by the author. 



166 



