Galls caused by the larvae, nymphs, and imagines of 

 Eriophes marginatus 



on 



the leaves of Salix alba Linn. 



PLATE 58. 



Habitat of the White Willow.— By the side of streams, 

 in marshes, and in hedges around damp meadows. Common 

 all over Britain. 



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



Manner of Growth.— Singly ; glabrous ; sessile. 



Colour. — Pale green, greenish yellow, orange-yellow, red, 

 brown. 



Average Dimensions of a Mature Specimen. 

 Height, I mm. ; length, 3 mm. ; breadth, i mm. 



May be sought during the months of June to October. 



The Growth is complete by the end of August. 



These galls often have the appearance of being attached to 

 the margin of the leaf by a short peduncle ; they are, however, 

 sessile. They rarely coalesce, but the ends of several when 

 close together meet, and cause the margin of the leaf at that 

 part to curl considerably. They vary in number from two or 

 three to fifteen on one leaf, and are always situated on the 

 margins. The oldest and largest leaves seem to be less liable to 

 attack than those younger and near the end of the twig. They 

 appear to be very local, and are not plentiful where they occur. 



The illustration is of specimens gathered at Hastings by 

 the author. 



148 



