Galls caused by the larvae, nymphs, and imagines of 

 Eriophyes tiliarias 



on 



the flower-bracts of Tilia enropaea Linn. 



PLATE 69. 

 Synonymy of Mite. 



Phytoptus tiliarius Mur. 



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.— On the margin of the flower-bract. 



Manner of Growth. — Separately; sessile; slightly pubescent. 



Colour. — Green, suffused with red and reddish brown. 



Average Dimensions of a Mature Specimen. 

 Length, 20 mm. ; breadth, 2 mm. 



May be sought during the months of June, July, and August. 



The Growth is complete by the end of July. 



These galls begin to form on the margin of the bract as small 

 elevations. The feeding of the mites causes the edge of the 

 bract to rise upwards and curl over towards the mid-rib, pro- 

 ducing a roll which sometimes extends 30 to 40 mm. in length, 

 and continues to roll over upon itself until the middle of the 

 bract is reached. When thus affected the bract may curve 

 into a crescent shape, the roll itself 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. 



The gall is also figured by Murray, "Economic Entomology," 

 P- 356. 



The illustration is of specimens gathered at Aylsham, 

 Norfolk, by the author. 



170 



