Galls caused by the larvae, nymphs, and imagines of 

 Eriophyes tiliae (typicus) Nal. 



on 



the leaves of Tilia europaea Linn. 



PLATE 68. 

 Synonymy of Mite. 



Ceratoneon extensum Bremi. 

 Phylleriuni {Erineum) tiliaceum Pers. 

 „ „ nervale Kunz. 



Eriophyes tilia (typicus) Pgst. 



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 upper surface of the leaf. 

 Manner of Growth. — Gregarious ; glabrous ; glossy ; conical. 

 Colour.— Greenish yellow, red, crimson, purple, brown. 

 Average Dimensions of a Mature Specimen. 



Height, 8 mm.; girth, 6 mm. at base. 

 May be sought during the months of June to October. 

 The Growth is complete by the end of July. 



These galls never fail to arrest the attention of the gallist. 

 The shape, the various colours, and the large numbers, all com- 

 bine to render them very conspicuous. They are known as the 

 " nail-gall," and look very like the points of a number of tacks 

 projecting through the upper surface of the leaf. They are 

 hollow, the interior containing a quantity of long hairs, amongst 

 which the mites swarm in considerable numbers. An average 

 size leaf may have as many as 150 galls upon it, and yet be 

 free from other deformities. 



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

 P- 332- 



The illustration is of specimens gathered at Aylsham, 

 Norfolk, by the author. 



