Galls caused by the larvae, nymphs, and imagines of 

 Eriophyes galii Karp. 



on 



the leaves of Galium Aparine Linn. 



PLATE 51. 

 Synonymy of Mite. 

 Pliytoptiis galii Karp. 

 Cecidophyes galii Nalepa. 

 Eriophyes galii Nalepa. 



H.\1UTAT OF THE GooSE-GRASS. — This common herb is very- 

 abundant in hedges, among brambles, and on banks all 

 over Britain. 



Position of the Gall.— The entire leaf is affected, and 

 forms the gall. 



Manner of Growth.— Gregarious. 



Colour. — Very pale green, ultimately yellowish green. 



Average Dimensions of a Mature Specimen. 

 Length, 30 mm. ; girth, 5 mm. 



May be sought during the months of May to October. 



The Growth is complete by the end of August 



The peculiar contortions assumed by the leaves of this 

 plant when attacked by the Eriophyes enable them to be easily 

 recognised. Although the plant is ubiquitous throughout 

 Britain, the galled condition is not often seen ; it appears to 

 be uncommon and local. If gathered in the early part of May, 

 the imagines may be seen (under magnification) in a lethargic 

 condition, as also large masses of ova. Later in the month, 

 and throughout June, the nymphs are very active and numerous. 

 The specimen in the centre of the illustration is of a normally 

 developed stem and leaves, and is introduced for the purpose 

 of comparison with the others. 



The illustration is of specimens gathered at Guestling by 

 Mr. F. Hall. 



"34 



