Galls caused by the larvse, nymphs, and imagines of 

 Eriophyes macrorhyncus Nal. 



on 



the leaves of Acer campestre Linn. 



PLATE 57. 

 Synonymy of Mite. 



Ceplialoneon myriadeum Bremi. 



Phyloptus macrorhyncus Nal. 

 „ viyriadeuni Murr. 



Phyllocoptcs aceris Nal. 

 Habitat of the Common Maple.— Abundant in southern 



England, but less plentiful in the north and in Scotland. 



It is found in woods and hedges, the latter situation being 



the favourite. 

 Position of the Galls.— On the upper surface of the leaf. 

 Manner of Growth. — Gregarious ; glabrous ; semi-globular 



pimples. 

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

 Average Dimensions of a Mature Specimen. 



Height, I mm. ; girth, 3 mm. 

 May be sought during the months of June to November. 

 The Growth is complete by the end of August. 



It is remarkable how many of these galls are sometimes 

 crowded on the leaves. From 400 to 500 is quite a usual 

 number. In 1899 the author discovered a small maple-bush in 

 a hedge in Norfolk, and upon many leaves of average size he 

 counted from 600 to 8 50 galls ; one rather large leaf contained 

 nearly 1,400. Their number does not very greatly affect the 

 contour of the leaf. When they are purple in colour a very 

 pretty and attractive object is produced. Examination of the 

 under surface with a lens will show numbers of minute de- 

 pressions, which are the openings of the galls. 



The gall is also figured by Nalepa, " Neue Gallmilben," 

 Taf. XV. 



The illustration is of specimens gathered at Hastings by 

 the author. 



