Galls caused by the larvae of Cecidomyia saliciperda Duf. 



on 



the twigs of Salix Caprea Linn. 



PLATE 27. 



The illustration on the opposite page gives the appearance 

 of the galls without foliage as seen during the months of 

 December to June, and may be considered as the winter-spring 

 form of these gall-growths. 



Dimensions of the Specimens. 



Vertical axis. Horizontal axis. Greatest girth. 



Fig. A. . .48 mm. 25 mm. 74 mm. 



Fig. B. . .65 mm. 22 mm. 71 mm. 



Fig. C. . .72 mm. 21 mm. 63 mm. 



These may be regarded as very fine examples. 



The illustration is of specimens gathered at Hastings by 

 the author's sons. 



