Galls caused by the larvce of Gecidomyia rosaria Lw. 



on 



the terminal leaves of Salix aurita Linn. 

 PLATE 85. 



Synonymy of Insect. 



Cecidoviyia rosaria Hardy, Theobald. 

 „ cinerearutn Lw. 



Habitat of the Round-eared Willow.— Common through- 

 out Britain in woods, thickets, moist meadows, and damp 

 places generally. 



The Gall is formed by the feeding of the larva upon the 

 end of the shoot, which prevents its further growth, and 

 causes the leaves to assume a rosette form. 



Position.— At the end of the twig. 



Manner of Growth. — Singly ; rosaceous. 



Colour. — Green, turning brown with age. 



Average Dimensions of a Mature Specimen. 

 Height, 20 mm. ; diameter, 40 mm. 



May be sought during any month in the year. 



The Growth is complete by the end of August. 



The Typical Condition of the gall is unilarval. 



The Larva pupates in the gall. The imago emerges during 

 the spring. 



Plate 85. Illustrates the appearance of the rosettes during 

 the months of June to December, and may be considered as the 

 summer-autumn form. 



Plate 86. Those found during the months of December to 

 June, illustrating the winter-spring form. 



The illustration is of specimens gathered at Hastings by 

 the author. 



