52 British Vegetable Galls 



These galls are interesting on account of the large number 

 of larvae to be found in them. Each larva inhabits a separate 

 cell. The cells have very thick and fleshy walls. They are 

 arranged in clusters, or aggregations (as we have designated 

 them), completely embedded within the swelling, which is some- 

 what globular in outline and finely reticulated on the surface. 

 The galls are usually just beneath the surface of the ground, 

 and are not difficult to find. X. potentilUj; also attacks the 

 stems and leaf-stalks of P. reptans. See also plate 129. 



The illustration is of specimens gathered at Battle by the 

 author. 



