30 British Vegetable Galls 



Unilarval. Normally one larva only living within a catkin, 

 cluster of leaves, or rolled and thickened leaf-margin — 

 e.g. Cecidoinyia betida, C. rosaria, C. taxi, Lipara lucens, 

 C. pteridis, C. ranunculi. 



MULTILARVAL. Normally two or more larvae living within 

 a catkin, cluster of leaves, rolled, thickened, or conduplicated 

 leaf, the flower or fruit, and the stem— ^.^. Cecidoinyia 

 cratcegi, C. lathyri, C. veronicce, C. violce, C. marginemtor- 

 quens, C. persicaricB, C. rosaruin, Lasioptera rubi. 



MULTINYMPHAL. E.g. Pemphigus bursarius, P. spirotheccc, 

 Tetraneura ulmi. 



