LIST OF SMALL ILLUSTRATIONS. 



The millimetre scale 



Fig. I. A fine specimen of gall caused by Lasiopfera rtibi 



A. As growing. Natural size 



B. Longitudinal section. Natural size 



,, 2. Urophora cardui 



A. The imago, x 5 



B. The larva, x 10 



c. Section of gall showing larval chambers. Natural size 



,, 3. Leaves of Urtica dioka 



A. Three leaves showing under surfaces 



B. Upper surface of a leaf 



c. Lower portion of B, sliovving sections of galls 



,1 4. Hairs from exterior of gall of Cecidomyia veronica: . 

 „ 5. Portion of stalk oi Rantmcjilus repens twisted by Polycystis 

 pompholygodes 



„ 6. Five stages in the spiral formation of a petiole of Populus 

 nigra 



„ 7. Galls on stem and edge of leaflet of Rosa cattitia 



,, 8. Thirteen galls on seven leaflets of Rosa canina 



„ 9. The gall and larva of Rhodites rosw 



A. The cells 



B. A fibre from exterior (enlarged) 



c. The larva, x 22. Ventral and profile views 



,, 10. The gall of Urophora so/s(iiialis 



The gall with hairs, x 2 



The gall denuded of hairs, x 2i 



Section showing larval chambers, x 2i 



The larva. x4. 



The pupa, x 4. 



facing 92 



„ 96 



242 

 256 

 256 

 260 



284 



