LIST OF ILLUSTRATIONS. 
Page. 
Leaf Galls of Pontania Frontispiece* 
Fig. 1. Head of Peteronu* extenticornu 11 
i'. Mouth-parts of Packynemattu ericksonii 12 
3. Thorax of Pacht/nematus eridksonii 1 :'- 
1 . Types of claws 1 ."> 
5. Abdomen of PaekynemaUu erioktonii 10 
»!. Venation of Ncma tines II! 
7. Pontania pisum Walsh 33 
8. Pteronus ventralis Say , 51 
!>. PachynematiU extensicornis Norton 97 
10. Gymnonyohus calif amicus n. sp 123 
6 
