PLATE 3. 



Fig. 9. Mayetiola rigirtae, willow. 



— 10. Cryptocampus cooperae, willow. Section. 



— 11. Cryptocampus cooperae, willow. 



— 12. Euura ovum, willow. 



- — 13. Cecidomyia caryaecola, hickory. 



(70) 



r 



