KEY TO AMERICAN INSECT GALI.S 



ELB eutenmuller 



Fig. 89. Philomx galls, i. Oak pea gall, P. pezomachoides O. S. 2-4. Oak hedgehog gall, 

 f- ennacei Beutm. 5. Yellow sea urchin, P. echini Ashm. 6, 7. Spiny oak gall, P. 

 prinoides Beutm. 8, 9. Hairy oak gall, P. villosa Gill. 10. P. hirta Bass. 11. Jewel oak 

 gall, P. macrocarpae Bass. 12, 13. P. n i g e r Gill. (After Beutm., Am. Mus. Nat. Hist.) 



