ISGl.] 



55 



11. Ou limbs, twigs, etc. 



A. Formations of a different substance than the limb, which can be 

 taken off without carrying a portion of the limb with them. 



Globular, corky galls with a single kernel. 



19. White oak; Ci/nips quercus t/hhulits Fitch. 



Post oak; ) ,, ^. , 



^ ' - ^ gall-flies unknown. 



fewamp chestnut oak ; ) 



Oblong, smooth gall, spongy inside; single kernel. 



20. Spanish oak; gall-fly unknown. 



Wooly mass, surrounding the twig and containing very num- 

 erous seed-like kernels. 



21. White oak; Ci/nips seminator Harris. 



Bladder-like, hollow galls, packed together in numbers round 

 the limb. 



22. White oak; Ci/nips quercus fieus Fitch. 



AA. Swellings of the limbs, twigs, leafstalks, which cannot be detach- 

 ed without breaking the limb. 



At the tip of limbs and twigs. 



23. Willow oak; Cynips quercns 2JhelIos 0. S. 



24. White oak ; Cijnips quercux arhos Fitch. 



25. White oak ; gall-fly unknown, perhaps identical with 



the preceding. 



Distant from the tip of limbs or twigs. 



26. White oak; Cynips quercus hatatus Fitch. 



27. White oak; Cynips quercus 'tuber Fitch. (*) 



* The singular woody knots, emitting pale yellow, conical, brittle projections, 

 which occur in great numbers on the pin oak, if they are produced by a Cynips, 

 should be referred to this section. 



