354 [May 



of C. tuber Fitch (compare Proc. etc. I. p. 71, No. 27). Mr. Bassett 

 may be right, and if I have any hesitation in this matter, it is on ac- 

 count of the hard, seed-like bodies, mentioned by Fitch as belonging to 

 the gall Q. tuber, and not mentioned in the description of the gall Q. 

 batatus. These seed-like bodies are not to be found in the erall called 

 Q. tuber by Mr. Bassett (now clavula Bassett). Whether the fly C. 

 batatus Bassett is identical with batatus Fitch is also not quite cer- 

 tain, as Dr. Fitch's short description may just as well apply to a guest- 

 fly ( Ceropt res) usually obtained in abundance from the same gall. 

 Still, as there is nothing in Dr. Fitch's description to contradict the 

 synonymy, there is no harm in adopting it. 



21. C. verrucarum O. S., Proc. etc. I, 62 (9; Q. obtusiloba.) 

 Compare also above, page 340. Xo. 4. At the time when I described 

 this species I was not positive about the sex of my specimens. I per- 

 ceive now that they are really females. 



b. Galls on the group of the red, black and willow-oaks. 



22. C. spongifica 0. S., ( % 9; Q. tinctoria). 23. C. oocoixk.e 

 0. S., Proc. I, p. 243-245 ( 9 ; Q. coccinea.) Mr. Walsh suggests 

 (Proc. etc. II, p. 445) that as V- coccinea is probably nothing but a 

 variety of Q. tinctoria, these two galls, which show but little difference 

 and produce apparently the same insect, may be considered as identical. 

 It may really be so. but the apparent identity of the insect alone would 

 not be a sufficient proof, as it seems that in the group of Cynipidst to 

 which C. spongifica belongs, the species are sometimes very difficult to 

 distinguish. (Compare the two following species.) C.aciculata v) S. 

 (Proc. etc. I, 56) being the dimorphous 9 °f 0. spongifica, all that 

 has been said by me (Proc. etc. I. p. 244—245) about the assumed dif- 

 ference between their galls will have to be cancelled. Still, it would 

 be worth while to investigate whether these galls are absolutely identi- 

 cal, so that no outward sign whatever indicates the contents of the gall. 

 G. confluents Harris, Ins. etc. p. 546,3d edit, is apparently synonymous 

 with C. aciculata, although Harris says that it occurs on the red oak. 



24. C. inanis 0. S., Proc. etc. I, p. 242 ( % 9 ; (J. rubra). Com- 

 pare also Walsh, Proc. etc. II, pp. 457, 458. At the time when I de- 

 scribed this gall, I was uncertain whether it occurred on (J. rubra or 

 7. coccinea. Mr. Walsh found it on (J. rubra in the environs of Rock- 

 Island ; and Dr. Fitch, (Rep. II, Xo. 317) who described this gall as 

 that of Callaspidia confluenta Harris, likewise found it on the red o ; ik. 

 Thus the question may be considered as settled. Mr. Walsh was the 

 tirst to obtain the male sex of this species. I am not aware of any dis- 



