1865.] 350 



already commented upon this analogy (page 342). The galls seem like- 

 wise to be somewhat alike. 



42. C. quercus palustris 0. S. Proc. etc. I, p. 62, No. 11.. 1. c. 

 I. p. 251 ; Walsh, 1. c. II, p. 488 ; Bassett, 1. c. II, p. 329. This gall, 

 originally found by me on Q. palustris, has been found since on Q. 

 tinctoria. coccinea, falcata, imbricaria and ilirifolia. The insects from 

 all these galls belong apparently to the same species. 



The insects producing the following galls, are as yet unknown and 

 some of them may not belong to the Cynipidze, at all. 



43. Gall on Q. prinos, described by me, Proc. etc. I. p. 254. May 

 it not be the same as the gall of C. hirta Bassett ( Q. montana) ? 



44. Grail on Q. palustris, described by me, Proc. etc. I, 253. The 

 gall described by Mr. Walsh (Proc. etc. II, p. 481) under the name of 

 Q. pilula, (Q. tinctoria'), the gall-fly of which he did not obtain, 

 is not unlike my gall of Q. palustris. Mr. Walsh's gall is the pro- 

 duce of a Oecidomyia; the orange-colored larvae, mentioned by this 

 author (1. c. at the bottom of the page) are larvae of that genus of 

 Diptera ; and the gall itself is the same which has been mentioned by 

 me, (in the Monographs on N. A. Diptera, Vol. I, p. 201, line 10 from 

 the top,) in connection with Cecid. symmetrica 0. S. It is not impro- 

 bable, therefore, as already suggested by me (Proc. etc. I, p. 253), that 

 the gall of Q. palustris there described is likewise the produce of a 

 Oecidomyia. The fact that Mr. Walsh bred an inquilinous gall-fly, 

 Ceroptres (Amblynotus) inermis Walsh, from his gall is very remark- 

 able, and I believe the only instance ou record of a Cynipidous insect 

 living as guest in a dipterous gall. 



45. Cynips q. lana Fitch (Q. alba), being probably not a Cynips, 

 but a guest-fly, perhaps Syncrgus, the gall-fly of the gall which Dr. 

 Fitch describes under the name of Q. lana. is as yet unknown. Mr. 

 Bassett has communicated to me specimens of a gall answering exactly to 

 Dr. Fitch's description and figure. Until the gall-fly of Q. lana Fitch 

 (which gall will have to be called then by the name of that gall-fly) is 

 bred, the question of the identity of this gall with that of C.flocci Walsh, 

 can hardly be settled. Judging by the measurements given by Mr. Walsh 

 ( 0.2 — 0.4), his gall seems to be usually smaller. (Compare Walsh, 

 Proc. etc. II, p. 482.) 



46. Grail on Q. ubtusiloba similar to the preceding, and described by 

 me Proc. etc. I, p. 62. My specimens are of a darker, more brownish- 

 yellow color than the gall Q. lana Fitch, and seem usually to occur 

 near the basis of the leaf, whereas Q. lana is generally found about the 



