1865.] 351 



4. C. tubicola 0. S., Proc. etc. T, p. (50 ( 9 ; Q. obtusiloba.') Again 

 a Gynips Hartig, as Mr. Reinhard, td whom 1 have communicated spe- 

 cimens, informs me. 



5. C. CLAVULA Bassett in litt. (%n. G.q. tuber Bassett, non Fitch). 

 ( 2 ; Q. alba). This insect, described by Mr. Bassett (Proc. etc. III. 

 p. 685) as C. q. tuber Fitch, could not retain this name, as Mr. Bassett 

 himself proves that itisnot the insect described by Dr. Fitch, the latter 

 being a guest-fly. I have therefore adopted the name C. cluvula, sug- 

 gested to me in a letter by Mr. Bassett himself. Although this insect 

 has a pubescent thorax, like Cynips in the restricted sense of Hartig, 1 

 am not sure whether it is to be referred to this genus. The feet of my 

 specimen are brownish-yellow and not brown, as mentioned in Mr. 

 Bassett's description. According to this author's opinion (1. c.) this 

 gall and that of C. q. arbos Fitch are produced by the same insect. 

 Both C. q. tuber Fitch and 0, q. arbos Fitch are guest-flies; f compare 

 below, the genus Geroptres). 



6. C. SEMINATOR Harris. Inserts etc. p. 54*; Fitch. Rep. 11, No. 

 315 ; 0. Sack.. Proc. etc. 1, 69, No. 21 ; Walsh. Proc. etc. II. p. 465 

 (at the top); ( % $ ; Q. alba ). I had expressed some doubts about the 

 identity of the specimens obtained by me from these galls, with those 

 described by Fitch, as he says that the thorax of the $ is cinnamon-red. 

 Mr. Walsh confirmed my doubts, venturing even the supposition that 

 the gall-fly described by Fitch was a guest-gall-fly. I believe now to 

 have found the solution of the difficulty. Having examined my speci- 

 mens recently, after a lapse of several years. T find that the thorax of 

 all the $ specimens has become reddish, whereas that of the % speci- 

 mens has remained black. It seems probable, therefore, that Dr. Fitch 

 had rather old specimens before him when drawing his description. C. 

 seminator belongs to the genus Andricus Hartig. 



7. C. petiolicola Bassett, Proc. etc. II, p. 325 ( % 9 ; Q. montana) ; 

 compare also Walsh. Proc, etc. II, p. 487; ( Q. prirnts, var. discolor). 

 This is the gall which was described by nie as occurring on Q. prinus 

 ( Proc. etc. I, p. 66); at that time I obtained only parasites from it. 

 Mr. Bassett has found a similar gall on Q. prinoides (1. c. II, p. 325), 

 giving a closely resembling fly. A number of specimens of the latter, 

 which I owe to Mr. Bassett, are smaller, the body of the female is con- 

 stantly pale brown (and not black, as that of C. petiolicola^), and, as 

 Mr. Bassett remarks, the veins of the wings are less distinctly marked. 

 This is again a case of a phytophagic variety, which may almost be con- 

 sidered as a distinct species. A similar gall on Q. alba, mentioned by 

 .Mr. Bassett (1. c.) produces an insect which stands to C. petiolicola in 



