680 [December 



The galls of this species are very rare. I have found only two clus- 

 ters, and one of these was much eaten by some Lepidopterous larva, 

 and the larvae of the true gall fly were destroyed. Only a part of the 

 galls in the other cluster were developed as described above; the small- 

 est were not larger than grains of bai-ley, but contained larvae, and have 

 produced true gall flies. Their diminutive size was owing, apparently, 

 to their being closely crowded. 



This and the species next described, G. q. ventricoaa n. sp., are rea- 

 dily distinguished from any other American species yet described, by 

 the female, (male as yet unknown,) having fifteen (fistinct antinnal 

 Joints. Dr. Fitch (N. Y. Rep. Vol. 2. No. 309) speaks of having, in 

 his collection, a female gall fly with fifteen jointed antennae, but he 

 does not describe it, nor the gall from which it came. 



Westwood (Syn. Gren. Br. Insects) does not characterize any genus 

 of the family Cynipidae as having more than the 9 14, and the % 15 

 antennal joints — but the S of my C q. singularis* (Proc. Ent. Soc. 

 Pliila. Vol. 2nd. p. 32(3) has lO-jointed antennae, and 0. q. sritula — a 

 new species described in this paper — also has the same number. The 

 females of both these species have only 13 joints, the terminal one long 

 and connately divided in the middle. 



0. q./ormosa and the species next described are evidently closely 

 related, for besides the 15-jointed antennae of the 9 there are other 

 points of resemblance; and the remarkable diff"erence in the colors of 

 the two species, the ripple-marked thorax of C. q. fonnosa, and the 

 widely diff'erent galls from different species of oak, are the most marked 

 specific characters. The shape of the abdomen of both species is pe- 

 culiar; different in form, and, I think, in structure, from any other spe- 

 cies I am acquainted with, but I have not yet sufficiently studied the 

 structure to describe it well, and have simply, in my description, no- 

 ticed the vertical diameter as equalling or exceeding the length. 



*Mr. "Walsh assures me that my C. q. singularis is the same as C. q. nubili- 

 pennis Harris. He is undoubtedly correct, and my name stands, of course, as 

 a Synonym. Dr. Harris' very brief descriptions were- definite enough, perhaps, 

 when the number of species was, as when he wrote, very small, but hardly com- 

 plete enough for the genus to-day. The number of species described and 

 properly belonging to, or provisionally placed in, the genus Cynips, exceeds fifty, 

 and many more will probably be found. 



