370 [May 



(unless it is proved that I was mistaken in the supposed identity of Q. 

 pisum with the gall which gave me the latter species; compare above, 

 p. 352, No. 12). But whether this guest-fiy is identical with Ceroptres 

 pisum 0. S. is rather doubtful, as my specimen measures 0.14. whereas 

 Dr. Fitch's species is said to be 0.08 ( $ ) and 0.11 ( o ) long. 



In order to complete my previous description, I give a new one here: 



9 ■ About 0.14 long; head black, finely pubescent: mandibles and the mouth 

 brownish red; face acicul.Ue, an oblong swelling under the a'ltennse; vertex 

 microscopically punctate; antennae brown'sh-yellow, 13-jointed, nearly as long 

 as the body, almost filiform; fourth joint slightly longer than the third; the 

 following joints very gradually diminish in length; the thirteenth or last 

 joint is twice the length of the preceding: a distinct suture divides it in two 

 parts, in the only specimen in my possession. Thorax black, finely pubescent 

 and densely, but very delicately rugose: parapsidal grooves distinct, moderately 

 deep; between these grooves two very indistinctly marked impressed lines run 

 some distance from the collare backwards; scutellum with a deep, rough, irreg- 

 ular sculpture: polished space on the pleurte smooth. Abdomen dark brown 

 or black, paler brown along its inferior edge; second joint divided into two une- 

 qual parts by a very distinct suture; the first part has, dorsally, a little less 

 than half the length of the second; at the basis of this second segment the ab- 

 domen is distinctly downy; the ventral valve is pale brown, considerably pro- 

 jecting, its tip at an angle of somewhat more than 45°; the sheaths of the ovi- 

 positor do not project at all above the dorsal line. The feet are yellow, except 

 the extreme basis of the coxre, especially of the hind ones, which is black, and 

 the tip of the tarsi, which is infuscated. Veins of the wings pale yellow; areo- 

 let of moderate size, its posterior portion somewhat indistinct. 



Bred a single specimen from the gall called Q. pisum by Dr. Fitch, 

 but which is probably the produce of Andricus (Teras) pezomachoides 

 O. S. This species is larger and more slender than the other species 

 of the genus. It is remarkable for the contrast between the sculpture 

 of the scutellum, which is very deeply rugose, and that of the thorax, 

 which is very delicate and perceptible only under a strong lens. Whe- 

 ther the shortness of the sheath of the ovipositor is really a character of 

 the species, or whether its tip is broken off in the only specimen which I 

 possess, T am unable positively to affirm ; in the first case, this character 

 would distinguish this species from the other known species of the 

 genus. 



5. Ceroptres arbos Fitch. 



Syn. Cynips q. arbos Fitch, Rep. II, No. 310. 



6. Ceroptres tuber Fitch. (?) 



Syn. Cynips q. tuber Fitch, Rep. II, No. 309. 



Mr. Bassett has shown (Proc. etc. Ill, p. 687) that both galls, de- 

 scribed by Dr. Fitch under the above-mentioned names are produced 

 by the same gall-fly, which was uot known to Dr. Fitch, and that this 



