344 [May 



former writers, [ have always placed the letter q (guercus) between the 

 generic and the specific names of the Cynipidse of the oak. But as 

 this addition seems to me perfectly useless, I have omitted it now. ex- 

 cept in cases when the name of the species is derived from the name 

 of the oak, (as, for instance, C. que.rcus nigrse ( ). S.) 



1. fn preparing the Synopsis of the galls (Table No. ID, I have 

 mostly retained the subdivisions adopted in my first paper (Proc. etc. 

 [, p. 53). Although these subdivisions are merely empirical, the table 

 will considerably facilitate the task of determining whether a given 

 gall has been described or not, and, in the first case, where the descrip- 

 tion is to be looked for. A scientific subdivision of the eralls has to be 

 based on physiological characters, which are not sufficiently investigated 

 at present. As galls are apt to undergo several modifications of their 

 appearance during the different stages of their growth, the description 

 of a gall should represent it in the state of maturity, which is reached 

 when the gall-fly is ready to escape. This rule should be invariably 

 understood, unless the description is rendered still more complete by 

 representing the successive stages of growth. 



I. Analytical Table of the known species >>/ j\ r . A. Cynips. 



Observation. — The numbers on the left-hand side of the specific 

 names refer to the Remarks, etc. on page 350 and the following. 



1. No distinct pa rapsidal grooves ; mesonotum quite smooth and bare, 



scutellum likewise 2 



Parapsidal grooves distinctly marked (unless indistinct in consequence 

 of a very rough sculpture of the mesonotum) 4 



2. Third antennal joint equal in length to three f 18 - C. irregularis 0. S. J,. 



c r. ., /. ,, . ■ , i ,, (Q. obtusiloba.) 



or four of the following joints taken together ; -j 1Q p . .. _ ' 



, * -11 i ^' niaj ^lis i>assett % 



thorax of the % with yellowisb pleura. p. to, alba.) 



Third antennal joint equal to two of the following joints taken toge- 

 ther, or less 3 



f 20. C. batatus Fitch % 9. 



3. 0.10— 0.12 long j (Q, alba.) 



0.05 long 1 21. C. verrucarum O.S. 9- 



[ (Q. obtusiloba.) 



4. Wings with a conspicuous dark brown cloud at the basis of the ra- 



dial area, on the second cross-vein .5 



Wings without such a cloud, or, at the utmost, with a narrow, in- 

 conspicuous brown margin on the second cross-vein 7 



5. Feet black, except the two anterior pairs of tibiae 1 26. C. q. ilicifoliae Bassett 



and tarsi, which are brownish-yellow. J S 9- (Q- ilicifolia.) 



Feet reddish or yellowish ft 



f 22. C. spongifLca S. £, 

 9- (Q. tinctoria.) 



a . , t j- ,- i *■ n ic i o,,o, 2.3. C. q. coccineae O. S. 9 • 



6. Areoletd.st.net; % 0.1b long; 9 0.23... \ (Q coccinea.) 



24. C. inanis O. S. % 9 . 

 (Q. rubra.) 



