58 [October 



])ith of a reed in texture. Single kernel in the centre. 



I am indebted for these pretty galls to Dr. Foreman, who brought them 

 from Georgia, and although I do not know the fly, I have no doubt, from 

 the structure of the gall, that it is the produce of a Cynips. 



:->. QuKRCUS RUBRA. Red Oak. Large., amootJi, glohular hroictiisli-yeJ- 

 lotr ijidl., attached to the underside of the leaves, Inside with whitish., deli- 

 rate filaments 1'adiating from the kernel to the shell. Diam. about an inch. 



Very like gall No. 1, at first glance, but smaller, the specimens in my 

 possession measuring an inch or a little more in diameter. It is also fas- 

 tened to the leaf by a small point of its surface. The outside of this gall 

 shows no other difference from the oak-apple of the red oak but the size. 



The inside on the contrary distinguishes them at once; instead of the 

 spongy, brown mass with which the other gall is filled, this one is almost 

 empty, the kernel being kept in its central position by a certain number 

 of whitish filaments which radiate from it to the shell. I have found 

 several specimens of this gall near Washington, without obtaining the 

 insect. 



My attention has been called by Mr. B. D. Walsh, to the fact that this 

 gall has been erroneously taken by Dr. Fitch (Reports, Vol. II, No. 317) for 

 ronfiuens Harris. Judging from some expressions in Dr. Fitch's description, 

 it may really be so. In this case, the insect described by Dr. Fitch as 

 ( '. ronfiuens would be a new species, very like the former; for which I 

 propose the name of C^nijjs quercus inanis (Syn. C. ronfiuens Fitch, non 

 Harris). In the same case, I would be much inclined to think that my 

 C. quercus coelebs is the male, not of C. ronfiuens Harris, but of C. quercus 

 inanis. 



4. Quercus OBTUSILOBA. Post Oak. Smooth^ (jhhular g<dl, attached 

 to tile underside of the leaves., inside with dense., white, silky filaments radi- 

 ating from the kernel to the shell. Diameter three-quarters of an inch 

 in- less. Cynips quercus centricola 0. S. 



Easily distinguished from the two preceding by its smaller size, and 

 its more even surface. The inside is very like that of the preceding gall, 

 only the white filaments are much more numerous and dense and have a 

 silky gloss. In autumn I found these galls brownish-yellow, with num- 

 ennis pale, or brown or reddish spots; in winter the dry galls are of a uni- 

 form color, not unlike that of yellow peas. 



Cynips quercus centricola n. sp. 9 — Head black, opaque, finely pubescent with- 

 out any visible punctation; palpi pale brown, black at tip; antennje 14-jointed; 

 first joint of the flagellum longer than the two basal joints taken together; the fol- 

 lowing joints gradually decreasing in size; the six last joints very short; thorax 



