256 ^ [September 



evidently parasitical larvae. In two or three, however, I tbund a single 

 Cynipideous larva. I did not succeed in rearing it, but obtained several 

 kinds of parasites. 



QuERCUS COCCINEA. Scarlet Oak. Eomid, somewhat oblong, hollow, 

 pale grcemsh-ycllow gall on the under side of the leaf, sligjitlj/ projecting 

 on the ojyposite side; internally, an oblong kernel, kept in its p>osition by 

 filaments, radiating towards the shell. Diameter of the gall about 0.25. 



This gall occurs frequently along the margins of the leaf, although some- 

 times in the middle, near the principal ribs. The shell is rather thin ; the 

 kernel 0.1-0.15 long, oblong in shape. Having found this gall in June, 

 I obtained only a parasite. 



Unknown Oak. Round gall of a hard, corky substance, growing on 

 the branches, its tip drawn oxit in a point; a hollow kernel in the centre. 

 diameter of the full-grown specimens 0.4—0.5. 



These galls were communicated to me by Dr. Morris, in Baltimore, Md. 

 The branches to which they are attached, belong apparently to an oak 

 (they have no leaves). The galls are not unlike those of C. q. globnlns 

 Fitch in size and structure; only instead of being altogether globular, their 

 tip is extended into a point; their color is more reddish. They are at- 

 tached in the same way to the young branches, only they seem to occur in 

 much larger numbers crowded together. Whereas, the galls of C. q. glob- 

 nlns, observed by me occur either singly, or in clusters of two or three, 

 symmetrically arranged round the limb; one of the branches given to me 

 by Dr. Morris, which is G inches long, bears 19 of the galls of the other 

 kind, crowded together in irregular clusters of full-grown and abortive 

 specimens. Another branch 3 inches long bears 9 specimens. 



From this gall I have reared a parasitical Cynips and another punf^iti- 

 cal hymeuopteron. 



QuERCUS NIGRA. Black-jack Oak. Round mass, resembling wool, on 

 the twigs, v:itli numerous seed-like grains inside. Cynips QUERCUS OPE- 

 RATOR 0. S. 



This gall resembles very much the beautiful gall produced on the white 

 oak by C seminator Harris (1. c. p. 69, No. 21). When fresh and grow- 

 ing, it also consists of whitish filaments, forming a white, round body with 

 beautiful pink spots. The inside also contains seed-like kernels. I found 

 the gall in June, on young, flowering branches and obtained on the 23rd 

 of that month the gall-fly which I call : — 



