328 [December 
veins brown, distinct but slender, areolet distinct, cubital vein vanishing be¬ 
fore reaching the 1st transverse. Length 0.12. 
. Antennce 15-jointed: dull dark brown, very long. Legs darker than in 
the female. Abdomen elongated, 2nd joint nearly two-thirds the length of the 
entire abdomen. In other respects like the female. Length 0.10. 
Several of the species described by Dr. Harris, Dr. Fitch, and Baron 
Osten Sacken are common here. Among them Ct/nips q. sem.inator 
Harris, always found on Quercus alba, and what I take to be Cijnips q. 
operator Osten Sacken, though the gall is found on two widely diffe¬ 
rent species of oak,—Q. palustris and Q. ilicifolia. Baron Osten Sack- 
en’s specimens were from Q. nigra—an oak nearly related to Q. ilici¬ 
folia. It is very abundant. I think a peck of galls could have been 
gathered from a single tree this season. 
Cynips q. ficus Fitch. 
The galls are often met with, but all the flies I have yet examined 
were parasites. 
Cynips q. cornigera Osten Sacken. 
Rather rare, found on Q. ilicifolia and an undetermined species of 
oak. 
Cynips q. globulus Fitch. 
Often met with on the thrifty shoots of Quercus montana in recently 
felled woodlands and occasionally on twigs of Q. alba. My galls of 
this species were collected in March of the present year. In June 
large numbers of parasitic flies appeared in the boxes. To-day (Oct. 
19) I opened the galls that were not pierced and found flve living and 
fully developed, true gall-flies. Two of them are from galls found on 
the white oak, the others from those found on Quercus montana. but 
I am not able to discover any difference between them. As some of 
my galls are from a species of oak different from those mentioned by 
Dr. Fitch or Baron Osten Sacken as producing them, and as the flies 
produced from them are as large oi- even larger than the specimen de¬ 
scribed by Baron Osten Sacken (Proc. Ent, Soc. Phil, i, p. 68). I add 
a very brief description. My specimens are all females. 
Black: head and thorax and also the second segment of the abdomen, exce])t 
the hind margin, quite densely covered with whitish hairs: antennae l4-jointed. 
black. Abdomen very minutely punctate. Wings large, veins distinct, areolet 
small, radial area not closed. Length from 0.19 to 0.23. 
The parasitic larvae, so often found in these galls, were not.—in the 
