810 
ANNUAL REPORT OF NEW YORK 
OAK. LIMBS. 
the further growth of this majestic tree. The galls were at that time per¬ 
forated with pin-holes, showing that the fly had come from them the pre¬ 
ceding autumn. On a careful search, however, two were found with the 
insect still in them. These w'ere placed in a glass jar, and a single male fly 
was obtained from them, which I now discover to be unlike the foregoing 
species. I hence infer this to infest mature and aged trees, whilst all my 
specimens of that were reared from the more accessible galls growing on 
the tender juicy branches of young shoots and saplings. 
311* Oak-potato gall-fly, Cynips QuercuS-batatus, new species. 
A large, hard, uneven swelling, three-fourths of an inch thick and twice 
or thrice as long, resembling a potato in its shape, growing 
on white oak twigs more distant from their ends than the 
Oak-tumor ; producing a small black gall-fly with the basal 
joints of its antennae and its legs dull pale yellow, its 
thighs and hind shanks black and its middle shanks often 
dusky, the antennae in the female with thirteen joints, and 
the length of this sex 0.09. 
This gall might be mistaken for a large example of the 
Elliptic variety of the one first described, but at each end 
the swelling arises much more abruptly from the limb, and 
on all sides of it, whereby the limb is wholly obliterated. 
Its surface is coated with a glaucous pale blue bloom. 
Internally it is of a dense corky texture in which are hard woody spots. 
And the fly which comes from it is readily distinguished from the Oak- 
tumor fly by the black color of its thighs. 
312, 313. Oak-bullet oall-flies. Calluspidia Quercus-globulus, now specie*, and 
Cynips oneratus, Harris. 
Smooth globular galls the size of a bullet, growing singly or two, three 
or more in a cluster, upon white oak twigs, internally of a corky texture, 
each containing in its center a single worm lying in a oval whitish shell 
resembling a little egg 0.15 in length j producing sometimes a black gall¬ 
fly with tawny-red legs and the second veinlet of its wings elbowed or 
augularly bent backwards, its length 0.15; sometimes a smaller fly (C. 
oneratus) of a clean pale yellow color, almost white, with a broad black 
stripe the whole length of its back, which color in the males is more ex¬ 
tended, reaching down upon the sides, its length 0.12. 
Although Dr. Harris regards these two flics as varieties of one species, 
they certainly are very distinct, differing in size, clothing, color and struc¬ 
ture, insomuch that they pertain to two different genera. The first is 
bearded over with fine short gray hairs, whilst the other is smooth. Its 
sting is also evenly bearded with longer coarser hairs, which are wanting 
in the other. The second veinlet of its wings is bent nearly to a right 
angle, whilst in the other it is straight. The antennae have the same num¬ 
ber of joints (15 and 14) in the sexes of both, but in the one fly they are 
black, in the other pale yellow, and with the joints evidently shorter. And 
