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INSECTS INJURIOUS TO THE OAK. 39 
antennex of a bright pale yellow color, and one more joint in the latter organs than 
in the preceding species in the males, which sex is 0.06 in length, and to the tips of 
its wings 0.10. (Fitch.) 
31. THE OAK-POTATO GALL-FLY. 
Cynips quercus-batatus Fitch. 
Order HYMENOPTERA ; family CYNIPIDA. 
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 antenne and its legs dull pale yellow, its thighs and hind shanks black, 
and its middle shanks often dusky, the antenne in the female with thirteen joints, 
and the length of this sex 0.09. (Fitch.) 
32, THE OAK-BULLET GALL-FLIES. 
Callaspidia quercus-globulus Fitch, and Cynips oneratus Harris. 
Order HYMENOPTERA ; family CYNIPID&. 
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 an oval whitish shell resembling a little egg 0.15 in 
length ; producing sometimes a black gall-fly with tawny-red legs and the second 
veinlet of its wings elbowed or angularly bent backwards, its length 0.15; sometimes 
a smaller fly (C. oneratus) of a clear pale yellow color, almost white, with a broad 
black stripe the whole length of its back, which color in the males is more extended, 
reaching down upon the sides, its length 0.12. (Fitch.) 
These species are parasitized by two chalcid flies, Macroglenes querci- 
globuli Fitch, and Pteromalus onerati Fitch. 
33. THE OAK-FIG GALL-FLY. 
Cynips quercus-ficus Fitch. 
Order HYMENOPTERA ; family CYNIPIDA. 
Surrounding the twigs of white oaks in a dense cluster, resembling preserved figs 
packed in boxes, each molded to the shape of those pressing against its sides, hollow 
bladder-like galls of the pale dull yellow color of a faded oak leaf, each gall produc- 
ing a small black fly with the lower half of its head, its antenne and legs pale dull 
yellow, its hind shanks dusky and its abdomen beneath reddish-brown, its antenne 
with fifteen and in the female thirteen joints. Length 0.06, females 0.10, and to the 
end of their wings 0.14. (Fitch.) 
34. THE WOOL-SOWER GALL-FLY. 
Cynips seminator Harris. 
Order HYMENOPTERA; family CYNIPIDZ. 
A round mass resembling wool, from the size of a walnut to that of a goose egg, 
growing on the side of or surrounding white-oak twigs in June, of a pure white color, 
or tinged or speckled with rose-red, and in autumn the color of sponge; producing 
small shining black gall-flies with bright tawny yellow legs and antenne, and in the 
female the head and thorax cinnamon-red; their antenne of fifteen and fourteen 
joints; length 0.08, and females 0.11 inch. (Fitch.) 
