STATE AGRICULTURAL SOCIETY. 
811 
OAK. LIMBS. 
I cannot but think that further researches will show that the galls from 
which they conic grow upon different parts of the white oak, if those of 
both flies really he .produced by this one tree ; and that the galls them¬ 
selves will present some differences in their structure. My specimens of 
the"smaller brighter colored fly were found in a jar in which had been 
placed quite a number of galls, and -which had produced an equal number 
of the larger flies, and several parasites, whereby it was impossible to 
ascertain the particular galls from which they respectively came. 
I retain the name of Dr. Harris for the species of which he gives an 
independent description, and which he says comes out in June and July ; 
and present a new name for his dark colored variety, specimens of which I 
have captured on the wing early in May, and again in September, and 
which thus appears to be two-brooded, W’hilst of the other there is probably 
but one generation annually. 
The species which I present as new, is subject to considerable variety 
in its colors. A broad tawny red ring usually surrounds its eyes, and on 
each side of its thorax is one or more spots of the same color. Sometimes 
the scutcl is also red, and the under side and tip of the abdomen is fre¬ 
quently of a resin-like red color, instead of black. Its wing -veins are 
black and the second transverse veinlet is margined with smoky along its 
hind side. This veinlet is angularly bent not only at half the distance 
from its outer end to the small ccutral cell, but also a second time, where 
it forms the hind boundary of this cell, and hereby the cell, instead of its 
usual triangular form, has the shape of a spear head in this species. Its 
size, its aspect, and some other characters are similar to the Oak-apple and 
Cloudy-winged gall-flies, under which latter species, $ 318, its generic 
relationship will be more particularly stated. 
These bullet-like galls are most common and often- 
est noticed of any of the galls on our oaks. When 
growing they are of a pale greenish color, shaded 
into bright red upon the side which is most exposed 
to the light,and with the fading of the leaves in 
autumn, they also fade to the same pale dull yellow 
hue with the dead leaves, even though the insect be 
still inclosed in them, to pass the winter, as it some¬ 
times is. 
I have obtained two parasites from these galls. 
They probably destroy both kinds of these flies indif¬ 
ferently, and also the flies of other galls ; for the 
parasites of these gall insects arc not limited, each 
to a particular species, as we know from frequently 
obtaining the same parasite from the galls of totally different trees and 
shrubs. These parasites pertain to the family CiialcididA5, and resemble 
gall-flies in their general appearance, but are at once distinguished from 
the latter group of insects by the absence of veins in their wiugs. In 
