326 
[December 
Gall on the leaves of Quercus Eubra. 
These galls answer to Dr. Fitch’s description of the gall that is pro¬ 
duced by C. q. nuhilipennis^ so far as this :—They are ‘‘globular, grow¬ 
ing through the leafy expansion of the red oak ] a third of the sphere 
projecting from the upper surface of the leaf; the remainder opposite 
on the under side.” 
My specimens are not, however, as large as a medium sized “ grape 
or hazelnut,” and the gall-fly produced from them differs, materially, 
from that he described. 
They are smooth, thin, varying in diameter from 0.25 to 0.40 of an 
inch; each with an oblong cell in the centre, which is held in place 
by radiating fibres. There is seldom more than one on a leaf, though 
two and even three are occasionally met with. They reached their full 
development with the leaf, and the perfect insect came out about the 
10th of July. The fly may be named 
Cynips q. sing-ularis n. sp. 
9 . Head small, black, rugose: organs of the mouth dark brown, antennae 
18-jointed, short, pale dusky yellow; in some specimens a quite distinct indi¬ 
cation of a 14^^ joint. Thorax black, sparingly pubescent, coarsely punctate or 
pitted; three longitudinal grooves, distinctly, but-not deeply, marked. Wings 
dusky throughout, but not clouded, dark reddish brown veins, all disappearing 
before reaching the margin, areolet rather large, equiangular. Legs, the ante¬ 
rior pairs dusky yellow, posterior dusky brown. Abdomen red (in alcohol a 
dull brick red), the 2nd segment with a few scattered hairs beneath the wings; 
this segment is a little less than half the length of the entire abdomen ; the 
remaining segments microscopically punctate. Length 0.15. 
^ ?—The head, thorax, and wings, in color and markings, do not differ from 
the female save in size, being as usual rather smaller. The antennse are very 
long, (equal the length of the body 0.12,) darker than the female ; in 12 speci¬ 
mens examined (all I have in my colleetion) there were 16 more or less distinctly 
marked joints. After repeated examinations I cannot satisfy myself that the 
16th joint is not what it seems, and not the indication of a joint so often seen in 
the antennae of females of different species. Legs dark brown, posterior pair 
nearly black, all shining. Abdomen black, shining, reddish beneath ; 2nd seg¬ 
ment very long, into which, in most specimens, the terminal segments are par¬ 
tially withdrawn. 
I do not assert that this is the male of the species described above. 
The galls were all from one species of oak and evidently alike; the in¬ 
sects appeared at the same time and no other males were found in the 
box. 
Baron Osten Sacken (Proc. Ent. Soc. Phil, ii, pp. 34 and 35) states 
