1863.] 
39 
The consequence of this last dilference is that the radial area of 
Aulax is broader, resembling in this respect those of the other Inqui- 
linae, whereas the narrower, although short, area of Diastrophus^ with 
the areolet nearer its basis, is more like those of the true Cynipidae 
(^Psenides). Other dilferences between the two species are, that A. 
sylvestris has the areolet slightly larger,, that its feet are somewhat 
paler, etc. 
Rubus sp. Blackberry. A number of smallround., hollow bodies., 
forming a cluster round a branch. Diastrophus cuscuTuEFORMTS 
n. sp. 
I possess two specimens of this gall, collected near Bladensburgh, 
Md., and kindly communicated to me by Mr. Hitz. 
The globular, seedlike bodies, each having about 0.1 in diameter 
and producing a single insect, are (in one of my galls) from 60 to 70 
in number, and occupy a space of about an inch and a half on the 
branch. They are pressed closely together and offer some resemblance 
to the seeds of Cuscuta^ when found in winter attached to a stem. 
Many of the round bodies emit more or less strong spines, which impair 
in a measure the regularity of their form. The consistency of their 
shell is woody; their color brownish, like that of the branch. 
I was unable to ascertain on what species of Rubus this gall occurs. 
Besides the Diastrophus., originating this gall, I have obtained from 
it an Ormyrus and an Aulax., which, as far as I can judge frum a single 
specimen, is my A. sylvestris., also reared from the other blackberry- 
gall. 
Diastrophus cuscutaeformis n, sp. Pitch brown or black; antennse and feet 
red; areolet wanting; wings hyaline, a small brown cloud near the anterior 
margin, on the angle formed by the second transverse vein and the tip of the 
subcostal; % 15 (?), 9 14 jointed antennas. 
This species is like D. nebidosus in sculpture and coloring, with the 
following differences: 1. The 9 antennae are 14 (and not 13-jointed); 
the last joint is shorter than the two preceding taken together, sub- 
conical, pointed; the 9 antennae (at least in the only specimen of that 
sex which is in my possession) have the 14th joint elongated and sub¬ 
divided by a somewhat indistinct suture in two unequal halves, the 
posterior one being the shortest and thus forming a minute 15th joint. 
