1863.] 
43 
wards the mouth; anteniise reddish (somewhat brownish in some of the 9)j 
14-jointed in the %, the third joint very strongly excised on the underside, 
with iDrojections on both sides of the excision which give this joint an almost 
reniform or crescent-shaped appearance; last joint but a little longer than the 
preceding ; 9 antennae 12-jointed, third joint without excision, last joint much 
longer than the preceding, although not quite as long as the two before last 
taken together; thorax black, finely pubescent, finely but densely sculptured, 
and therefore not very shining, although not opaque; parapsidal grooves not 
deep, and distinctly apparent only from a side view; intermediate grooves in¬ 
distinct, shallow, convergent; pleurae with a large, polished space, which ap¬ 
pears aciculated only under a strong magnifying power; scutellum protube¬ 
rant, deeply rugose, opaque, with two small pits at the bottom; abdomen black, 
polished; in the % elliptical, base finely pubescent above, the third segment 
longer than the second; the following ones contracted; the tip finely punc¬ 
tured and pubescent; in the 9 somewhat rhomboidal on a side-view, flattened 
from the sides; the second segment occupies nearly the whole of its surface ; 
the following ones contracted; the last one finely pubescent; sheath of ^he 
ovipositor exserted above the abdomen, pointing upwards; (the structure of 
the 9 abdomen is exactly the same as that of A. sylvestris, n. sp. described on 
page 37); wiugs hyaline, veins pale; second transverse vein somewhat arched; 
margin of the wing inside of the radial area thickened, so as to make it appear 
closed ; areolet of moderate size. 
A large number of % and 9 specimens. 
6. Round galls^ about 0.3 or 0.4 in diameter^ covered loitli prickles 
about as long as the diameter of the gall. Sometimes three or four of 
these galls are in a cluster. This is the gall of Rhodites (Cynips) 
bicolor Harris (1. c. p. 548). G-all and fly were communicated to me 
by Mr. Norton) the fly is described below. Besides other parasites, 
numerous specimens of an Aidax were reared from it by Messrs. Norton 
and Akhurst. This Aidax is hardly different from A.pirata,., described 
above. 
7. Round galls of the size of a pea.^ covered ivith a white effores- 
cence., on the leaves of Rosa Carolina. Sometimes two or three of 
these galls coalesce, thus forming an elongated mass of more irregular 
shape. The leaf is often almost wholly obliterated, the galls growing 
near the central rib. The substance (at least that of the dry galls 
which I have for examination), is hard and woody. Each gall contains 
several cells. They were communicated to me by Dr. Foreman, who 
found them in Maryland, but, except a Ccdlimome^ I obtained nothing 
from them. 
Among the galls communicated to me by Mr. Norton, there is a 
