44 
[April 
single specimen of one, which is not unlike the preceding, and may be 
the same gall; it consists of a mid-rib of a leaf, on which are four 
rounded galls, somewhat, although not entirely coalescent, each retain¬ 
ing its rounded form; the specimen is about 0.8 long, the diameter of 
each of the galls being 0.15 or 0.2. The surface is finely, irregularly 
netted, yellowish and not whitish-mealy like the other. From this 
gall were obtained two % specimens, which apparently belong to the 
species described below as E. ignota. The latter species was labelled 
in Mr. Norton’s collection as being reared from a “ smooth rose-gall.” 
(See above. No. 5). 
8. Elongated swelling of a tioig^ covered with numerous^ dense 
prickles. I owe to Mr. Glover a specimen of this gall, a section of 
which shows cells, evidently belonging to a cynipideous insect. The 
originator of the gall is unknown to me; but in Mr. Norton’s collection 
several 9 specimens of an insect apparently identical with R. dicldocerus 
were labelled as being reared from a similar gall. 
II. Rhodites Hartig. 
The genus Rhodites.^ in Europe as in N. America, seems to be ex¬ 
clusively confined to the rose. Five European species are known, all 
producing galls on this shrub. Six N orth-American species, which all 
share the same mode of living, are described below; one of these spe¬ 
cies (^R. rosse L.) is common to Europe and N. America. 
Rhodites as a genus, is very easily distinguished by its general ap¬ 
pearance, although it is no more satisfactorily defined than the other 
cynipideous genera. Hartig, for instance, counts 15 and 16 joints on 
the antennm, whereas I never found more than 14 in hoth sexes. The 
last joint shows, it is true, a kind of suture in the middle, but this 
suture is no true division of a joint, as can be easily ascertained by 
comparing it to the other divisions; moreover, it occurs in both sexes 
and may even be indistinctly perceived in some of the other joints. 
The third joint is the longest, generally as long as, or a little longer 
than, the two following taken together. The underside of the last ab¬ 
dominal segment is drawn out here in a long point, which seems to be 
peculiar to the genus ; in Diastrophus for instance, the tip of this seg¬ 
ment is more or less truncated. 
The sexes are frequently distinguished in this genus by the coloring 
of their abdomen and wings; the neuration as well as the sculpture of 
the thorax are generally the same in both sexes. 
