239 
a lining in the crevices of the waxy secretion, and remain there the 
greater part of the time from October until May. They also convert 
the empty cocoons of Chrysopa into places of resort and concealment. 
The second brood is hatched in June and the third in August, audit 
is from mature females of the third brood that the young issue which 
winter over. It is worthy of note that the young of each generation 
possess the habit of migrating to the trunk of the tree. In the early 
generations, however, this is only for a short period, while the young 
of the last generation, as just stated, pass the winter on the trunk. A 
short time before the males enter the pupa state both sexes wander 
up and down the trunk and larger branches for a few days: the males 
make their cocoons, and the females repair to the leaves, where they 
become stationary. 
Natural enemies. — Miss Smith found that the female is frequently 
parasitised about the time of oviposition by a minute chalcidid, for 
which she erected the new genus Acerophagus and the new species 
eoecois. As pointed out by the writer in the Annual Report of the 
Department of Agriculture for 1880, p. 361, this species belongs to 
Foerster's genus Ehopus, and the species is redescribed and refigured 
at that place and upon Plate xxiv. at Figure 2, The only European 
species of this genus Ehopus (R. testaceus) is a parasite of Leeanium 
racemosus Batz. This insect was the smallest encyrtine known up to 
the time when Miss Smith bred R. eoecois. The European species 
is 0.6 mm long, while R. eoecois is 0.5.j ni,M in length. It is interesting 
to note that the only other Ehopus which has since been reared was 
bred by Mr. Coquillett from his Pseudococcus yucccv from California. 
Miss Smith also found a Syrphus larva feeding upon the young 
bark-lice, while from the puparium of this larva she reared a chalcidid 
which she stated to be a species of Eulophus. Three ladybirds (Hyper- 
aspis signata, Chilocorus bivulneruSj and Anatis 15-pundatus) were 
found feeding upon the bark-lice, and a species of Chrysopa was 
engaged in the same work. 
Among the specimens sent us by Mr. Jack a syrphid larva was also 
found, from which the adult was reared. It proved to be Baceha fasci- 
pennis Wied., and from the puparium of the Baccha was reared a 
species of Pachyneuron, which may be the insect referred to by Miss 
Smith as a species of Eulophus. On the larva received from Mr. 
Jack, Hyperaspis signata was also found to be feeding. 
Identity of the speeies. — While there seems little doubt that the insect 
which we have received the present season is identical with that 
described by Miss Smith, there still remains some doubt that it is the 
Pseudoeoeeus aeeris of Geoffroy, unless Signoret's description of the 
latter should prove to be inaccurate in certain points. Thus, with our 
American form, all the stages of the male are red, while the female larva 
and all stages of the female remain yellow through life. Signoret 
described the European species as red or reddish yellow, without dis- 
tinguishing between male and female. The adult male, by the way, 
