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 flie 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. 



ISlatMral 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 Aeerophagus and the new species 

 coccois. As pointed out by the writer in the Annual Report of the 

 Department of Agriculture for 1880, p. 3G1, this species belongs to 

 Foerster's genus Rhopus, 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 Lecanimn 

 racemosvs Ratz. This insect was the smallest encyrtine known up to 

 the time when Miss Smith bred R. coccois. The European species 

 is 0.(3 """ long, while R. coccois is O.o.j """ in length. It is interesting 

 to note that the only other Rhoi^us which has since been reared was 

 bred by Mr. Coquillett from his Pseudococcus yucccv from California. 



Miss Smith also found a Syrphns larva feeding upon the young- 

 bark lice, while from the pirparium of this larva she reared a chalcidid 

 which she stated to be a species of Eulophns. Three ladybirds {Hyper- 

 ospis signata, Chilocorus hivulnerus, and Anatis 15-pnnctatus) were 

 found feeding n\)on 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 Bacclia 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 larvae received from Mr. 

 Jack, Hyper asp is signata was also found to be feeding. 



Identity oftlie species. — 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 

 Pseudococcus aceris 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 tlie European species as red or reddish-yellow, without dis- 

 tinguishing between male and female. The adult male, by the way, 



