gl2 General Notes. [ November, 
wards, and expressed the belief that it did not hibernate at all in 
the Northern States but migrated to the South in autumn, and 
dispersed northward the ensuing spring and summer, and sug- 
gested that this fact, not appreciated by Mr. Scudder, would 
throw light on the history of the species in New England. 
Mr. Lintner'’s paper on a somewhat similar subject, viz., the life 
duration in Heterocera, gave a long series of careful notes of 
collectings, from which he concluded that the average duration of 
moths is from two to three weeks in summer. The paper gave 
rise to some extended remarks from Messrs. Thomas, Mann, 
Riley and others. Mr. Thomas thought that the knowledge of 
the term of life in the imago was of less value, from an economic 
standpoint, than that of the individual in all its states. In en- 
deavoring to ascertain this duration in Leucania unipuncta, he had 
come to the conclusion that it was about seventy-seven days. 
days. In fact, all our experience as to the summer duration 
of life in this species shows that each state of egg, larva, 
chrysalis and imago will average ten days. Mr. Thomas ar 
gued that insects in confinement develop more rapidly than 
in freedom. Mr. Riley gave his experience as opposed to 
the statement: insects reared in confinement during the sum 
mer are likely to develop more slowly than in freedom, for 
the obvious reason that those in freedom get more sunlight, and 
constantly have a supply of fresh food at hand, and this will hold 
equally true with the changes that take place underground, or 
the mean temperature of the soil, during summer, is evidently 
greater outdoors than indoors. Experience shows, moreover, 
that in this question everything depends on the time of yea, 
character of the weather and other surrounding conditions, there 
being a wide range in the duration of life in the same specie>— 
(Lo be continued.) 
Tue New Importep Crover Enemy.—In the September num- 
ber we gave a brief record of the appearance in injurious nine 
of Phytonomus punctatus Fabr., a common European Curculion 
hitherto unknown in this country. In looking up the literatur’ 
_ on the habits of the insects of this genus in Europe, we find mue 
written on the history of the earlier states of several species. 
From what is known in Europe, it appears that the species ~ 
the genus show a unity of habit and mode of development. 
_ greenish larve (recalling in general appearance those of 
or of some Tenthredinid larvae), feed in May and June OB 7 
_ leaves and flowers of the plants they infest, and spin 10 July 35 
_ nét-like cocoon on various parts of the plant, changing 
