8 
for study to Washington. Later in the year, after the larvee had aban- 
doned their hibernating chambers, Mr. Ehrhorn supplied us with partly 
developed larve in the terminals of the twigs, and still later pupe, 
together with field notes supplementing or confirming our breeding 
records. 
Some of the twigs containing the young hibernating larve were, 
during the winter, fastened to peach trees growing in the entomologi- 
eal nursery attached to the insectary. Most of the larve in these twigs 
had been killed by a predaceous mite, and some few, perhaps, died as a 
consequence of the drying up of the twigs, but a considerable number 
of them wintered safely and ultimately entered the new shoots in the 
early spring and completed their development. With this material we 
were enabled to study their habits out of doors under natural condi- 
tions, following the species carefully through two generations and into 
the commencement of a third, as will be detailed below. By the end 
of August our working stock died out and we were unable to secure 
fresh supplies. The material was taken care of and notes were kept 
for the most part by Mr. Theo. Pergande, to whose skill and care is due 
much of the success of the breeding experiments. 
Mr. Craw’s report of the facts discovered by Mr. Ehrhorn is in the 
form of a brief note, and at the wish of Mr. Ehrhorn the more careful 
investigation of the insect herewith presented was undertaken by this 
Division. After the completion of the MS. of this paper the account 
of this insect by Mr. A. B. Cordley was received (Bul. 45, Oregon 
Exper. Station'), which is chiefly interesting as confirming the belief that 
the twig-borer and the strawberry crown-borer are probably distinct 
insects. 
ORIGIN AND DISTRIBUTION. 
The twig-borer is apparently an Old World species, and probably a 
very ancient enemy of the peach, with little doubt coming with this 
fruit from eastern Asia. It was described in Europe by Zeller in 1839 
and in this country by Clemens, as Anarsia pruinella, in 1860. Clem- 
ens’s species was afterwards shown to be identical with the European 
lineatella. As an important injurious insect in this country, attention 
was first drawn to it about 1872 by both Glover and Saunders, the 
report of the former being the first published. Glover’s report describes 
excessive damage by it as a twig-borer in young peach orchards in 
Maryland, and Saunders’s report, while relating chiefly to marked 
injury by a crown-borer in strawberry beds (now known to be a different 
insect), refers also to injury to the peach twigs in Ontario. Consider- 
able damage from the true twig-borer was reported some years later 
by Prof. J. H. Comstock as oceurring in Virginia and in the District 
of Columbia, in connection with which the peculiar fruit-inhabiting 
'The substance of this paper, with some additions, was republished in the report 
of the proceedings of the ninth annual meeting of the Association of Economic Ento- 
mologists (Bul. No. 9, n.s., U.S. Dept. Agric., Div. Entom.). 
