REPORT OF THE DIRECTOR 1923 33 
and entomologists of the United States Bureau of Entomology and 
of the state of Ohio. 
In general, there has been a more or less limited extension of the 
infested area in New England, a slight extension in eastern New 
York and a fairly substantial extension, particularly to the southward, 
in western New York and Pennsylvania. There has been a somewhat 
considerable extension of infested territory along the lake shore in 
Ohio and also in Canada. It is worthy of note that a slight infesta- 
tion was found this past season in Madison county, N. Y., and 
another in Brooklyn, the latter in an area situated between Prospect 
park and Fort Hamilton. Fortunately, the infestation has increased 
but little, if any, in severity during the past season over the whole 
territory now known to be infested but the continued spread of 
the pest, even in the face of active measures to prevent such an 
occurrence, points to the necessity of a widespread campaign for 
the adoption of measures which would tend to reduce to a minimum 
the abundance of the corn borer. 
Gipsy moth (Porthetria dispar Linn.). During the past 
year the investigational and repressive work on this pest has been 
adequately provided for and handled by the Conservation Commis- 
sion. Several slight infestations, which have been found as a result 
of careful widespread scouting along the eastern boundary of New 
York State, have been apparently entirely wiped out. Extension of 
the known western boundary of infestation in New England makes 
this pest a continually growing menace to the forest and woodland 
areas of New York State, and studies have been carried on by the 
Conservation Commission with a view to laying down, as soon as is 
practicable, the so-called “barrier zone’ along the eastern bound- 
ary of the State, running from the Canadian line to Long Island 
sound, east of which there will be an attempt to keep the insect 
from spreading. Doctor Felt’s observations along this whole line 
have thrown much light on the possibilities of preventing the east- 
ward spread of the pest and should materially assist in directing 
repressive operations in the future to those points at which the 
chances are greatest of the gipsy moth gaining a foothold in the 
State. 
The apple and thorn skeletonizer (Hemerophila pari- 
ana Clerck). The past year has seen a remarkable extension in 
the range of this European pest, and it now occurs from Orient 
Point on Long Island to Whitehall and as far west as Schoharie. 
It has also been found on the west slope of the Catskills in Greene 
