
- 15 - 
other trees. Data have also been secured showing that the attack of these- 
insects extended through the month of August into September." 
According to F. P. Keen, of Portland, Oreg., "The defoliation of 
hemlock in southwestern Washington by the hemlock looper * * *declined 
rapidly during the first half of September, as more and more caterpillars 
entered the pupal stage. * * * Parasites are fairly abundant. Nearly 30 
per cent of the pupae are parasitized by ichneumons and another 20 per 
cent by a tachinid. These parasites have started emerging in the labora- 
tory, but probably overwinter in the pupal stage under normal conditions 
in the field. Whether parasites will stop this epidemic this year is 
Still uncertain. An observation flight was made over the area on the 
19th to check on the extension of the defoliated areas. * * * It was 
evident that considerable extension of the defoliated areas had occurred, 
but the effect of the dusting was also noticeable, particularly where 
areas had been thoroughly covered and dust clouds placed in parallel 
strips." 
Mr. Keen also reports as follows concerning the fall survey of the 
lodgepole forests in Crater Lake National Park to determine the effect of 
the control work against the mountain pine beetle: "The treated areas 
show the reductions which have been secured usually from suchwork. Most 
of the reductions will amount to 75 per cent. Less favorable results 
were secured in two units where the dense stand rendered the sun—curing 
method of control less effective. Probably the burning method will have 
to be used in such areas in the future. Only a few heavily infested 
areas are now present on the outskirts of the controlled areas and for 
the most part the recent epidemic of the mountain pine beetle is now under 
manirol."” . 
"Infested white pine areas of Ranier National Park were examined 
during the month by J. A. Beal, of Portland, Oreg., to check on the re- 
sults of the control work carried on last spring against the mountain 
pine beetle," according to Mr. Keen. "He (Mr. Beal) reports that an 
exceptionally fine cleanup has been secured and only a few newly infested 
trees in areas considerably distant from the controlled areas have been 
found. These will be treated this fall by the Park Service. The good 
results secured on the Rainier areas are due to the thoroughness with which 
the infested trees were disposed of, the isolation of the treated areas 
from any outside sources of reinfestation, and the concentrated grouping of 
the infestation which made it possible to spot all infested trees without 
missing any scattered individual ones." 
Having continued his experiment in cross-—breeding Tachina larvarum 
L. with T. mella Wlk., in connection with his studies of parasites of the 
gipsy moth (Porthetria dispar L.), R. T. Webber, Melrose Highlands, Mass., 
reports: "Additional information* * * indicates that, while fertiliza- 
tion is effected, the progeny are considerably weakened by the crossing. 
With pure stock the percentage of hatching is very high. It is directly 
the reverse in the case of the cross, the larva apparently having great 
difficulty in freeing itself from the egg." 
A report from the gipsy moth laboratory, Melrose Highlands, Mass., 
states: "In connection with importations and liberations of parasites of 
the European pine shoot moth (Ryacicnia buoliana Schiff.) made during 
