76 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 17 
while a similar collection made nearby may show a very few parasitized 
larvas. 
The results which are being derived from the introductions of insect 
enemies of the Gipsy Moth and the Brown-Tail Moth are excellent, 
but thus far they have not been great enough to prevent the increase of 
these species and it appears that more species of foreign parasites are 
necessary to bring about the desired results. The benefits are not 
confined to these two pests alone, for several of the introduced species are 
attacking many native insects and they were also found attacking 
vigorously a recently introduced European pest, the Satin Moth, 
Stilpnotia salicis L. 
In Europe the gipsy moth and the brown-tail moth have their periods 
of great abundance followed by periods of inconspicuousness. At 
present in several places in central Europe there are small areas where 
there are light to medium gipsy moth infestations and the indications are 
that dispar is again on the increase in parts of Europe. 
The exact causes for the periodical outbreaks followed by almost a 
complete disappearance of these insects in Europe are not well under¬ 
stood. There are many factors involved, and the whole situation 
should be thoroughly studied in Europe in an endeavor to determine 
what the various factors are so that as many as possible of the bene¬ 
ficial insects can be introduced into the fauna of the infested area in 
America. 
President A. G. Ruggles: The next paper will be presented by Mr. 
C. P. Clausen. 
A PRELIMINARY REPORT ON THE FOREIGN PARASITES OF 
POPILLIA JAPONIC A 
By Curtis P. Clausen and J. L. King, Specialists U. S. Department of Agriculture , 
Bureau of Entomology , Yokohama , Japan 
Abstract 
A general report on the progress of investigations for the parasites of the green 
Japanese beetle ( Popillia japonica ) in Japan and Korea. The parasites found com¬ 
prise three Tachinids upon adult beetles, two Dexiids and five Scoliids upon grubs, 
and one predator, Shipments totalling 326,000 individuals, in various stages, have 
been forv/arded to the Bureau laboratory at Riverton, New Jersey, for colonization 
The foreign work in connection with the search for the natural 
enemies of the green Japanese beetle (.Popillia japonica) in Japan was 
instituted in the early Spring of 1920 with the assignment of the senior 
