JOURNAL OF ECONOMIC ENTOMOLOGY 
120 
[Vol. 17 
Arlington colony, and one extreme case of a recovery 5 miles distant 
from the nearest liberation point. 
Plans for the immediate future call for a breeding campaign on 
Exeristes roborator Fabr., Microgaster tibialis Nees., and Angitia punctoria 
Roman and also a careful study of parasitism in the field, that is the 
recovery, dispersion, percentages and the many other factors upon which 
we should have data before we can efficiently pick out the various species 
which should have supplementary colonies established to more rapidly 
and more evenly distribute the more favorable species over the New 
England area, the New York area, and the large area bordering Lake 
Erie. 
This program cannot be carried out at once. We can only give each 
species the most perfect chance possible to establish itself and let nature 
take its course. Nature makes the test and we note results. If we see 
good results we can then assist nature by laboratory breeding and save 
many years and thousands of dollars by proper distribution of parasites 
to act as breeding stock in various carefully selected localities. If you 
will pardon me, this problem seems a chance for a new type of entomolo¬ 
gist, the Henry Ford type, where “Increase production and save dollars” 
is the motto to be made possible by “Simple, efficient equipment and 
systematic handling.” 
ENVIRONMENTAL STUDIES ON THE EUROPEAN CORN 
BORER (.PYRAUSTA NUBILALIS HUBN.) 
By K. W. Babcock, European Corn Borer Laboratory , U. S. Bureau of Entomology 
Arlington, Mass. 
Abstract 
Article contains summary of research in connection with the investigation of the 
seasonal history of the European corn borer (. Pyrausta nubilalis Hubn.) in various 
localities, consisting of three main lines; first, possibility of two distinct species 
occupying areas of diverse seasonal history; second, possibility of a geographic race; 
third, the intimate study of the environment. The third section of the investigation 
is particularly reviewed, the writer attempting to emphasize the impracticability of 
predicting seasonal history on the basis of temperature correlations alone. There is 
also a review of the methods of studying seasonal history in relation to various 
types of environment as well as summaries of experiments upon the rest period, indi¬ 
cating the far reaching effect of moisture fluctuation during this period upon further 
development. 
The importance of obtaining detailed information! upon the physiology during the 
critical life periods is emphasized as well as the desirability of making a careful 
European survey of the insect’s seasonal history with a view of obtaining biologically 
