220 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 16 
and Southern Michigan. Of course, Epilachna corrupta may not be 
able to withstand the winter conditions that Epilachna borealis tolerates, 
but there is no better criterion in such cases than that here suggested. 
A second function of the Survey is its service; this, though but in¬ 
cidental to its main object, is of considerable value. The Survey 
attempts to discover and rapidly disseminate information relative to 
recently introduced pests; unusual epidemics of native or well estab¬ 
lished pests; and migration and first appearance of destructive migratory 
insects, indicating the rate and direction of migration; also to collect 
statistics and complete data regarding losses occasioned by insect pests. 
The reporting of newly introduced pests should be carried on in close 
co-operation with the Federal Horticultural Board, State Plant Boards, 
Nursery Inspection Services, and other regulatory organizations through¬ 
out the country. 
A Survey should not investigate life histories of insects, devise means 
of control of pests, or undertake extension or eradication work. 
The Insect Pest Survey is a co-operative organization in the broadest 
sense of the word. It obtains its data through collaborators in the 
several States, Fifty-nine collaborators are now functioning. These 
are largely Entomologists of the Agricultrual Experiment Stations, 
State Entomologists, and Entomologists in the State Universities and 
Agricultural Colleges. 
The organization of the Survey may be divided into two branches: 
One, the Headquarters Office, known as the Office of the Insect Pest 
Survey of the Bureau of Entomology, United States Department of 
Agriculture, Washington, D. C., and the other, the Collaborators’ 
Offices located in the several States. 
The Headquarters Office functions in receiving all notes from the 
collaborators, maintaining files of these notes in such a form as to be 
always immediately available, reviewing literature, mapping distri¬ 
bution, and summarizing these reports immediately for monthly, and 
later in a more critical manner, for the annual publications. It corre¬ 
lates the insect data received with the climatological, topographical, 
and ecological data to which it has access, and, Lnally, draws con¬ 
clusions based upon these investigations. It should, eventually, have a 
corps of trained surveyors who could be sent out on special surveys 
augmenting the survey forces in the several States and teaching survey 
assistants at the stations approved methods in order to make the re¬ 
sults more easily comparable. 
The collaborators’ offices function in directing the field surveys in 
