~ 34. 
zation (21 percent of the total) is not unusual, the parasitization 
of specimens collected in a single locality on a single date occasion- 
ally exceeded 60 percent. For example, in 50 specimens labeled as 
follows: Tuttle, Idaho, No. 14, July 8, 1932, S. pestifer, D. BH. Fox, 
33 showed visible parasitization (66 percent). Of 20,specimens label- 
ed as follows: Tuttle, Idaho, No. 14, July 20, 193e,’S. pestifer, 
D. 5. Fox, 13..shoved eiainis parasitization (65 percent). Other lo- 
calities showed similar high percentages of parasitization but with a 
smaller number of specimens. 
INSSCTS PEST SURVEY 
During the month (February) the Survey has completed the Annual 
Summary of the 1933 volume of the Insect Pest Survey Bulletin. The 
index to this volume is being checked and will be published shortly. 
A new application of the information obtained by the Survey has 
been nade within the month. Insurance companies are requesting in- 
formation on the relative abundance of important insect pests in 
different parts of the country in order to inform themselves of the 
hazards they might expect in farm loans 
With the starting of a new volume of the Survey bulletin on 
March 1, we are particularly anxious that the entomologists of the 
several divisions of the Bureau, including the men at the various | 
field stations, shall feel that the Survey is a definite activity of 
the Bureau for which they are as much responsible as are the outside 
collaborators in the experiment stations, colleges, and departments 
of Agriculture in the States. At the present time the Insect Pess 
Survey has 103 outside collaborators located in the 4g Stotes and 
in the Territories of Puerto Rico and Hawaii, with additional re-— 
porters in Brazil, Costa Rica, Egypt, and Mexico, Any observations 
made will be of interést to the Survey, even though they seem triv= 
ial at the time. he Survey has prepared a post-card report form, 
a number of which can easily be carried in a coat pocket. Notes 
con then be made in the field, and the card mailed at the first mail 
box encountered. Those desiring a supply of these post cards should 
request them throvgh the Washington office of their Division. 
PEYSIOLOGY AND TOXICOLOGY OF INSECTS 
J. W. Bulger, Takoma Park, Md., found phenothioxin toxic to cul= 
icine mosquito larvae at. concentrations as low as 1 part to 500,000 
parts of water. This compound is analogous to diphenylene oxide 
and diphenylene sulphide previously found to be very toxic to mos-— 
quito larvae. 
D., E. Fink, Takoma Park, is studying the relative toxicity to 
* . . wi 
mosquito larvae of tobacco extracts and nicotine sulphate of the same 
nicotine concentration. 
ee 
