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INSECT PEST SURVEY 
In Maréh the first number of Volume 14 of the Insect Pett: Sur~— 
vey Bulletin was issued. Also during this period 960 notes were 
added to the permanent records of the Survey. 
The distribution maps published in the annual summaries are 
attracting much favorable comment. The demand for them, even among 
nonentemological agencies indirectly popae ates with See Sees was 
pronounced, 
Early in the month the Bureau's Extension En LOMeLeta ty Mir. 
Jones, left on his spring extension trip into the Southern States, 
His itinerary provides that he will travel down the Atlantic Sea~ 
board, then across the Gulf States to Texas and northward through 
Oklahoma, Arkansas, and Kentucky. On this trip Mr. Jones will assist 
the State extension workers in organizing to carry on the work 
started by P. D. Sanders in that region last year. He will also 
start some new projects. 
PHYSIOLOGY AND TOXICOLOGY OF INSECTS 
M. C. Swingle and J. F. Cooper, Sanford, Fla,, find that the 
unique toxicity of nicotine silicotungstate for the. southern armyworm 
(Prodenia eridania Cram.) may be due partly to the silicotungstate 
radical, because isoquinoline silicotungstate and silicotungstic dcid 
were absd toxic to first-instar larvae of this species. . 
J. W. Bulger, Takoma Park, Md., finds phenothiazine more toxic 
than rotenone to culicine mosquito larvae. This synthetic compound, 
at a dilution of 1 part.per million, kills over 50 percent of the 
larvae in 8 hours and is the most toxic. compound for mosquito larvae 
so far tested at this laboratory. 
D. HE. Fink, Takoma Park, finds optically active isorotenone and 
B-dihydrorotenone more toxic to culicine mosquito larvae than the 
corresponding inactive forms. 
F, L. Campbell and W. N. Sullivan, Takoma Park, have studied 
the rate of settling of kerosene mist in the cylinders of their new 
testing apparatus, and find that one third of the quantity deposited 
at the bottom of the cylinder in 10 minutes is laid down in the-first 
15 seconds and that the quantity deposited in 5 minutes is only 
slightly less than that laid down in 10 minutes, although the mist 
remains visible in the cylinder for at least 530 minutes. Within cer- 
tain limits of volume, the quantity of kerosene deposited by settling 
in a given time is independent of the quantity sprayed into the cy- 
linder, Evaporation error in weighing glass plates covered by a film 
