255. 
The host-plant record of the Insect Pest Survey is a useful file 
of which very fev of the workers of the Bureau are cognizant. There 
are listed under each food plant the insects known to attack the plant. 
x ; 
he file now contains 2,100 species of plants, with as many as 200 in~ 
sects recorded from some plants. 
PHYSIOLOGY AND TOXICOLOGY OF INSECTS 
M. C. Swingle and J. F. Cooper, Sanford, Fla., found that two 
species of lepidopterous larvae, the dianoni-back moth (Plutella mocu- 
lipennis Curt.) and 2 corn-feeding cutvorm as yet unidentified, ied, were 
Wery susceptible in the first instar to fixed nicotine eta ed ee 
of the nicotine-bentonite tyne. These insects were much more suscep 
tible than those previously tested, such as the southern arnyworm 
n 
(Prodenia eridania Cran.), the imported cabbage worm (Ascia rapee L.), 
and the green thouse leaf tier (Phiyetae wie, rubigzalis Guen, ) 
D. EB, Fink, Takoma Park, Md., found little or no difference in 
toxicity to aan larvae beth ioe nicotine sulphate ana an extract 
containing all substances extractable from iu ab aD Ope the solutions 
were tested at the same nicotine Schad eee: ion. 
F. L. Campbell and W. N. Sullivan, Takoma Park, built a new appar- 
atus for testing kerosene—base insecticides against house flies. Six 
Glass cylinders are placed on a revolving circular table so that they 
pass uncer a fixed spray gun, This apparatus can be operated rapidly 
by one man. It was found that the susceptibility of flies is not 
altered by chilling them prior to the treatments. 
* m7 TT 
Bee CULTURE 
The Secretary of Agriculture has given tentative approval to the 
mroposed marketing agreement for package bees, nuclei, and queens. 
This was followed by sending to all bee shippers in the United States 
copies of the agreement for signature and retvrn. As soon as two 
oes of all agreements have been signed and returned, it is then 
customary to submit the agreement to the Secretary again for final ap— 
proval. The returns from the shippers, however, have been very dis-— 
appointing and their indifference or timidity in signing the agree- 
ments and returning them is causing a delay in the final approval of 
the agreement, at a time when Ps may” eerie jeopardize the whole 
project. The season for shipping package bees and queens is almost 
at hand and unless the agreenent is given final approval within the 
next few days it is feared that all the work involved in preparing the 
agreement and having it approve may be lost. 
