-132- 
Anopheles crucians Wied* 
Same as for Aedes sollicitans. — Ginsburg ( 178 ) ■ 
Anopheles funestus Giles 
A dosage of only 0.10 cc. per square yard of a Diesel oil solu- 
tion containing 5 percent of pure DDT killed all larvae, and continued 
to kill for 4 days. This dose is extremely small, corresponds to 24 
grams or 0.8 ounce per acre, a figure well below the conventional 2 to 
4 ounces, even allowing for the fact that pure p,p f -DDT was used. 
Even more remarkable, a tenth of this dose (0*01 cc. per square yard, 
or 0.08 ounce per acre) killed all larvae but had no lasting effect.— 
Buxton (100) • 
Anopheles maculipennis Mg« 
Even extremely low doses of DDT, 50 mg* per square meter (10.8 sq* 
ft*), have some effect on mosquitoes although this is very temporary. 
With doses of 200 mg* per square meter or more the treated surface re- 
mains lethal to the maculipennis group for 10 weeks* Higher doses give 
a slightly prolonged effect which is not in direct proportion to the 
amount applied* In practioe a dose of 500 mg* per square meter should 
be aimed at and it should be considered to be effective for 8 weeks*— 
Buxton (100 ) • 
Anopheles quadrimaoulatus Say, the common malaria mosquito 
Up to 200 adults were found resting in 7 by 9 foot wall tents in 
a summer oamp near Marcellus, N. J* Additional adults were continually 
emerging from a large breeding area in a nearby lake. Groups of tents 
were treated with the following; 3, 1, or 0*5 percent of DDT in kero- 
sene, DDT emulsion diluted 1 to 4, DDT emulsion diluted 1 to 9*3, DDT 
dust (talc), N. J. Pyrethrum Larvicide diluted 1 to 10, and kerosene. 
The DDT emulsion contained 66 percent of kerosene, 2 peroent of DDT, and 
0*5 peroent of sodium lauryl sulfate. A single thorough application 
was made with a knapsack sprayer or hand duster* Some tents were spray- 
ed with a small power sprayer* DDT-sprayed tents were almost entire- 
ly free of resting adults for the 3 l/2-week test period, as compared 
with 2 days* protection with N. J* Pyrethrum Larvicide. DDT dust 
showed little effectiveness* Kerosene apparently had some repellent 
effect* — Hansens (201) * 
Two formulas for DDT emulsion concentrates and detailed instruc- 
tions for spraying houses for the control of malaria mosquitoes are 
given. The summer formula contains 35 peroent of DDT in xylene and 
Triton X-100 and the winter formula 20 peroent of DDT* For use these 
concentrates are mixed with water in the ratio of 1:13 and 1:7, re- 
spectively, to give a spray containing 25 mg* of DDT per milliliter. 
