-15- 
DeBussy et al. (48) in 1936 reported that derris in ^ater 
at 1:1,000 (totenone 1:14,000) killed larvae. 
Pro clad jus culicif ormis (L.) 
P." choreus ' (Meig. ) 
Tanypus puntipennis Meig. 
Tanytarsus eminulus (Walk.) 
See also Fellton (35) under C hironomus tenuicaudatus Mall., 
on page 11. 
Chloropidae 
Chloropisca notata (Zett.) (- cir cum data (Meig.)) 
DeBussy et al. (48) in 1936 reported that dusting with 
derris was ineffective against full-grown flies, but spraying 
with derris powder suspended in water (rotenone 1:3,000) was 
more successful, elthough not entirely satisfactory. 
Nozu ( 221 ) in 1939 reported that spraying with nicotine 
sulfate kills the larvae in the leaves, and derris insecticides 
are also effective. 
Oscinis oryzella Mats. 
Oguro and Kimure (223) in 1932 recommended a proprietary 
derris preparation 'for control, which is very injurious to rice 
in Japan, 
Culicid"?e 
Aedes aegypti (L.) , the yello^*— fever mosquito 
The Zanzibar P u blic Health Department ( 329 ) in 1917 tested 
Tephrosia vogelii as an insecticide. The fresh green leaves 
were pounded in a mortar and made into a pulp. Six half-grown 
larvae were' put in a 1— percent solution of this pulp in water. 
All were dead in 12 hours. 
Aedes excrucians (Walk.) 
Ju fitchii (P. & Y.) 
A. stimulans ( Walk . ) 
A. trich urus Dyar (- A^ cinereoborealis (F. &T.)) 
Gibson ( 108 ) in 1929 reported further on derris for mos- 
quito, control in Canada. Like pyrethrum, derris when used in 
dust form is readily carried away by the wind. The field results 
from the use of this material were even less satisfactory than 
those from pyrethrum. A large semipermanen-t pool in open country 
containing a heavy infestation of mature larvae and some pupae 
of these four snecies was dusted with derris at the rate of 5 
pounds per acre. At the end of 18 hours many larvae appeared 
