-26- 
The seme Division (293) , in May. 1938, reported results of tests 
with dcrris and cube on fourth insters es follows: 
Material Dosage per sq. cm. Mortality in 18 
hours 
Percent 
98 
100 
100 
100 
27 
91 
28 
100 

67 
39 
100 
Cube (rotenone 4.4 20 95 
percent; total extractives 100 98 
20.7 percent) 20 100 
100 100 
Micrograms 
Derris (rotenone 
20 
5.4 -percent; total 
100 
extractives 15.5 
20 
percent 
100 
Derris-talc (rotenone 
20 
1 percent) 
100 
20 
100 
Derris-talc (rotenone 
20 
0.5 percent) 
100 
20 
100 
H. A. Jones ( 153 ) in 1939 reported the presence of alkaloids in 
cube root (0.08 and 0.40 -oercent in t^o specimens), timbo root (0.15 
percent), end derris root (0.02 percent). The alkaloidel material 
was nontoxic to mosouito larvae at a concentration of 1:10,000. 
An anonymous writer (8) in 1941 reported that the name "Indalone" 
had been registered as the trade mark of the solvent alpha, alpha- 
dimethyl-alpha'-carbobutoxy-gamna-dihydropyrone, -hich was developed 
for use in liquid contact insecticides as a solvent for derris-root 
extractives. ¥ /hen used in this way, it has the property of increasing 
the insecticidal effectiveness of the ingredients dissolved in it and 
of holding derris extractives in solution in the commonly used base 
oils. Indalone is a powerful insectifuge and repels the common winged 
insects, to which it appears to have an obnoxious taste. Because of 
this high repellency, it is especially suitable for cattle sprays and 
mosquito lotions. 
Drosophilidae 
Drosophila «\mpelophila (Loew.), a pomace fly 
Patterson (227) in 1 935 published the indices of toxicity of a 
