- 95 - 
iommon name Scientific name 
Tobacco flea beetle ' Ep itrix cucumeria Harr . 
* Tobacco thrips Frank! ini el la fusca Hinds 
Tomato fruitworm Eeliothie obsoleta F. 
♦Tomato pinworm Gn or imp schema l ycopersicella Busck 
Tussock moth larvae Hemerocampa leucostigm a Smith & Abbott 
♦Western striped cucumber beetle Diabrot ica trivittata Mann. 
Willow leaf beetles Lina spp. = Chrysomela spp. 
♦Zebra caterpillar Mame6tra picta Harr. 
PATENTS 
These abstracts of patents are arranged in order of their dates of 
issuance under each country; the countries are listed alphabetically. 
The Standard Oil Development Co. (394), a.ssignee of Sankowsky and 
Fulton, in British patent 394,977, issued July 4, 1933, applied for January 
4, 1932, in the United States January 5, 1931, claim an improved insecticide 
comprising hydrocarbons rich in unsaturated hydrocarbons and obtained by 
the extraction of a petroleum naphtha with a solvent having a preferential 
solvent action for said unsaturated hydrocarbons in admixture with an 
insecticidal plant extract. The insecticidal plant extract may be from 
pyrethrum, cube, derris or the like. 
The Booth Steamship Co., Ltd., and Ward (34 and 35), in British patent 
437,171, issued October 24, 1935, ap-olied for March 30, 1935, and in French 
patent 794,206, published February 11, 1936, applied for August 27, 1935, 
have patented a process of extracting rotenone and other toxins from derris, 
barbasco and timbo roots which consists in digesting the ground root with 
alcohol acidulated with sulphuric acid. The filtrate may be neutralized 
with sodium carbonate and refiltered. The final filtrate is mixed with 
soft soap so as to obtain a semisolid product which can be diluted with 
water before use. 
Fawcett and Imperial Chemical Industries, Ltd., (139 and 213), in 
British patent 446,576, issued April 29, 1936, applied for October 29, 1934, 
and also in French patent 797,052, published April 20, 1935, applied for 
October 29, 1935, claim a process for the production of rotenone and/ or 
preparations having insecticidal value and containing rotenone, which com- 
prises subjecting the natural substances containing rotenone, to distillation 
at raised temperat-ure in a high vacuum and collecting the distillate. A 
vacuum of bet'.7een 10-2 and 10~° mm. of mercury is used. The condensate 
from the distillation may suitably be removed from the condensing surface 
by melting down, y jy scraping, or by rinsing with a solvent. An example of 
the process is as follows: Fifty parts of dry ground cube root are nixed 
with 100 parts of a linseed oil stand oil which has previously been treated 
in a high vacuum at 220° C. to remove volatile constituents. The mixture 
of cube root and oil is fed on to a heated surface or surfaces maintained 
at about 120° C. and in close proximity to a cold condensing surface, the 
whole apparatus being evacuated to about 10 mm. of mercury. A pale 
