- 25 - 
M, marginatu s Scudd. 
Armitage (25) , Parker (152), Wilson G&Z). 
M. mexicanus devastator Scudd., the devastating grasshopper 
Hinman and Cowan ( 21 , 8 ) . 
M. mexicanus mexicanus (Sauss.), the lesser migratory grasshopper 
Armitage (25), Brett and Bhoades (ij£) , Butcher eji, aJL. ( 60) , 
Brown (ij£) , Brown and Hurtig (il) , Hinnan and Cowan ( 218 ) . 
Munro et al. (222), Parker (25Z), Bhoades and Brett (288). 
Severin (413). 
Schistocerca american a (Drury). the American grasshopper 
Griffiths and King &2£), Griffiths fit &. (128), King and 
Griffiths (262), Thompson and Griffiths (454) . 
Zonocerus elea ans (Thunb.) 
legans 
M)T 
Petty (363 
Chlordane has "been recommended for the control of grasshoppers by 
the state entomologists of California (25) , Georgia (382). Illinois (2J4) , 
Indiana ( 375-378 ). Missouri Q28, 2§i) . Oklahoma (222) , South Dakota 
(4l6) , and Wisconsin ( 5 , 03 . 505 ). Young grasshoppers may "be controlled 
"by 1/2 pound of chlordane per acre hut the full grown ones require 1 
pound per acre. Emulsions have given the "best results, water -wet table 
powders have been next, and dusts have been least efficient. The dusts 
wash off more easily than the other two. If sprays have time to dry, 
they will not wash readily. The treatments will remain effective for 
about 10 days. 
The U. S. Bureau of Entomology and Plant Quarantine in February 1950 
recommended chlordane for grasshopper control; 0.5 to 1 pound per acre 
when applied as a spray and 0.75 to 1.5 pounds per acre when applied as 
a dust. In the bran-sawdust poison bait mixture 0.5 pound of chlordane 
may be used in place of 6 pounds of sodium fluosiiicate. — Wakeland and 
Parker (258, Ijgfi, 481 ). 
Blattidae 
Blattella germanica (L), the German cockroach 
Purified chlordane dissolved in a mixture of 4 volumes of reagent 
grade benzene and 1 volume odorless kerosene and tested for direct con- 
tact toxicity on 4th and 5th instar nymphs caused 100 percent mortality 
at 20 micrograms per square centimeter. The median lethal deposit 
(LD-50) was 1.7 micrograms per sauare centimeter. — Erown, Wenner g and 
Park Q2). 
When applied directly to adult female roaches chlordane gave 87 per- 
cent mortality when a 5.0-percent dust was used with a deposit of 3.0 
micrograms per square centimeter. In container dusting a deposit of 
0.5 micrograms per square centimeter of a 0.5-percent chlordane dust with 
a deposit of 0.75 micrograms per sojuare centimeter gave a mortality of 
90.0 percent. DDT and sodium fluoride were less toxic and gamma-BHC was 
more toxic than chlordane. — Kiswander and Davidson ( 352 ) . 
