-108- 
Linognathus setosus (Olfers), another sucking dog louse 
This louse yielded most satisfactorily to a wash of derris powder 
that was compounded for treating warbles on cattle.— Spencer (556 ) . 
Linognathus stenopsis (Burm.), a blue louse on geats 
Same as for L. africanus .--Baboo ck and Cushing (28) • 
Linognathus vitull (L.), the long-nosed cattle louse 
In field tests in Texas one dipping in a solution containing cube 
and wettable sulfur killed all stages*- U» S. Bureau of Entomology and 
Plant Quarantine (624 , p. 48). 
For treatment, see Haematopinus eurysternus .— Bab cook and Cushing 
(27); Matthysse and Sohwardt 1405) . 
Solenopotes capillatus End., little blue louse 
See H. eurysternus , Baboock and Cushing (27)) Mattiiysse and Schwardt 
(405) ♦ - 
Pediculldae 
Pedi cuius humanus oorporis Deg., the body louse 
Derris powder, dusted and rubbed into the seams of all underwear 
and uniforms, was recommended in 1941 to control body lice among men 
recruited in Canada. It caused no irritation. Derris powder, either 
dry or as a saponified wash, was very effeotive.— Spencer (556 , 557). 
"The most potent threat to people in Great Britain will not be 
from the bomb and parachute but from the bug and parasite. The louse 
is the carrier of typhus, trench, and relapsing fever— three terrors 
which have destroyed whole armies. There is over-crowding underground 
and in the public shelters. The Ministry of Health may require large 
quantities of derris if louse infeotion breakes out in the air-raid 
shelters.''— Great Britain Ministry of Health (244 ). 
Pedi cuius humanus humanus L., the head louse 
Derris powder, either dry or as a saponifleu wash, proved very 
effeotive in British Columbia.— Spencer (656) • 
