-75- 
Triatomidae 
Rhodnius sp. 
Pieoes of filter paper were treated with a range of doses of pure 
DDT, using a volatile solvent, so that the surfaces presented to the in- 
sects were dry. All insects were exposed at the same temperature and 
for the same period. The lethal dose for Rhodnius sp* was wish above 
10 mg. per square centimeter of DDT.— Buxton (lOOj * 
ANOPLURA 
Haezoatopinidae 
Haematopiaas e-einl (L«), the horse sucking -louse 
DDT ie a contact poison*— Domenjos ( 135 ) * 
Kaenatopinns euryotemus Nits*, the short-nosed cattle louse 
Preliminary laboratory tests indicated that lioe are very susceptible 
to DDT* A heavily infested cow was dusted with Gesarol A dust and an 
examination 2 days later revealed 100 percent kill of short-noted oattle 
lice*— Boss (308) * 
Three 2 -year old heifers moderately infested with lioe were treated 
with a 10 peroent DDT-pyrophyllite dust* In 24 hours more than 90 per- 
oant of the lice had been destroyed; 3 weeks later a light infestation 
of newly hatched lioe was observed and after 5 week* the infestation had 
disappeared oompletely*— Monro and Khapp (269) • 
Same as for H* asinl *— Domenjog (135 ) • 
Haematopinus pillferus 
Same as for H* aslni .— Domenjoz (135 ) • 
Unidentified species 
Benzene hexachloride proved at least as effective as DDT against 
guinea pig lioe*— Taylor (343 ) • 
Haematopinus suis , the hog louse 
Hog lioe were controlled by spraying hogs twioe at 14-day intervals 
with a 1 -per cent DDT suspension (8 pounds of 10-percent DDT in pyrophyllite 
pins 2 ounces of wetting agent in 10 gallons of water) • EOT does not 
destroy eggs and the animals suffered no detrimental effect*— Shull et al * 
(315)* 
