. • -9- • • 
ce.utiou.sly to Persian cats and long-haired toy breeds of dogs. Because of 
the excessive quantities sometimes applied to such animals, and the likelihood 
of some of it 'being swallowed,- symptoms of gastric irritation have been '/b- 
served. At times, also,- the eyes may 'become inflamed, and care should .'be 
exercised in preventing the wash cr the "powder from 'entering them. Persons 
applying the powder, should also guard against inhaling it. Infusions were 
also found, in practically every instance, to kill all ticks that attached 
themselves during the first 72 hours after the doe was bathed, and in most 
cases killed* all of those attaching within 96 hours, or sometimes longer?. The 
rotenone used was extracted from samples of Derris species from New Guinea, 
which were found to contain 5 percent of rotenone. , _ ; 
In 1939 Bishopp (_9) again recommended derris wash containing at least 3 
percent of rotenone as the most satisfactory insecticide for combating the brown 
dog tick on dogs* (See Bishopp and Smith (10, 11) p. 5.) Derris powder: 
scattered behind baseboards end other hiding places is advised when residences 
be'come infested. - 
Parasitidae 
Lasioseius pomi (Parrot) 
German and Townsend (54) in 1938 re^o^l-ed that the effect of rotenone 
extracts alone on ( Souilus.y~Lasioseras /(Parrot) or related species was not so 
great as might have been- expected, as many ticks were seen alive after an 
application, 
Pediculoididae 
P igmaeophorus sp . 
The Pennsylvania Agricultural Experiment Station (120) in 1938 reported 
that these mites were not controlled by pyre thrum and derris dusts and. sprays. 
P en thai e idee 
Halotydeus destructor (Tucker) 
Swan ( 144 ) in 1934 reported that pyre thrum dusts had been tested end that 
they killed quickly. The dust used had been diluted 1:5 with sulfur. Derris 
dust also 'killed well, but did not seem quite so effective as .pyre thrum, 
although its killing power probably lasts longer. 
. . Sarcoptidae' 
Chorioptes bovis (Gerl.) 
Gotze ( .68 ) in 1933 reported that Derrila vol, India— E6 ten on— Lasting and 
India-Gesamtextrakt-Losung, both at the rate of 20 cc. to 1 liter of cold 2.5 
-percent-soap solution, end the Ind.ia— sine— Rotenone— Lbsung containing the 
