Q§ ANM AI. IMM'nKTS Ol' I )KI 'A Kl M I :.\ I" ( H' A( ; li KTI.Tl ' K K. IIC'.T 
I'lc. The iiisiM ts nw spniycd in a iM-^ulalcd air stream and allowed to recover 
iu a ventilate<l cabinet. Initial elYect and rai<- of r«'C(.very from median lethal 
doses are used as < riteria of toxic ity. 
.\n insect olfactometer has been desi;;ned and built that will aid in (K*ter- 
minint the relative attraction or reiwllence of chemicals, and various odor- 
iferous substances can he rather accurately measured. 
In these studies a moderately satisfac tory method of pnulucinu laryje numU-rs 
of staldellies was devclojicd. .Vdults are fed acidulate<l beef blood, and th*' 
larvae are r(^ared <»ii a nicdinm of a moist mixture of crimped oats and rotten 
straw. 
SHEEP TI( K 
Studies on the biolojjy and habits of \fi Iftitfiiif/iix (n nins /... an imi>ortant 
northern parasite of sheei). indicate that during the last 1.") to '3) years a strain 
of the insects has developed which will withstand the hot, dry weatlu'r of 
the Southwest and that it is rapidly beccuniiiK a serious problem upon the 
ranj^es of that secti<»n of the coiuitry. Preliminary tests on the control of 
this pest have shown that M'J.l-mcsh w'ettal)le sulphur used as a dip is elTe<-tive 
in destroying all the adults infesting; an animal, but lliat it is not etTective in 
killin:; ]>uj)ae. 
TI( KS AFFECTING MAN AND ANIMALS 
Tests to determine the etticacy of methods usually empbtyed in killing the 
American doj^ tick and the winter tick show that the fully en;:<u%red females 
of these two species are very resistant to the chemicals usually employed to 
kill ticks. It was found, however, that derris i)owder containing; from 1 to :» 
percent of rotenone was effective in killin;; all but the en.i;or;ced females of the 
American doj: tick and that derris i)owder and devil's shoestring containinj: 
approximately the same amount of rotenone was satisfactory in riddinir horses 
and cattle of tlie winter tick. From 4 to \) ounces of derris powder or devil's 
shoestring; was reipiired to treat an adult horse (u- cow. 
liecause of the increasinj; importance of Uocky Mountain spotted fever in 
the East, investij;ati()ns are under way to determine methods of (U'stroyinj: 
the tick vector ( l)< rmaccntor nn 'nthUix) over relatively lar;:e areas. These 
studies are concerned princii)ally with the di'structiou of the ticks on wild 
and dtimestic animal hosts and the use of insects parasitic on the ticks. 
In order to place work on the eradication of the soutln'rn cattle ti<'k 
{ lloiiitliil nx (niniilatiix (nistralix Fuller) in Puerto Kico <)n a sound basis a 
study of the h<»st relations, habits, and life history of this tick was hejcun 
in cooperation with the Puerto liico Reconstruction Administration and tlie 
P.urcau of .\nimal Industry of the United States Department of .\uriculture. 
HOUSEHOLD AND STORED-PRODl ( T INSE( TS 
< 'onsiderabb* work was done in assemblin^^ and publishing informaiion on 
the control of co<kroaches. bedbujrs, ants, clotln^s moths. cariMH beeth's, tieas. 
and other household inscM ts to meet the needs of the P.ureau in answerinir 
llnnisands of recpiests from individuals, exterminatiuf; comi)anies. .uid com- 
mercial concerns for methods of c-ombatimr these i)ests. 
('o<»l>erat ion has been extended the custodians of the various Federal build- 
injrs and to cpnirtermasters charLred with protect inir I'urni^biiii:-. fabric s, and 
foctdsfulTs subject to insect at t tack. 
Inspections wcu'c made of c-ertain brush-ma nufact urinjr i>lants .-uid whole- 
sale houses in .Maryland. Viririnia. North < arolina. South ('arc»lina. (leor^ria. 
and .\labama for infestations of the furniture* c arpet beetle^ { Antlnnmis ntrtur 
( sy.l to determine the extent of s])read of this rec-ently introduced and serious 
jiest. ,\d\ ice on methods of control was jriven to the companies concerned. 
The brush factory <»f the Fech'ral P.ureau c»f Prisons .it I'ort l.eavcMiworth. 
Kans.. which was heavily infested with this ImmMIc. was fumii:at<Ml under the 
tec-hnical direction of a rei)resentat i\ c c»f the P.ureau. 
A laru«> nundter of tests, chiefly in c-oc»i)erat ic»n with the .\rmy and Navy 
cpnirtermasters and the FcMleral Trade ( 'onunission. h.ive been tuade to deter- 
mine- the etTec t iveness of various mol h-i)roofini: sohuions feu* prcvtec ting f.-ihrics 
:i;;ainst damage by moth and c ;irpcM beetle^ larvae. Th«» results revt'.-il a distinct 
imiiro\c'Uient in the sc»lu(ions now employed by commercial conccM'us over th<»so 
