4 - 
Test's with alcoholic 3xtrac':s and T)C".vclerp arc also recorded against 
Macro siph ui. lir io(3e..drl Mon., Mac iosiph-Uiii ( lllinoia ) sp. , A-oliis he li ant hi 
Men,, Bliop£:J os J,pxi\im psevdohra-csirae Lavis, Aphi s goss^^pii Glover, and Aphis 
spiraecola patch. 
Derris was applied as a powder agairst variof-s insects with the 
following resvJtc: 
Iioz fleas: i^ight dogs badly infested with fleas, Ctenocephalides 
cants Curt., were dusted tLorcagLly. The material was applied with a 
shaker and well rubhed into the hair with the hards. At the end of 43 
hourn nc living fleas 'verc observed. Several dead ones were .seen still 
clin^.-inc to the hairs. 
Chickon lice: Twelve hens, ba,dly infested with several species of 
lice (I.lallophaga) were thorout^hly treated with the powder, which was vfcll 
rubbed in thr^^ugh the feathers. When the hens were examined 2 or 3 da,ys 
later 'chey wo-.-e fre' from lice. 
Chicken raitos; Fhcn this powder \vas freely dusted over the chicken 
mitos, Lc rman; ^ s su s j j^allina c Dogcer, cox.fined in ^ars, all v/ore killed within 
24 hours, but when ii.sed under practical corditiors in a Dadly infested 
chicken ho\iso all the nitos "fcm n.-)t killed. 
Bedbugs: Dorris was tested against bedbugs, Cimex loctularius L, , 
by placing 2Q bugs in a jar with a quantity of cxc.-lsior rnd then thor- 
oughly dusting the contents of the jar. In nine tests unror tnose vcrj'- 
severe conditions 24.4 percent of the br^gs were killed in 24 hours and 52,8 
percent in 4 days. This material v/ould be of no practical value against 
bedbugs, 
Hoachjs: Six small cages wore thoroughly duster! and 20 roaches, 
31 a:.tcll a gCx-'manica L. , wore placed in each cagu. At the end of one week 
u-r averrge of 57,5 percent o'^ the roaches \"orc dead, which indicat'.-s ohat 
this mo.terial v/ov.ld be of very litt].e val\ie Tmdor practical conditions. 
House flies: In cage tests, v/hcre house flies, Musca domes tic a 
L. , v/ere dusted in ordinary?' flytraps about 10 inches high, all ver- d'.'ad 
or Inactive -.dthin 24 hours. In' room tests, where the pov.-dei' was fre.ly 
blown into the air 'nd all p:',rt3 of the room with a small hand dust gun, 
all the flies wore dead at the ord of 16 hoa:^s. In one test several 
hundred flies v/erc liberated in a room wnicn had b.en thoroughly dusted 
7 days before. Twenty-four hcu"^s later very fov/ active flies v/cre to 
be seen, and on the sorcn^'. d-^^.^' oiil;^ three or four were living. 
Plar.t insects: Dorris applied as a dust was of no value against 
the mealybug Psoudo coccus citri Pisso, tne greenhouse orthesia, Orthczia 
insignis Dougl . , rud spiders, Tctranych us bimacu latus Harv. , and the 
crawling yourig of the oj/stershell scale, Lepidesaphes ulmi L. ; but it was 
effective a.gainst nastr.rt:'um aphids, Aphi s r umicis L. , and the green apple 
aphid, Aphi s pomi Degecr. 
