a 
8 INSECTS AFFECTING HEALTH OF MAN OR ANIMALS. ae 
half with some inert substance, such as powdered gypsum or flour. 
With the use of a dust gun or blower this substance can be thoroughly 
dusted into the runways and hiding places of the roaches. Other 
powders which have proved to be more or less successful are borax, 
used either pure or mixed with pulverized chocolate in the proportion 
of 1 part of borax and 3 parts of chocolate; pyrethrum; or a phos-— 
phorous paste, which 1s a sweetened flour paste containing 1 to 2 per 
cent of phosphorus. | 
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Tee A 
Fic. 6.—Conical hoop flytrap, side view. A, Hoops forming frame at bottom. B, Hoops forming frame 7 
at top. C, Top of trap made of barrel head. D, Strips around door. £, Doorframe. /F, Screen on 
door. G, Buttons holding door. H, Screen on outside oftrap. J, Strips on side of trap between hoops. ' 
J, Tips of these strips projecting to formlegs. K,Cone. LZ, United edges of screen forming cone. MM, 
Aperture at apex of cone. (Bishopp.) 
INTESTINAL MYIASIS IN MAN. 
The insect most often found in the intestines of man is the maggot 
of the cheese fly (Piophila casei L.), usually called the cheese skipper. 
This insect deposits its eggs on old cheese, ham, bacon, and othet 
fats. The maggots of the house fly and of other flies of similar 
habits are occasionally taken into the body by man. Blowfly mag- 
gots sometimes find their way into the intestines with meat. Fly 
ance of infested food, concerning which suggestions are given on 
subsequent pages. 
