INSECTS AFFECTING HEALTH OF MAN OR ANIMALS, 9 
DERMAL MYIASIS. 
Various species of flies are attracted to the body by wounds, dis- 
charges from the ear, catarrhal affections, or even by offensive 
breath or watering of the eyes. They lay their eggs or deposit living 
maggots in such places. When the attackisin the nose, satisfactory 
treatment is by the use of a spray of chloroform water or a solution 
of chloroform in sweet milk (10 to 20 per cent), followed by sprays 
of mild antiseptics. Surgical treatment is sometimes necessary. 
The so-called screw-worm fly (Chrysomya macellaria Fab.) has hab- 
its similar to those of the blowflies in that it breeds in dead animal 
Fic. 7.—Conical hoop flytrap, top view. Letters designate parts as in figure 6. (Bishopp.) 
Matter. In addition, however, it often lays its eggs in living flesh, un- 
_ protected wounds, and open sores of men and animals as well as the body 
‘openings. The nostrils, especially when there is bad breath or fetid 
discharge, are frequently selected for this purpose. In this habit lies 
4 
the very real danger to man. The attack is often insidious and the 
victim unaware of the presence of the eggs until the maggots have 
hatched and penetrated deep into the tissues. When the nostrils are 
invaded, only prompt and heroic measures will prevent a fatal termi- 
lation. Such cases are not infrequent, and as this fly is the most 
undant blowfly in many southern localities, sleeping unprotected 
the open during the day should be carefully avoided. 
51863°—16—2 
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