Maggots 931 
mal’s shaking or thrusting at the affeeted part. The 
diseased area appears lifeless and spongy; when opened, 
the living, wriggling parasites are found in the decom- 
posing tissues. Infestation by maggots occurs only in 
warm weather. 
Cleanliness is. the first essential to treatment. Sheep 
with much wool should be “tagged” in early spring; 
that is, the wool should be trimmed away from the 
anal opening and vicinity, as well as from about the 
penis, so that there will be no opportunity for the 
wool to eollect filth. This will usually prevent the 
difficulty in these regions. In case a wound has been 
attacked, the dead and diseased tissue, with as many of 
the parasites as possible and the surrounding hair and 
wool, should be carefully removed. Kerosene oil and 
turpentine are effective in destroying the parasites. 
Turpentine should not be used on a raw wound, nor 
about the anal opening, as it will cause too much 
irritation. A solution of carbolie acid (one part to 
twenty parts of water) is also good. After destroying 
the larvee, the wound should be protected by tar, or by 
pure creolin or similar products. Axle-grease is also 
useful. 
THE SCREW-FLY 
In Texas and other southern regions, it is very com- 
mon for wounds upon domestic animals to become in- 
fested by the larve of the screw-fly (Compsomyia macel- 
laria). These larve are commonly called “screw- 
worms.” The adult is a small, bluish green fly, with a 
brown head, and with three black stripes lengthwise 
