PARASITOLOGY. 21 
Animals Attacked.—They produce irritation by their 
rumbers upon the skin or wounds of any animal, and 
by imbibing the exudate and perspiration. They 
carry germs from the wounds or excreta of one ani- 
mal to another. 
Musca VomitToria (Vomitoria—causes vomiting, musca—fly.) 
Synonyms.—Blow-fly ; bluebottle fly; calliphora 
vomitoria. 
fTistory.--Found widely distributed. 
Description.—The fly is about four times the size 
of ahouse-fly. Its eyes are brownish in color; thorax 
and abdomen bluish green. 
Lite. Cycle.—The eggs are oval in shape and white 
in color. They are deposited on decomposing ani- 
mal and vegetable matter, in the wounds of animals 
and in fresh manure and garbage. When the weather 
is hot the eggs hatch in a very few hours. The 
larvae are called maggots, and develop rapidly. 
On reaching maturity the maggots, if in a wound, 
drop to the ground and pass through the pupal stage 
in a short time. 
Lucrr1a MACELLARIA. 
Synonyms.—Screw-worm fly ; compsomyia macel- 
laria; cayor fly. 
History.—Found throughout the world. Its great- 
, est damage is done in hot 
climates. 
Description. — The fly is 
about one-half inch in length 
and of a bluish green color. 
a, Ventral View; b, SideView. Jt has three longitudinal 
black stripes on the dorsal surface of the thorax. 
