20 PARASITOLOGY. 
during the warmer parts of the day. By means of 
its powerful proboscis it pierces the skin and sucks 
the blood. Often a drop of blood oozes from the 
point of puncture after the insect has left the animal. 
They do not attack the animal in swarms, as does 
the buffalo gnat, nor is the bite so poisonous. 
Horses and cattle will flee from the buzzing sound 
of the fly. 
TABANUS JLINEOLA (Linea—line). 
Synonym.—Green-head horse-fly. 
History.—Found in all parts of the United States. 
Most abundant in the prairie districts. 
Description.—This fly is about the size of the honey 
bee. Its head is provided with a powerful proboscis 
for sucking blood, and is a brilliant green. Its ab- 
domen is elongated and brownish in color. 
Lite Cycle.—The life cycle is similar to that of the 
Tabanus, Atratus, passing its oval, larval and pupal 
stages in moist places. 
Animals Attacked.—They attack horses and cattle 
during the warm part of the day. They do not fly in 
cold or damp weather, and die with the frosts of au- 
tumn. They do not make their attack in large numbers. 
Musca Domestica (Domus—a house, Musca—fly). 
Synonym.—House-fly. 
History.—Found in all parts of the world. 
Description.—Medium size; grayish incolor. Its 
head is provided with a trumpet-shaped suctorial ap- 
paratus for sucking up liquid substances. 
Life Cycle.—Oviparous. The eggs are oval in 
shape and white in color. They breed in manure 
and door-yard filth. 
