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 Lineola (Linea — line). 



Syiioyiym. — 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. 



Life Cycle. — The life cycle is similar to that of the 

 Tabanus Atratus, passing its oval, larval and pupal 

 stages in moist places. 



Ajiimals 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 in color. 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. 



