MUSC^ (HOUSE FI,Y AND ALUES). 



Muscse don't bite, but suck and through their numbers and irritation may 

 cause sores. Horn fly, very injurious. 



The genu.s musca are not furnished with perforating stylets, 

 but only a .soft sucking proboscis, by which they imbibe perspira- 

 tion and the exudations of wounds and abra.sions. On the sound 

 skin they cause irritation by their numbers and persi.stence, the 

 itching or formication being mo.st annoying to an animal that is 

 nervously sensitive. On wounds, however, they are irritating, 

 by their constant titilation, and by the transfer ot infection not 

 only from wound to wound, but from putrid organic matter to 

 wounds, and from wounds to food and water. They lay their 

 eggs in collections of manure, in which the larvae are produced. 

 The common species of mu-scse are named in the list of diptera. 



The Haematobia Serrata or Horn Fly has lately spread over 

 North America causing great irritation to cattle and especially 

 around the horns and head. Its suctorial proboscis is not pierc- 

 ing, yet by their numbers and the persistency of their attacks these 

 flies may produce extensive lesions of the skin. The eggs and 

 larvae are found in cow manure and their reproduction must be 

 arrested by applying lime and other agents to the dung. 



GLOSSINA MORSITANS. "TSETSE." 



" Tsetse," an African fly causing infection of nagana especially. 



This fly is a little larger than the house fly, with a proboscis 

 twice as long as the head and its piercing stylet barbed, its thorax 

 orange with four black lines, and its abdomen yellowish white 

 with black spots on the four last segments. The wings are 

 smoky. It prevails along damp lands and river bottoms in Cen- 

 tral Africa. It attacks man and beast, striking them like a flash, 

 and instantly perforating the skin and drawing blood. Living- 

 ston, Oswald and others considered its bite as fatal to all domestic 

 animals except the elephant, the ass and the goat, the symptoms 



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