CriArTEK XVI 



Biology and Habits of Horse Flies ■*• 

 J. L. Wchh 



In various parts of tlie United States and in many foreign countries 

 horses, cattle, and similar animals suffer severely from tlie bloodsucking 

 habit of the so-called horse flies of the genus Tabanus (plate XIX). 



Plate XIX. — Tabaiiidae attacking cattle; Tahnntts phaenojis on cow's jaw, and T. 

 punctifcr on top of shoulder. (Bishopp.) 



The life history and habits of different species may vary greatly. Yet 

 tliere are certain conditions common to all species. In general, the 

 flies of this genus are to be found in or near swampy areas of the country. 



^This lecture was read October 7, 1918. 



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