CHAPTER XVI 



Biolog}^ and Habits of Horse Flies ^ 

 J. L. Webb 



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

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

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



Plate XIX. — Tabanidae attacking cattle: Tabanus phaenops on cow's jaw, and T. 

 punctifcr on top of shoulder. (Blshopp.) 



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

 there 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 counti-y. 



*This lecture was read October T, 1918. 



236 



