﻿THE CATTLE GEUBS OR OX WAEBLES 



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sore and tender from the penetration of the larvse, the animals are 

 more easily aroused and terrorized. 



After a herd has been attacked for a few days in spring, it is only- 

 necessary to have a single fly begin to oviposit on an animal in order 

 to start the whole herd from pasture to some protected place. When 

 water is at hand it furnishes the preferred and most effective pro- 



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toction. Animals have been observcfl lo remain standing in the 

 wjitor prfifticidlv all day when adults of //. linedtKvi were numerous, 

 and apparently 'without ever being molested by flies (fig. 5, r), oven 

 thougli tlie water was not more lliaji a few inelies deep. Sliade offers 

 eonsidecable piotertion and is iisiuilly songlit in tbe al)s(Miee of water. 

 (Fig. 5, d.) II. horin is less easily repelle<l either by water or shade 



