PARASITIC DISEASES. 



809 



six weeks the perfect insect escapes from its shell, and the female 

 soon deposits her egg, and then dies. Another species, the tabanus 



1 



o 



OS 



If- 



a 



i 



■ 



! 

 i 



f 





bovinus, is shown in Fig. 1068. The larva may be removed from the 

 tumor, or " warble," by pressure, when the results of its presence 

 will gradually disappear. 



