CHAPTER XIX 

 INSECTS INJURIOUS TO CATTLE 



In this chapter it will be the aim to discuss only 

 such insects as are most frequently found on cattle. 

 The object specially sought in the same and also in the 

 following chapter on the more common ailments of 

 cattle is to aid the readers who may not previously 

 have access to information on these subjects given in 

 concise form. The student of the agricultural college 

 will be given information pertaining to them in the class 

 room, which will be far more comprehensive and com- 

 plete. In the preparation of both chapters, the author 

 has received most substantial aid from Prof. M. H. Rey- 

 nolds, D. V. M., M. D., who fills the chair of veterinary 

 science at the College of Agriculture, University of Min- 

 nesota. 



In this chapter the following subjects are discussed: 

 (i) Ringworm on cattle; (2) Warbles on cattle; (3) 

 Lice on cattle; (4) Flies on cattle; (5) Mange on cat- 

 tle, and (6) Southern or Texas cattle fever. Ringworm, 

 though not caused by an insect, is included, first, because 

 it is caused by a parasite and affects the skin, and, 

 second, because the treatment is much akin to that called 

 for in removing insects. Texas fever, viewed apart from 

 its cause, comes properly under the head of the subjects 

 discussed in Chapter XX, since it is a blood disease. 

 The medium of communicating it, however, is the Texas 

 cattle tick, hence the discussion of the tick and also the 

 fever are considered together. 



Ringw^orm on cattle. — Ringworm, sometimes called 

 barn itch, is a skin disease most commonly found in cat- 

 tle, but it may occur in horses, dogs, and also in the 

 human family. It is of two kinds, known as Tinea 



400 



