76 



FOOT-MANGE AND FOOT-SCAB. 



THE FOOT-MANGE OF THE HORSE. 



{kS.ymhiotes comrivunis var. equi). 



This mite attacks the heels and lower parts of the 

 legs, especially the hind ones, and may be present for a 

 long time, even years, before extending upon the body of the 



Fig. 40. — Mite caus- 

 ing foot-mange of 

 horse; ovigerous fe- 

 male. Greatly enl'g'd. 

 After Neuman. 



Fig. 41. — Mite causing 

 foot-mange of horse; pubes 

 cent female. Greatly en- 

 larged. Alter Neuman. 



horse. Such mites live in colonies, without excavating gal- 

 leries, and cause only a local mange or scab. The presence of 

 these, as well as the restlessness of the invaded animals, 

 shown by stamping and by rubbing one leg with the other, 

 indicates the necessity of a local treatment with the reme- 

 dies given elsewhere. 



The male of this mite measures 0.34 by 0.30 mm.; the 

 female 0.42 by 0.27.; the egg 0.16 mm. Fig. 40 shows an 

 ovigerous, and fig. 41 a pubescent female. 



The ox and goat are invaded by similar parasites, which 

 do not greatly differ from the above, nor do they require a 

 different treatment. 



THE FOOT-SCAB OF THE SHEEP. 



{Syuihiotes communis var. avis). 



This is caused by a smaller mite and is of rare occurrence. 

 It is not a serious disease, affecting only the feet and limbs 

 of the animal, and as it progresses but very slow^ly to other 

 parts it is easily cured. One sheep in a very large herd may 



