76 FOOT-MANGE AND FOOT-SCAB. 
THE FOOT-MANGE OF THE HORSE. 
(Symbiotes communis 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 Fig. 41.—Mite causing 
horse; ovigerous fe- foot-mange of horse; pubes- 
male. Greatly enl’g’d. cent female. Greatly en- 
After Neuman. larged. After 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. 
(Symbiotes communis var. ovis). 
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 slowly to other 
parts it is easily cured. One sheep in a very large herd may 
