PARASITIC DISEASES. 



163 



2. Head Scab. 



Sarcoptes scabei ovis. 



This is the smallest of the three varieties of 

 scab mites. It usually burrows under the skin 

 around the nostrils first, causing small light pim- 

 ples. The sheep scratches its nose as though in- 

 fected with the "grub." 



This is not a common disease, and "hand 

 dressing" with any good dip will 

 usually clear up the trouble. 



3. Foot Scab. 

 Symbiotes scabei ovis. 



These are rather large mites, 

 and cause irritation on the feet and 

 legs. The symptoms are biting 

 SHEEP LOUSE and stamping, with crust - like 



(Trichodectes formations. 



s p h a, e T o- -r,, , -. . - 



cephaius.). This malady is a rare one, and 

 Adult female, i s treated by applying a lather of 



enlarged. J T 1 J ./ ,, 



(mV G ' Neumann ' soap-suds or olive oil to loosen the 

 crusts, and then scrubbing with a 

 ten per cent, solution of creolin. 



In all forms of scab, of course, the pens or 

 corrals must be disinfected, if the work be done 

 during the winter season. 



4. Sheep Ticks. 



Melopliagus ovinus. 



This is a six-legged, brownish-colored, mot- 

 tled parasite, resembling a wingless fly. It spends 

 its entire life on the sheep, the female laying 



