504 



Joiirtial of Agriculture. 



[lo Aug., II 



DISEASES OF THE SKIX. 



iCotitiimed from page 448.) 

 S. S. Cameron. 3/.R.C.V.S.. Chief Veterinary Officer. 



II. PARASITIC SKIN DISEASES. 



I. — AiXiMAi, Parasites {coutinucd}. 



Maqge or Scabies. 



Mange in a comprehensive sense may be defined ab an inflammatory 

 skin disease caused by the presence in or on the skin of parasitic derma- 

 tozoa of various kinds. All species of domestic animals and many wild 

 species become affected with mange — not however all caused by the same 

 insects; for although different species of insect may affect one species of 

 animal every animal has nevertheless a proneness to l)e affected by a par- 

 ticular mange insect — thus the horse is most severely affected with sarcoftes 

 scabiet, cattle with psoroptes communis, sheep with scabies symbiotes oris, 

 dogs with symbiotes canis, cats with sarcoptes minor and pigs with sarcoptes 

 squamiferous. 



MANGE INSECTS. 



There are three principal groups of mange parasites viz. : — 



(i.) Sarcoptes which have their habit.it in the deeper la\ers of the 



skin of the neck and trunk. 

 (2.) Psoroptes which are on the surface and invade principally the 



region of the mane and tail. 

 (3.) Symbiotes which attack the lower parts of the limbs and extend 



upwards towards the trunk. 



