Symbiotic Scabies Acariasis in Solipeds. 171 



ting and covering the already depilated skin, makes a scabby, 

 cracked, oozing surface, or when the scabs are rubbed off it is 

 smooth, shining and unctuous. The skin is greatly thickened, 

 rigid, or thrown into wrinkles. The itching and rubbing are 

 more intense and desperate than even with the sarcoptes. 



Diagnosis is always easy because of the non-burrowing habit 

 of the psoroptes. By scattering the scrapings on a glass slide or 

 black paper in the sunshine or in a warm room and examining 

 with a hand lens, a movement of the scabs can soon be detected 

 at some particular point, and the acarus soon emerges and can be 

 recognized. It can be seen' still better with the microscope under 

 a magnifying power of 25 or 50 diameters. If no magnifying 

 lens is at hand a scab can be laid on the skin of the arm and held 

 with a bandage. In an hour or two a pricking sensation is felt 

 and on removing the crust a red papule is found with the 

 psoroptes in its centre. 



Treatment does not differ materially from that given for sar- 

 coptic mange, and it is much more promptly successful owing to 

 the non-burrowing habits of the acarus. When recent and con- 

 fined to the crest and root of the tail, a general clipping of the 

 body may be avoided, and even the hairs of the mane and tail 

 may be spared save where they are buried in the folds of the 

 corrugated skin. The same preparation with soap and warm 

 water and a brush, is requisite, and in selecting an acaricide Roll's 

 prescription of tar, sulphur, green soap and alcohol may be freely 

 used without fear of suppressing secretions and asphyxiating the 

 patient. Where the disease is generally diffused, on the other 

 hand, the other preparations are safer. 



Preventive measures are essentially the same as for sarcoptic 

 mange. Where a building, car, yard or park has become infested, 

 and is not treated with acaricides, it can only be considered quite 

 safe after a disuse of three months, owing to the great powers of 

 survival of the psoroptes. 



SYMBIOTIC SCABIES. ACARIASIS IN SOLIPEDS. FOOT 

 MANGE. GAIvE DU PIED, Fr. ; FUSSRXUDE, Ger. 



Symbiotes communis v. equi : Smaller than psoroptes ; proboscis shorter ; 

 two front pairs of limbs, very long and thick ; two posterior pairs, devoid of 

 suckers in female ; male has two caudal lobes, each with two bristles and 



