Reports to various Correspondents. 
17 
GROUP E. 
Animals which concern Man as causing bodily injury or 
disease, both possibly of a deadly character, to (A) his 
stock of Domesticated Animals, or (B) his Vegetable 
Plantations, or (C) to Wild Animals in the preservation 
of which he is interested, or (D) Plants in the preserva- 
tion of which he is interested. 
SUB-GROUP A. ANIMALS WHICH CAUSE BODILY 
INJURY OR DISEASE TO MAN’S STOCK OF DOMES- 
TICATED ANIMALS. 
Sheep Scab. 
In answer to an enquiry from Mr. E. C. Wheler, Commissioner to 
His Grace the Duke of Northumberland, concerning the life-history 
of the Scab-mite, the following Report was sent. 
This Report was further enlarged at the request of the Land 
Agents’ Society, and appeared in amended form in their “ Journal.” * 
Sheep Scab. 
Sheep Scab is caused by three different Acari, namely : (1) Sar- 
coptes scccbiei (de Geer), var. ovis ; (2) Psoroptes communis (Fiirst), var. 
ovis ; and (3) Chorioptes communis (Verheyen), var. ovis. 
Of these three the Sarcoptes cause head scab, the Chorioptes foot 
scab, and the Psoroptes the common scab. 
Salmon and Stiles give a fourth type, Eollicula or Demodectic 
Scab ; this I have not seen in England, and, anyhow, it is of little 
importance. 
The foot scab produced by Chorioptes is rare — Zurn wrote upon it 
in Germany ; it does little harm even when present. 
The Head Scab or “ Black Muzzle,” due to Sarcoptes, appears on 
the lips, nostrils, ears, eyelids, and spreads to any part of the body 
where the wool is scanty. It is easily told from common scab : first, 
* “ Journal Land Agents’ Society,” vol. ii., p. 156-160, May, 1903. 
C 
