282 
Sarcoptic Scabies 
Canis. 
Tierreich : Gerlach, 1857 = squamiferus Fiirst. (in part). 
Dorsal scales hardly longer than broad; no rugose area; notogastral spines 
long and slender; anterior arm of epiandrium feebly connected with epimeres of 
legs 3 and 4. 
$ 300-450//, x 230-350//,. 
<? 190-250 yL x 160-180 p. 
Dog , appears to be communicable to man but not to other animals. 
There is great confusion with regard to the dog Sarcoptes. This animal is, 
of course, subject to a Demodicic mange, but several authors record a 
Sarcoptic scabies of the dog, though no two writers agree about it. 
Gerlach’s canis is “ smaller than the human species with legs of a darker 
yellow-brown colour,” but he describes and figures (PI. II, fig. 11) the ? 
with two posterior rounded projections though the male has no corresponding 
‘ k cylinders.” His measurements of the $ are 300 x 225/x. Now he described 
at the same time a form from the pig which he called suis, the female of which 
had no such projections, but the male of which is described 
and figured with two “cylinders” near the generative 
opening (PL III, fig. 16). Furstenberg (1861) considered 
these two forms the same, and fuses them under the name 
squamiferus , but he omits the projections on the abdomen 
of Gerlach’s ? canis and the “cylinders” of Gerlach’s d suis 
(Furstenberg, p. 214, Pis. II and IV). Delafond and 
Bourguignon (1862) threw doubt on Gerlach’s canis be¬ 
cause of the abdominal projections, which, they alleged, 
would remove it from the genus Sarcoptes altogether, but 
they knew of a dog Sarcoptes which Bourguignon had de¬ 
scribed in 1853 (thesis for a prix de Montyon), which was 
“notably smaller than the human Sarcoptes (? 300 x 250//., 
d 200 x 160//,) but had the same form.” 
On the other hand Canestrini ( Prosp . Acarofauna Italiana, vi. p. 741, 
PL 63) describes and figures the Sarcopt from a Neapolitan dog, the female 
measuring 450 x 350//,. 
Delafond and Bourguignon (1862) performed many experiments with the 
Sarcoptes they found on the dog. Healthy dogs confined wfith mangy dogs 
caught the disease. Crusts placed on unhealthy dogs communicated it in a 
severe form. A dog powdered with the mites from the skin of another dog 
which had died of mange and then badly fed and housed, contracted scabies 
which was allowed to go to extreme lengths, but there was spontaneous cure 
on the resumption of good feeding and housing. This experiment was repeated. 
Conditions of age and race are important. Long-haired dogs favour 
sarcoptic mange, as do masterless or ill-tended dogs and chained dogs with 
damp kennels. Good housing is of the utmost importance. 
Text-figure 5. Dorsal 
scales and a noto¬ 
gastral spine of 
8. canis ( squami¬ 
ferus) (after Furst¬ 
enberg). 
