0. Warburton 279 
rounded behind, extending from the head to the fourth thoracic ring. 
Epiandrium firmly fused with epimere. 
This Sarcoptes is the cause of “ Norwegian itch - ’ in man, and lives in 
innumerable superimposed burrows in the crusts. Chaetotaxy like that of 
the common human Sarcoptes , but the folds of the body 
are more marked. $ 415 x 341 p,. The head is compara¬ 
tively large. 
The male is rather smaller than that of the common 
human Sarcoptes —172 x 153 fi. (Furstenberg, p. 212, PL 
V.) 
The disease of “Norwegian itch” was (according to 
Railliet) first recorded by Boeck and Danielssen in 1848. 
It is characterised by gigantic crusts. Sometimes these 
arise at the outset, but more often they do not appear 
for several years (3-9). Callosities 1-6 mm. in thickness 
appear on the palms of the hands, the soles of the feet, 
the wrists, elbows and knees. The scabies may extend to 
the face and the hairy scalp. 
Megnin thinks this parasite identical with lupi , but Railliet considers 
them too unlike. 
Furstenberg considered the peculiar severity of the disease due to the 
particular Sarcoptes at work, but Hebra attributes it to special susceptibility 
of certain subjects, and considers the parasite to be nothing but the common 
human Sarcoptes. It has been noted not only in Norway, but in France, 
Austria, Germany, Denmark, Russia and Turkey. 
Text-figure 3. Exam¬ 
ples of dorsal scales 
of S. scabiei-crusto- 
sae (after Fursten¬ 
berg). 
Lupi. 
Tierreich : Megnin, 1880. 
Dorsal scales pointed; no rugose area; notothoracic cones long and blunt. 
<J very elongate (langgestreckt). Epiandrium firmly united to epimere. 
? 370-400p, x 280-300/x. 
<J 270 x 160 /a. 
Canis lupis. France. 
Megnin’s measurements are: 
$ 400 x 280/x. 270 x 210/*. 
He found it in 1875 in four young wolves (at the Museum de Paris) which 
had their hides covered with thick, yellowish, moist crusts, nearly a centi¬ 
meter thick in places. Transferred to a horse, they gave rise to a scabies of 
exactly the same nature—even to the characteristic smell. Megnin considered 
it the cause of “Norwegian itch*’ (vide ante) but his view is not universally 
accepted. 
