290 Sarcoptic Scabies 
of other species—horses, cats or goats. Cases are, however, quite frequent, 
at all events in the British Isles, of a sarcoptic disease in cattle where no 
such origin can be traced, and until further investigation it must be held that 
a form of Sarcoptes exists with quite as sound a claim to the specific or varietal 
name bovis as have the other forms found on domestic animals to their 
respective titles. 
Though the ox Sarcoptes has not been described and named, its occurrence 
has been frequently noted within the last 20 years, and there are at least 
two figures of it. M’Fadyean (1900, p. 73) gives an illustration of it which 
he states (in a footnote, Ibid., xiii. p. 79) is a microphotograph, showing that 
it is an obvious Sarcoptes , and apparently proving that it possesses the 
unusual characteristic of three pairs of anal hairs. The second figure, also 
a microphotograph, is given by Williams (1917, p. 77), but the anal hairs are 
not distinct. I find, indeed, that the existence of a bovine sarcopt is no longer 
considered doubtful by veterinary surgeons, and that some economic ento¬ 
mologists are acquainted with it. It seems to be quite common in the north 
of England and in Scotland, and my friend Dr Stewart McDougal goes so far 
as to say that if he requires Sarcoptes for teaching purpose* he finds cattle 
the most convenient source of material. It is clear that an}/ investigation 
undertaken to determine the affinities between the sarcopt of man and those 
of domesticated and wild animals cannot afford to neglect the hitherto un¬ 
described form which affects cattle. 
Among the scattered and fragmentary records which possibly concern 
this sarcopt may be mentioned that of Bieler (1892) of Lausanne. He con¬ 
tracted a very severe form of scabies through carrying in his pocket, w rapped 
in paper, some hairs taken from a mangy bison. 
Notoedres Railliet 1893. 
The Tierreich definition is: 
Male without anal cylinders, $ without copulation tubes. Long unjointed 
ambulacra on the two anterior legs of ? and on the two anterior legs and the second 
posterior leg of the <$. Anus dorsal. 
Oviparous parasites of mammalia. 
Megnin (1893, p. 145) says that N. minor differs from S. scabiei by smaller 
size, rounder body not showing any folds or constrictions, dorsal anus, and 
concentric undulating ridges in place of dorsal scales. 
There appear to be two species of the genus (or subgenus) A otoedi es, 
minor and alepis, of which the first presents two varieties. 
N. minor Fiirstenberg, 1861 (Syn. S. cati Hering 1838, catorum Kiichen- 
meister 1855, cati and cuniculi Gerlach 1857, Sarcopte notoedre Delafond 
and Bourguignon 1862, S. notoedres Megnin 187 6 , felis Gerlach 1877). The 
scales are represented by concentric undulating lines round the dorsal anus. 
There are four slender spines on either side of the notothorax and six stronger 
