576 CLASSS1X. 
Sarcoptes LATR. Body not furrowed between the second and 
third pairs of feet. Third pair of feet remote by a large interval 
from the four anterior feet. 
Note.—Here are to be referred genera 7'richodactylus DuFouR and 
Glycyphagus HERING. 
Comp. E. Herine, Die Krizmilben der Thiere (1835), Nov. Act. Acad. 
Leop. Carol. Nat. Curios. Vol. XVII. 2, p. 573—624, Tab. 43—45. 
Sp. Sarcoptes scabiet, Acarus siro scabici L., Bononnt Observationes circa 
viventia &c. Rome, 1691, fig. 113—DE Greer Mém. vu. Pl. 5, figs. 12, 13 ; 
Ducus Ann. des Sc. nat. 2e Série, 111. Pl. xt. B; Guérin Iconogr., Arachn. 
Pl. 5, fig. 12; Scumip1’s Jahrbucher f. Med. 1852, Bd. 76. s. 204. This 
species, which has been very incorrectly confounded with the cheese-mite, 
digs into the human skin1, and causes the itch. Other species occur in 
animals. Here belongs, for instance, Sarcoptes equi (commonly regarded as 
the Acarus exulcerans L.) Herine 1. 1]. Tab. 43, figs. 1, 2, DugaRDIN 
Observ. au microscope, Pl. 16. 
See on this subject the interesting Medeclingen van Dr D. H. Von 
LEEUWEN in the Nederl. Lancet 1846, and his treatise Over de Schurft der 
Dieren in A. Numan’s Vee-artsenijkundig Magazijn, vi. 1847, blz. 52—159, 
met 2 pl. HssLINnG in the Miinchener medicinishen Zeitung 1852, Bd. 76, 
has described some new parasitic mites in plica polonica of the human 
subject. 
Note.—In this family is commonly enumerated an elongate ani- 
malcule found within a few years by Srmon in the sebaceous follicles 
of the skin of the face, which scarcely has its place here. In the 
short, conical feet, it agrees with the Arctisca s. Colopoda. 
Compare G. Simon, Ueber eine in den kranken u. normalen Haar-sdcke 
des Menschen lebende Milbe, MUELLER’S Archiv f. Anat. u. Physiol. 1842, 
s. 218—237, Tab. x1. 
Demodex folliculorum, Owxn’s Lectures on the comp. Anatomy of the invert. 
Animals, pp. 251, 252, 2nd ed. p. 444, 445. The same, or a nearly allied 
species, was found in the pustules of a mangy dog in numbers, by Mr Tor- 
PING, OWEN, p. 445. 
Dermaleichus Kocu. 
Consult Uebersicht der Arachniden-Systems, IlItes Heft 3, 1843, pp. 
122—126. 
Family IV. Notaspidea. Body defended by a horny, hard 
covering. Mandibles chelate. Palps fusiform, quinquearticulate. 
1 That this animalcule resides here, and not in the pustules, was already expressly 
announced by NyANDER, LiInN. Amoenttat. Acad. V. p. 95. 
