P. A. Buxton 
151 
seta D 2. The normal D 2 is present on both sides, and in its normal position: 
lateral to it on the left side is a seta one half of its length, and much finer. 
This anomaly is perhaps worth recording as the great setae are believed to be 
of considerable systematic importance. 
ep 
0- 25mm. 
Fig. 9. Sarcoptes scabiei var. hominis, adult $. Part of dorsal surface showing reduplication of 
seta D 2 on left side: capitulum and legs omitted, co cone, D 1 and D 2 dorsal setae, ep epi- 
stome, pi plastron, sc scales. 
REFERENCES. 
Beatty, W. (1913). A Case of Norwegian or Crusted Scabies. Brit. Journ. Dermatology, 
xxv. 56-60 (3 figs.). 
-(1915). A Second Case of Norwegian Scabies. Ibid, xxvii. 404-407 (3 figs.). 
Buxton, P. A. (1921). The External Anatomy of the Sarcoptes of the Horse. Parasitology, 
xiii. 114-145. 
Canestrini, G. and Kramer, P. (1899). Demodicidae und Sarcoptidae. Das Tierreich, 
7 Lieferung. 
Furstenberg, M. H. F. (1861). Die Kratzmilben der Menschen und Thiere. Leipzig. 
Hartzell, M. B. (1917). Diseases of the Skin. Philadelphia. 
Hirst, S. (1920). Arachnida and Myriapoda injurious to Man. British Museum, Economic 
Series , No. 6. 
Hyde, J. N. and Montgomery, F. H. (1905). A Practical Treatise on Diseases of the Skin. 
London. 
Megnin, P. (no date). Les Acariens parasites. Paris (Masson et Cie). 
Sequeira, J. A. (1915). Diseases of the Skin. London. 
Sutton, R. L. (1919). Diseases of the Skin. London. 
Warburton, C. (1920). Sarcoptic Scabies in Man and Animals. Parasitology, xn. 265-300. 
