116 
Sarcoptes 
The body. The general shape of the body may be seen from Fig. 1. Subject 
to considerable individual differences it is roughly oval, and widest slightly 
behind the middle. It is irregularly convex above, flatter beneath and of a 
Fig. 1. Sarcoptes scabiei var. equi, dorsal surface of adult female: A 1,2, anal setae; an, anus; 
ba, bare area; cap, capitulum; co, cone; cp, copulatory papilla; D 2, second dorsal seta; 
ep, epistome; L 1, 2, lateral setae; ng, notogaster; nth, notothorax; pi, plastron; r, integu¬ 
mentary ridges; sc, scale; sp, spine; st, ring-shaped rudiment of stigma; I-IV, legs, 
x 220. 
translucent whitish colour, except where more strongly chitinized parts which 
lie on or near the surface are apparent by reason of their brown colour. The 
surface of the mite is covered with fine parallel ridges. One may generally 
