134 Sarcoptes 
say that in shape they resemble a foot, with two sharp projections at the heel. 
The tocostome and its associated structures are of course absent. The ventral 
setae (FI to 4) and the lateral setae (L 1 and 2) have the same relative 
lengths as in the female, but V 3 is much more conspicuous, for instead of 
being concealed among integumentary ridges it is set on a flat place close to 
the epiandrium; the seta L 2 arises as in the female from a papilla, but its 
position is more distinctly ventral than in that sex. The third and fourth 
epimeres (e III and e IV) are united on each side to one another. The third is 
Fig. 13. Sarcoptes scabiei var. equi. Adult male, dorsal aspect. A 1-2, anal setae; an, anus; 
co, cone; D 1-2, dorsal setae; L 2, second lateral seta; pi, plastron; ppl, posterior plastron; 
sc, scale; sp, spine; 1, II and III, legs (in the specimen figured the fourth leg is not visible 
from above). 
very much bent, nearly transverse in position and provided with a wide 
flange; the fourth is straight and short. At the point at which they are united 
with one another, they have a definite surface by which they articulate with 
the epiandrium. In order to show this clearly I have very slightly separated 
these structures in Fig. 14. The epiandrium and the male organ is discussed 
separately below at some length. The capitulum of the male is similar to that 
of the female except that on the under surface the seta C 3 is slightly and C 4 
considerably longer. In Fig. 13 the cheek-pieces have been displaced laterally 
