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Figure 1. Capitulum of Psoroptes equi. A ventral and B dorsal aspects, b.a. bare area of basis 
capituli. b.c. basis capituli. ch. chelicera. c/.y. dorsal fold of integument. J . finger-like processes 
of palp. k. keel-like structure, p. palp, si—3 setae. Camera lucida drawing, magnification 
x 500. 
Figure 2. Mouth-parts of Psoroptes equi. A right palp, and basis capituli, median aspect after 
removal of chelicerae and left palp. B right palp, ventral aspect, with finger-like processes 
spread out. C chelicera seen laterally, ap. apodeme, for attachment of muscle. /. finger-like 
processes at end of palp. h. hooks on both members of chelicera. si and 2 setae. (s2) base of 
second seta on ventrolateral aspect of basis capituli, seen by transparency. Camera lucida 
drawing, magnification x 500. 
