140 
Sarcoptes 
Figs. 19 and 20. Sarcoptes scabiei var. equi. Dorsal views of immature female and of nymph 
respectively. A 1-2, anal setae; an, anus; ba, bare area; co, cone; D 1-2, dorsal setae; L 2, 
second lateral seta; sc, scale; sp . spine; st, probably rudiment of spiracle; III and IV, termi¬ 
nal setae (H 1) of third and fourth legs. 
