DESCRIPTION OF PLATES. 



PLATE III. 



Sarcoptes minor, var. Oati. 

 1. — Adult female, ventral surface x 250. 

 2. — Male, ventral surface x 250. 

 3. — Nymph or immature female, dorsal surface (it very closely resembles the 



adult female, except that in this latter the anus is nearer the centre 



of the back), x 250. 

 4. — Six-legged larva, dorsal surface x 325. (After Fiirstenberg. The anus 



has, however, been drawn on the dorsal instead of on the ventral 



surface). 

 5. — Rostrum of S. minor, var. muris, x 600. (After Megnin). 



PLATE IV. 



PSORERGATES SIMPLEX. 



1. — Male, dorsal surface. 



2. — Male, ventral surface. 



3. — Adult female, ventral surface. 



4. — Nymph, or immature female, ventral surface. 



5. — Larva, ventral surface. 



6. — Rostrum, showing palps, mandibles and tongue. 



7. -Egg. 



All the figures magnified 435 times. 



