PLATE XXXVl 





EXTERNAL PARASITES OF THE HORSE-After Neumann 



1. Haimatopinus macroccphalus equi, female, X13. 



2. Trichodectes pilosus equi, female, X 15. 



3. Psoroptes communis equi, hexapod larva, x6o. 



4. Psoroptes communisequi, pubescent female, ventral surface, x6o. 



5. Sarcoptes scabiei equi, ovigerous female, dorsal surface, x6o. 



6. Same as 5, but ventral surface, X6o. 



7. Symbiotes communis equi, male, ventral surface, x6o. 



a. Syinbioles communis equi, uvi^erous female, ventral surface, 



X6o. 

 9. Horse's tail Invaded by tricopliyton tonsurans, xsoo. «, «, 



mass of exterior spores; i', split summit of hair; c, cells 



of epidermis of hair. 

 TO- Tricophyton tonsurans, X 50. 



