PLATE XXXVI 



EXTERNAL PARASITES OF THE HORSE-After Neumann 



1. Haematopinus macrocephalus equi, female, Xi5- 



2. Trichodectes pilosus equi, female, Xis. 



3. Psoroptes communis equi, hexapod larva, X6o. 



4. Psoroptes communisequi, pubescent female, ventral surface, x 60. 



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. 



8. Symbiotes communis equi, ovigerous female, ventral surface, 



X6o. 



9. Horse's tail invaded by tricophyton tonsurans, X2oo. a, a, 



mass of exterior spores; ^, split summit of hair ; c, cells 

 of epidermis of hair. 



10. Tricophyton tonsurans, X$o. 



