26 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
EXPLANATION OF PLATES ILLUSTRATING THE ANAL PLATE 
OF FEMALE. 
(All of these drawings are of the same magnification (X 400) and were made by 
the writer.) 
PuaTE 1. 
Fie. 1. Tetragonyssus spiniger (Ewing and Stover). 
2. Tetragonyssus bermudaensis (Ewing). 
3. Ceratonyssus ceratognathus, new species. 
4. Serpenticola serpentium (Hirst). 
5. Ichoronyssus sternalis, new species. 
6. Ichoronyssus isabellinus (Oudemans). 
7. Leiognathus crosbyt (Ewing). 
8. Leiognathus constrictus, new species. 
9. Liponyssus triangulus, new species. 
10. Liponyssus bacoti (Hirst). 
PLATE 2. 
Fia. 11. Liponyssus pacificus, new species. 
12. Liponyssus americanus Banks. 
13. Liponyssus occidentalis, new species. 
14. Liponyssus canadensis Banks 
15. Liponyssus montanus, new species. 
16. Liponyssus tenuiscutatus, new species. 
17. Liponyssus bursa (Berlese). 
18. Dermanyssus gallinae (Redi). 
19. Dermanyssus americanus, new species. 
20. Allodermanyssus sanguineus (Hirst) 
