KEYS. 



The following Keys are purely artificial and are as non- 

 technical as it is possible to make them without sacrificing accur- 

 acy. Only the recent forms are considered in the Keys : 



1. Body without scales or plates. — Batrachia. 2. 

 Body covered with scales or plates. — RepTilia. 35. 



2. Adult with heavy, external gills. Over lyi feet in length. — 



Nedurus maculatus — p. 106. 

 Adult without external gills. 3. 



3. Adults with tails developed. — Urodki<a. 4. 

 Adults tailless, hind legs longer than anterior pair and fitted for jump- 

 ing. — Salientia. 24. 



4. Length over 1% feet. Body large and heavy. — 



Cryptobranchus alleganiensis — p. 107. 

 Length under \% feet. Body small and slender. 5. 



5. Whole of body bright vermilion red. 6. 

 Body not bright vermilion red. 7. 



6. Length 3^ in. , Body slender. A row of large spots along the sides. — 



Dietnydylus vindescens miniaitis—p. 116. 

 Length 6 in. Body heavy, sprinkled with small, black dots. — 



Spelerpes ruber ruber -■p. 114. 



7. Toes 4-4. Brown, whitish below. — Hemidadylutn scutatum — p. no. 

 Toes 4-5. 8. 



8. Costal grooves under 13. in number. 9. 

 Costal grooves over 13 in number. 14. 



9. Length under 4 in.-^ Amblystoma opacum — p. 107. 

 Length over 4 in. 10. 



10. Body with yellow spots or blotches. 11. 



No yellow on body. With bluish spots or uniformly blackish above. 13. 



11. Length under 6 in. Yellow spots rounded. — 



Amblystoma pundatum — p. .108. 

 Length over 6 in. Yellow in blotches of irregular contour. 12. 



12. Tail but little longer than head and body. — 



Amblystoma tigrinum — p. 108. 

 Tail much longer than head and hodiy. -^Amblystoma xiphias — p. 109. 



13. No spots ventrally. — 



Amblystoma Jeffersonianum- Jeffersonianum — ^p. 109. , 

 Whitish spots below. — Ambly stoma jeffersonianumplatineum — p. 1 10. 

 14'. Costal grooves niimerous, 16 or over in number. 15. 

 Costal grooves 13-14 in number. 17. 



15. Without red dorsal band. 16; 



With red dorsal line. — Plethodon cinereus erythronotus^--^. in. 



16. Small, 3}^ in. in length. — Plethodon cinereus cinereus— pi in.. 

 Large, 6 in. in length. — Gyrinophilus porphyriticus — ^p. 112. 



17. Length under 3>^ in. 18. 

 Length over ^yi. in. 19. 



18. A light bar from eye to angle of month; white below.-^ 



Desmognathus ochroph.aea-^p4 114.. 

 ; No light bar; yellow 4)elow,—» ' - ,: ..Spelerpes bilineatus—p, n.^'- 



