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: 
I. 
2. 
If, 
2. 
13. 
14: 
15. 
16. 
E7- 
18, 
Body without scales or plates.— BATRACHIA. 2. 
Body covered with scales or plates.— REPTILIA. 35. 
Adult with heavy, external gills. Over 1% feet in length.— 
Necturus maculatus—p. 106. 
Adult without external gills. 3. 
Adults with tails developed.— URODELA. 4. 
Adults tailless, hind legs longer than anterior pair and fitted for jump- 
ing.— SALIENTIA. 24. 
Length over 1% feet. Body large and heavy.— 
Cryptobranchus alleganiensis—p. 107. 
Length under 1% feet. Body small and slender. 5. 
Whole of body bright vermilion red. 6. 
Body not bright vermilion red. 7. 
Length 3% in. Body slender. A row of large spots along the sides.— 
Diemyctylus viridescens miniatus—p. 116. 
Length 6in. Body heavy, sprinkled with small, black dots.— 
Spelerpes ruber ruber —p. 114. 
Toes 4-4. Brown, whitish below.— Hemidactylum scutatum—p. 110. 
Toes 4-5. 8. 
Costal grooves under 13 in number. 9. 
Costal grooves over 13 in number. 14. 
Length under 4 in.— Amblystoma opacum—p. 107. 
Length over 4 in. Io. 
Body with yellow spots or blotches. 11. 
No yellowon body. With bluish spots or uniformly blackish above. 13. 
Length under 6in. Yellow spots rounded.— 
Amblystoma punctatum—p. 108. 
Length over 6in. Yellow in blotches of irregular contour. 12. 
Tail but little longer than head and body.— 
Amblystoma tigrinum—p. 108. 
Tail much longer than head and body.—Amb6lystoma xiphias—p. 109. 
No spots ventrally.— 
Amblystoma jeffersonianum jeffersonianum—p. 109. 
Whitish spots below.—A mblystoma jeffersonianum platineum—p. 110. 
Costal grooves numerous, 16 or over in number. I5. 
Costal grooves 13-14 in number. 17. 
Without red dorsal band. 16. 
With red dorsal line.— Plethodon cinereus erythronotus—p. 111. 
Small, 3% in. in length.— Plethodon cinereus cinereus—p. I11.. 
Large, 6 in. in length.— Gyrinophilus porphyriticus—p. 112. 
Length under 3% in. 18. 
Length over 3% in. 19. 
A light bar from eye to angle of mouth; white below.— 
Desmognathus ochrophaea—p. 114. 
No light bar; yellow below.— Spelerpes bilineatus—p. 113- 
