AMPHIBIANS. 23 



C-. Color brown with two irreiiiilar rows of ob- 

 long sqnare blotches of dark l)i'0wn on the 

 back, tlie spots without edgings of lighter 

 color Rana jmlustrif<, p. 51. 



c\ Lateral folds conspicuous. ('(>h)r brownish 

 green with small dark spots. Legs spotted 

 or barred with dark. Web broad leaving 



last two joints of fourth toe free 



Rana rhunitan^'i, p. 53. 



c^. Lateral folds present. Ground color variable. 

 Arms and legs barred. A l)hick ]>atch in 

 ear region. Length of hind limb to heel 

 equals distance from anus to some i)oint in 

 front of eye. . . .Rami cantahrigeiisis^ p. 55. 



c\ Xo lateral folds. Color light olive brown 

 Avith blotches of darker color. Legs spotted 

 or branded Rami scptentriomiUs, p. 57. 



c^. No lateral folds. Color greenish brown with 

 darker spots. Fold of skin from eye to arm 

 curving behind ear. Hind feet webbed, 



leaving last joint of fourth toe free 



Rana catrsheami, p. 59. 



NECTURUS MACULOSUS Kafiiiesque. 



MUD PUPPY. 



(PI- I.) 



Description: Body elongate, thick and cylindrical. Head broad, 

 flat and depressed. Muzzle rounded; mouth large, upper lip over- 

 hanging lower. Eyes small, situated near fi'ont of head; nostrils at 

 end of snout. Three bushv external gills on each side of neck. 

 Gular fold prominent, fourteen costal furrows and a dorsal groove. 

 Limbs small but well developed, digits four in number. Tail greatly 

 compressed. Skin very smooth and slimy. Two series of teeth in 

 almost parallel rows. Premaxillary series short, forming an angle 

 anteriorly. Yomero-palatine series longer, extending from the angle 

 of the premaxillaries to the angle of the jaw. 



Ground color varies from dark to ashy brown above, paler below. 

 Upper surface usually mottled with darker color and with small 

 light spots. Gills bright red. In young specimens a dark lateral 

 band is sometimes found. 



