AMPHIBIANS 183 



70 mm. : northern North America from the northernmost tier of States 

 to Alaska and Hudson Bay; habits similar to those of R. sylvatica. 



R. septentrionalis Baird. Mink frog. Body small, rather stout, 

 light olive in color with mottlings of darker; legs blotched or banded; 

 belly light yellow; length 56 mm.; hind leg 97 mm.: Canada and the 

 northernmost tier of States; aquatic, occurring in streams and not in 

 ponds or lakes. 



R. virgatipes Cope. Body small, with short legs and large ear and 

 eye; color brown, with 4 narrow longitudinal stripes; throat yellow; 

 sides yellowish brown, with large spots ; belly white, spotted with brown ; 

 length 55 mm.: in pine barrens. New Jersey to North Carolina. 



R. grylio Stejneger. Body large, green in color in front and olive 

 behind, with many irregular black spots; beneath hght, unspotted 

 except posteriorly; length 125 mm.; tympanum large: southern Missis- 

 sippi to Florida. 



R. aurora B. & G. Body brown, yellowish or olive in color, often 

 with numerous small darker spots; sides and hind legs reddish orange; 

 belly light, mottled; skin very smooth; length 75 mm.; hind leg 125 

 mm.: Pacific slope from California to Vancouver Island; common 

 towards the north. 



R. draytoni B. & G. Body large, stout, with tuberculated skin and 

 reddish brown in color, with or without darker spots; sides of body 

 and under surface of legs red; belly white, spotted or marbled with 

 brown; length 80 mm.; hind legs 140 mm. : Pacific slope from Oregon to 

 Lower California; common; aquatic. 



R. onca Cope. Body rather small, green or brownish in color, with 

 several irregular rows of dark spots on the back and sides; belly white; 

 length 60 mm.; legs short; skin smooth: Utah and Nevada. 



R. hoyli B. & G. Body small, with a warty skin and very long legs; 

 color brown, olive or red, with obscure round brown spots; beneath 

 white anteriorly, yellow posteriorly ; dorso-lateral ridges broad and incon- 

 spicuous; length 45 mm.; hind leg 75 mm.: California and Oregon; 

 terrestrial. 



Subspecies of R. hoyli 



B. h. hoyli Baird. A light patch on the forehead: southwestern 

 Oregon and CaHfornia. 



R. b. mucosa Camp. Size large ; ground color yellow or Hght brown ; 

 no Hght patch on the forehead : in the mountains of southern California. 



R. h. sierrce Camp. No light patch on the head; head narrow; hind 

 leg short : southern Sierra Nevadas. 



