ting to be eight inches long (head and body) ; east of the Rockies, and 

 introduced on the West Coast 



Rana catesheiana Shaw Common Bullfrog, Jumbo Frog 



75. Either with a dark patch from the cheek back through the tympanum, or 



with the under parts red, or both 76. 



No dark cheek patch; under parts white or yellow posteriorly (Sometimes 

 the under parts are red as the result of a diseased condition. Frogs hav 

 ing the under parts naturally red are found in the United States only in 

 the Rocky Mountain region and westward.) 81. 



76. Under parts white or greenish; with a dark cheek patch; northern and 



eastern species 77. 



Under parts red or yellow posteriorly; dark cheek patch present or absent; 



western species 78. 



77. Back almost uniformly colored; breast scarcely spotted; Maine to S. C. 



and Arkansas 



Rana sylvatica sylvatica (Le Conte) Eastern Wood Frog 

 Back with a wide, dark, mid-dorsal band and often with a fine, light, mid' 

 dorsal stripe; breast well spotted; Michigan north and west 



Rayia sylvaUca cantahngensis Baird Northern Wood Frog 



78. Length of leg to heel reaching forward to the eye; cheek patch indistinct 



to absent; dorsolateral ridges often absent 87. 



Length of leg to heel reaching forward to the nostril; cheek patch usually 



more distinct; dorsolateral ridges usually present 79. 



79. Under parts yellow posteriorly; Wash, and Idaho 



Rana aurora cascadae Slater Cascade Frog 

 Under parts red posteriorly 80. 



80. Skin of back smooth; West Coast, south to northern California 



Rana aurora aurora (B. ^ G.) Oregon Red-legged Frog 

 (Rana agilis of Cope) 

 Skin of back rough or tubercular; California; introduced into Nevada 

 Rana aurora draytonii (B. 6? G.) California Red-legged Frog 

 8L Back with lengthwise ridges between the dorsolateral ridges; usually with 

 a light line along the upper jaw; back usually with the dark spots about 

 the size of the eyes in two or three rows between the dorsolateral ridges 



82. 



Back smooth between the dorsolateral ridges, or with the dorsolateral 



ridges obscure to absent; color various 84. 



82. Dark spots on back between dorsolateral ridges squarish and closely 



spaced in two lengthwise rows; color brownish; under parts bright yel- 

 low posteriorly; west to Oklahoma 



Rana palustris Le Conte Upland or Pickerel Frog 

 Dark spots on back usually more rounded and about as far apart as one 

 average sized spot; general color usually greenish; under part usually 

 paler 83. 



83. Snout acute; length (head and body) about two and one-half times the 



length of the head to the posterior margin of the tympanum; typically 

 with a distinct, rounded, white spot in the center of the tympanum; 

 southeastern states to Texas 



Rana pipiens sphenocephala (Cope) Southern Leopard Frog 



354 



