Sierra Madre Yellow-legged Frog, 



Plate LXII. (xf). I, 2. 

 Females. 3, 4. Males. 



Rana boylii muscosa Camp. 



Range: San Gabriel, San 

 Bernardino, and San Jacinto 

 mountains of southern Cali- 

 fornia. 



Habitat: "Occupies the 

 upper Sonoran and Transi- 

 tion life zones. Lives along 

 streams in narrow rock- 

 walled canons." — (Grinnell- 

 Camp, 1917, p. 148). 



Size: Adults, 1 4/5-3 1/4 

 inches. (Males, 45-66 mm. 

 Females, 47-81 mm.). 



General appearance: "Like 

 Rana boylii boylii, but attain- 

 ing much larger size, and 

 (except in young) with no 

 light patch in front of dark 

 areas across upper eyelids. 

 Dorsal ground color usually 

 lighter than in R. b. boylii, 

 light yellow to brown, con- 

 trasting with the darker moss- 

 like patches on the back. 

 Tips of toes more expanded 

 than in boylii." — (Camp, 

 1917, p. 119). 



Structure: Tips of toes more 

 expanded than in R. boylii 

 boylii; dorsolateral fold in- 

 distinct, not pitted anteriorly; 

 tympanum and area sur- 

 rounding it very rough, cover- 

 ed with small tubercles; web 

 of hind foot extending nearly 

 to tips of toes, broader in ex- 

 panse than mR.b. boylii; swell- 

 ing on thumb of male has 

 two lobes, the constriction 

 being diagonal, not transverse. 



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