1HS6.J bZx ICope. 



R. A. aurora Baird & Girard. Bana aurora B. & G., Proc. Ac. Phila., 

 1862, p. 174, and U. S. Explor. Exped., Herp., P- 18, pi. 11, f. 1-6. 

 Washington and Oregon. 



Ran a draytoni Baird & Girard. Bana draytoni B. & G., Proc. Ac 

 Phila., 1862, p. 174 ; Girard, U. S. Explor. Exped., Herp., p. 23, pi 

 11, f. 19-24. Bana lecontei Baird & Girard, Proc. Ac. Phila., 1853, p 

 301 ; Bana nigricans Hallow, Proc. Ac. Phila., 1854, p. 96 ; Boulen 

 ger, Bull. Soc. Zool. Fr., 1880, p. 207 ; Brocchi, Miss. Sc. Mex. Batr. 

 p. 15, pi. iv, f. 3. Bana longipes Hallow, U. S. Explor. Surv., x 

 1859, iv, Zool., p. 20, pi. x, f. 1. Epirhexis longipes Yarrow, Check 

 List and Catal. of Specimens of N. Amer. Rept. Batr., 1883, p. 176, 

 not of Baird and Cope. 

 Pacific, and Western part of Central regions. 



R. d. draytoni Baird & Girard. 

 California. 



R. d. onca Cope, in Yarrow's Rept. Expl. Surv. W. of 100th Mer. Zodl., 

 Vol. v, p. 528, pi. 25, f. 1-3. 

 Utah. 



Rana boylii Baird, Proc. Ac. Phila., 1855, p. 62. 

 California. 



Rana silvatica Lee. Bana sylvatica Lee, Ann. N. Y. Lye, i (1825), 282. 

 Bana pennsylvanica Harlan, Sill. Am. Jour. Sc, x (1825), 58. 

 Eastern region. 



Rana pachydermia Cope, Proc. Ac. Phila., 1883, p. 25. 

 Northern California and Southern Oregon. 



URODELA. 

 Plethodon crassulus Cope, sp. nov. 



This species has a superficial resemblance to the P. oregonensts, but its 

 manifold differences are easily perceived. 



The form is quite robust, and the head is large, its width going into the 

 length to the thighs only five times. The tail is very much compressed 

 from the base, and is also shallow ; its length equals the distance from its 

 base to the gular fold. The legs are robust, but not very long ; when ap- 

 pressed to the side they fail to meet by the length of the posterior foot. 



The tongue is large, filling the floor of the mouth. The vomeropala- 

 tine teeth are in two short series, which converge backwards without 

 coming into contact, from behind the internal edge of the choange. The 

 parasphenoid teeth are in a single, undivided patch, which commences 

 well behind the vomeropalatines. The maxillary and mandibular teeth 

 are minute. 



The head, viewed from above, is oval ; in profile the muzzle is thick 

 and truncate, and projects beyond the mouth. The edge of the lip is 

 slightly angulate below the nares. The eye is rather large, its length 



