NATURAL SCIENCES OF PniLADELPHIA. 215 



Description of several new North American Reptiles. 



BY EDWARD HALLOWELL, M. D. 



Fam. SCINCIDJE. 



Sauriens lbpidosaures, D. & B. 



Gen. PLESTIODON, D. k B. 



Plestiodon guttclatus, nob. 



Syn. Lam. prosaurus ffullulatus, Ilallowell. Sitgreaves' Report of Exploratior- 

 of the river Zuni. 



We have in the collection of the Academy three specimens of this species, 

 the original one from New Mexico, and two from Kansas, all presented by Dr. 

 AVilliam A. Hammond, U. S. A., to whom the Academy is greatly indebted for 

 several valuable collections, more especially illustrating the Zoology of Kansas 

 and Nebraska, and that of the region of the Rocky Mountains. The original 

 specimen from New Mexico was in such a condition as to render it extremely 

 difficult to determine its true characters ; the two from Kansas, however, are in 

 fine preservation, and '>nables us to present a more accurate notice of it. 



Sp. Char. Color black above, scales shining ; a series of white spots along 

 the upper and lower jaw, also upon the external border of the supraocular plates : 

 32 rows of scales. Total length 3 inches 4^ lines ; length of tail 1 inch d lines. 



For detailed description see Sitgreaves' Report. 



Habitat. Kansas and New Mexico. 



Plestiodon multivirgatum, nob. 



;S^. Char. A small more or less quadrangular plate immediate]}'' above the 

 freno-nasal ; auricular openings circular, with several scales upon the anterior 

 margin ; back with four well-defined blackvittaj, (the two median ones broader,) 

 occupying the half, or nearly so, of the adjacent rows of scales ; besides these, 

 four other narrower black lines, each occupying the angle of a single row ot 

 scales ; the interspaces between the dark colored vittas white, with a bluish 

 tinge ; upper and lower lips white, abdomen bluish, tail white, with a yellow 

 tinge above ; 24 rows of scales. 



Dimensions. Length of head 4 lines ; greatest breadth 3| ; of head and body 

 to vent 2 inch. 3 lines ; of tail 2 inch. 8J lines ; of arm 2 lines ; of forearm 2 : 

 of hand to extremity of longest finger 2\ ; of thigh 2 lines ; of leg 2 lines ; of 

 foot to extremity of longest toe 3 lines. 



Habitat. Posa Creek, 460 miles west of Fort Riley, Kansas. 



One specimen presented by Dr. Hammond, U. S. A. 



Gen. Remarks. In Plestiodon obsoletum there are 28 rows of scales. 



URODELES, Dum. 



Urodeles trematoderes, D. k B. 



Gen. AMBYSTOMA, Tschudi. 



AilBYSTOMA MAC0LATUM, nob. 



Sp. Char. Head large, body stout, tail ensiform, fingers and toes depressed, 

 posterior nares of moderate size, teeth arched, in four patches, the two middle 

 convex anteriorly, nearly in contact ; color brownish above ; tail maculated 

 with black ; under parts yellow. Total length Y^ inches ; tail 3.| inches. 



Habitat. New Mexico. One specimen presented by Dr. McClellan. 



Ambystoma bicolor, nob. 



Sp. Char. Head large ; feet very moderately depressed ; tail rather thick at 

 base, rounded above, moderately compressed ; posterior nares small ; teeth in 



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