Vol. XXVI, pp. 53-56 March 22, 1913 



PROCEEDINGS 



OF ["HE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTION OF A NEW SUBSPECIES OF RANA 

 PRETIOS. I FROM N EVAD A . 



BY HELEN B. THOMPSON, 



Mi -i i m of Natural History, University of Michigan. 



During the summer of 11)12 the Walker-Newcomb Expedi- 

 tion to northeastern Nevada collected a scries of frogs which 

 are closely related to Rana pretiosa, but which differ from the 

 typical form in structure and in coloration sufficiently to require 

 subspecific recognition. I am indebted to Dr. Alexander (i. 

 Rut liven, Head Curator of the Museum, for permission to pub- 

 lish this description, and to Dr. Leonhard Stejneger for the loan 

 of specimens of Rana pretiosa from the collection of the ('. S. 

 National Museum. 



Rana pretiosa luteiventris subsp. now 



Diagnosis. — Form as in Rana pretiosa. Head broader than long; 

 tympanum smaller than eye; vomerine teeth in two oblique patches 

 extending behind internal nares. Lateral folds inconspicuous. Heel of 

 extended hind limb reaching between middle of tympanum and end of 

 snout ; small inner metatarsal tubercle, no tubercle at base of fourth toe; 

 palmar tubercle indistinct or lacking. Color above varying from bright 

 to dark yellowish brown on upper surface; hack between lateral folds 

 with few or many irregular dark blotches; under surface anteriorly 

 whitish mottled with jrrey, posteriorly orange yellow. 



Habitat. — Humboldt and Maggie Valleys in Maggie Basin, Eureka 

 and Elko Counties, Nevada. 



Type-specimen. — Museum of Natural History, University of Michigan, 

 Cat. No. 43,037; Anne Creek, Elko Co., Nevada; July 16, L912; Crystal 

 Thompson, collector. 



Description of type-specimen. — Form stout. I lead broader than long; 

 snout rounded; external nares small and round, nearer end of snout 

 than eye; eye small; tympanum small, three-fifths the size of the eye; 

 tongue large and fleshy, strongly notched behind ; vomerine teeth extend- 



11— Proc. Biol. Soc. Wash., Vol. XXVI. 1913. (53) 



