107 



CYSTIGNATHUS NIGRITUS.— Leconte. 



Plate XXVI. 



Characters. Head elongated, snout rather pointed, upper lip white; body 

 above speckled with small white granulations; back olive-brown, with a tinge of 

 yellow, and an interrupted black vertebral line; beneath whitish, granulated^ 

 extremities ash coloured above, with several transverse dusky bars or oblong 

 blotches. 



SrNONrMES. Rana nigrita, Leconte, Ann. Lye. Nat. Hist. N. Y., vol. i. p. 282. 

 Rana nigrita, Harlan, Med. and Phys. Res., p. 105. 



Description, The head is elongated, and ash coloured above, with the snout 

 rather pointed. The nostrils are lateral, and nearer the snout than the orbits. 

 The eyes are large and prominent, the pupil black, the iris golden above and 

 grey below. The mouth is rather large, and the palate is armed with two thick 

 groups of minute teeth, placed between the posterior nares and disposed a little 

 "en chevron." The tympanum is dusky and very small. The upper jaw is 

 yellowish-white, which colour is continued below the anterior extremities; above 

 this is an irregular black blotch, beginning near the snout, including the greater 

 part of the eye, and reaching to the shoulder. 



The body is slender, olive brown above, with a tinge of yellow, and an 

 interrupted black vertebral line from the snout to the rump. The abdomen is 

 yellowish-white, and granulated posteriorly. 



The anterior extremities are slender, and coloured above like the back, with 



