100 BULLETIN 34, UNITED STATES NATIONAL MUSEUM. 



CHONDKOTUS CTNGULATUS Cope.^ 



Amilystoma cingulatum Cope, Proc. Ac. Pbila., 1867, p. 205; StraucL, Salam., p. 65; 

 Boulenger, Cat. Batr. Grad. Brlf,. Mas., ed. ii, 1882, p. 50. 



This species approaches the C. microstonms in general, but may be 

 readily known by its more elongate-ovoid head, with long muzzle, more 

 slender form of body, and peculiar coloratiou. 



Mucous crypts and pores are not much developed in this animal; a 

 few only of the latter extend along the superciliary region. The costal 

 folds are fourteea, and are visible across the abdomen. 



The head is elongate, convex both transversely and longitudinally ; 

 the upper face of the muzzle is narrowed, and projects beyond the 

 mandible. The width at the jaws enters the length to the groin G^ 

 times, and If to the edge of the gular fold. The external nares are 

 quite close together, nearer than the long diameter of the eye, and 

 nearly 1.5 this diameter in advance of the eye. The anterior angles of 

 the latter are 2.33 diameters apart. The folds on the side of the head 

 and neck are as in other species. The distance between the inner nares 

 is 1.66 times the distance between the external. 



The tongue is oval, quite elongate, but not filling the space between 

 the rami of the mandible ; its median groove strongly marked. The 

 palatine teeth are in a single row, slightly convex forwards, entirely 

 between the inner nares, their posterior margins of the ends of the 

 series and nares corresponding. The gape of the mouth is short, but 

 longer than in (7. micro stomus ) its external canthus falls anterior to 

 the posterior canthus of the eye, while the anterior canthus of the same 

 measures the posterior third of the gape, commencing at the middle of 

 the premaxillary region. 



Costal grooves fourteen; a median dorsal groove strongly marked. 

 An unusually strong fold across between angles of mandible, which 

 sends a branch to the orbit ; gular fold continued on neck, sending 

 a parotoid groove forwards. Length to gular fold 3.75 in length to 

 groin. 



Length of tail nearly equal from basis of same to the mental cross- 

 fold. It is of rather uniform depth, much comi)ressed, keeled above 

 and for its distal half below. General form of the body slender and 

 compressed, elevated at the scapular and pelvic regions. 



Limbs stout; the fingers slender, but not very elongate. Appressed 

 to the sides they fail of meeting by the length of the sole and longest 

 toe; length from tip to tip when outstretched, .06 length to groin. 

 Length of lower leg and foot, scarcely .8 from muzzle to gular fold. No 

 visible plantar tubercles. Fourth toe distinctly longer than third : then 

 2, 4, 1. Fingers 3, 2, 4, 1. 



Color in alcohol black, the under surfaces thickly speckled with gray. 

 A vertical narrow gray line passes between every pair of costal folds 

 and meets its fellow on the dorsal line or bifurcates to meet a similar 

 bifurcation in like manner, embracing ar^ a;. These narrow an null ex- 



* Text, fig. 117. 



