162 U.S. NATIONAL MUSEUM BULLETIN 288 



Diagnosis.— A Cryprobatrachus with thick thighs that are faintly- 

 mottled posteriorly. 



This species may be distinguished from C. nicefori by the lack of 

 very distinct crossbands on the thighs and light spots on the back. 

 From C. fuhrmanni it may be distinguished by its smoother skin, by 

 being generally paler, both above and below, by having much less 

 distinct dorsolateral folds, and by having the distance from the anterior 

 corner of the eyelid to the naris about equal the distance between the 

 anterior and posterior corners of the eyelid. 



Description. — MZUM 48530 (holotype), from San Lorenzo, Magda- 

 lena, Colombia. Vomerine teeth in two short, transverse series lying 

 close together on a level with the posterior borders of the small, 

 rounded choanae; tongue half as wide as mouth opening, broadly 

 cordiform, its posterior border very slightly free and very shallowly 

 notched. Snout moderate, broadly triangular when viewed from 

 above, rounded in profile, the snout extending slightly beyond lower 

 jaw; nostrils more lateral than superior, slightly projecting, their 

 distance from end of snout about one-half their distance from eye, 

 separated from each other by an interval equal to about their distance 

 from eye. Can thus rostralis fairly well defined; loreal region slightly 

 concave and somewhat oblique, the upper lip flaring out moderately 

 below it. Eye moderate, not particularly prominent, its diameter 

 one-fourth greater than its distance from nostril; interorbital distance 

 about equal to width of upper eyelid, which is relatively wide and 

 about equal to the distance between nostrils. Tympanum very distinct, 

 about one-fourth the diameter of eye, separated from eye by a distance 

 equal to about one-half its own diameter. Fingers without webs at 

 base, fourth finger considerably longer than second, just reaching to 

 middle of disk of third, which snugly covers the tympanic area; no 

 projecting rudiment of a pollex. Toes slightly more than one-half 

 webbed, the web on fourth toe reaching the base of the penultimate 

 phalanx, third and fifth toes subequal, disk of fourth toe just covering 

 the tympanic area; a distinct oval inner and a smaller but equally 

 distinct rounded outer metatarsal tubercle; no tarsal ridge; no dermal 

 appendage on heel. Body not elongate, in postaxillary region a little 

 narrower than greatest width of head; when hind leg is adpressed, 

 heel reaches beyond tip of snout; when limbs are laid along the side, 

 knee reaches into axilla; when hind legs are bent at right angles to 

 body, heels just touch. No patagium. Skin of upper parts smooth; 

 a rather narrow glandular ridge encircling upper part of tympanum; 

 skin of throat and chest smooth, that of belly and lower femur uni- 

 formly and very finely granular; traces of a skinfold across the chest; 

 no inguinal gland; vocal sac not apparent. Skin of head not co-ossified 

 with skull, roof of skull not exostosed. 



