152 U.S. NATIONAL MUSEUM BULLETIN 2 88 



ciliary process in adults about four millimeters long instead of about 

 2 millimeters long and by having the tympanum separated from the 

 eye by its height (long diameter) rather than by its width. 



Description. — BM 1910.7.11.71, from Rio San Juan, Choc6, 

 Colombia. Vomerine teeth in a pronounced V-shaped structure, 

 anterior teeth in both series enlarged in a definite patch, palatine 

 teeth in two well-developed series nearly in contact medially and 

 passing laterally nearly to the maxillary; each mandible serrate along 

 its entire length with fine, saw-toothed odontoids, with a much 

 enlarged odontoid at the tip of each ramus. No parasphenoid teeth. 

 Moderate-sized, rounded choanae lie in the triangle between the 

 vomerine and palatine teeth. Tongue about half as wide as mouth 

 opening, pear-shaped, its posterior border not free and not notched. 

 Snout arrow-head shaped, terminating in a 4-millimeter proboscis, 

 fleshy, rather flat and pointed in profile, the upper jaw extending 

 two millimeters (exclusive of proboscis) beyond lower; nostrils more 

 superior than lateral, not projecting, their distance from end of snout 

 about equal to that from eye, separated from each other by an interval 

 equal to about one-half their distance from eye. Canthus rostralis 

 sharply defined but low; loreal region very slightly concave and 

 very oblique, the upper lip flaring out strongly below it. Eye small, 

 not prominent, its diameter equal to its distance from nostril; inter- 

 orbital distance more than twice the width of upper eyelid (exclusive 

 of superciliary appendage), which is slightly greater than distance 

 between nostrils. Upper eyelid with a fleshy superciliary appendage 

 four millimeters long. Palpebral membrane not reticulate. Tympanum 

 very distinct, twice as high as wide, its long diameter about equal to 

 diameter of eye, separated from eye by a distance nearly equal to 

 its long diameter. Fingers with a trace of web at base, fourth finger 

 considerably longer than second, reaching to disk of third, which is 

 not so wide as the narrow width of the tympanum; no projecting 

 rudiment of a pollex; ulnar ridge well developed. Toes about one-fourth 

 webbed, the web on fourth toe reaching the middle of the preante- 

 penultimate phalanx, third and fifth toes subequal, disk of fourth 

 toe covering an area about one-half the diameter of disk of third 

 finger; a distinct oval inner and a smaller but equally distinct rounded 

 outer metatarsal tubercle; a well-developed tarsal ridge; a dermal 

 appendage on heel. Body not elongate, in postaxillary region much 

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

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

 elbow overlap considerably; when hind legs are bent at right angles 

 to body, heels overlap considerably. No patagium. Skin of upper 

 parts very finely granular, but the projecting neural spines of the 

 dorsal vertebrae give the appearance of a median row of well- 



