320 U.S. NATIONAL MUSEUM BULLETIN 288 



0. taurinus may be distinguished from 0. leprieuri by the presence 

 of numerous, small spines on the back, and from 0. orcesi by the 

 heavily exostosed skull. 



Description. — CNHM 81332, from Meta, Serrania de La Macarena. 

 Vomerine teeth in two heavy /~~\ series, lying between the large 

 oblong choanae; tongue one-half as wide as mouth opening, half 

 again as long as wide, somewhat pear-shaped, its posterior border 

 fused and unnotched. Snout moderate, U-shaped when viewed from 

 above, truncate in profile, the upper jaw extending slightly beyond 

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

 distance from end of snout about one-third that from eye, separated 

 from each other by an interval equal to about two-thirds then- distance 

 from eye. Can thus rostralis sharply defined; loreal region concave 

 but nearly vertical, the upper lip flaring out but slightly below it. 

 Eye large, not particularly prominent, its diameter equal to its 

 distance from nostril; palpebral membrane not reticulate; interorbital 

 distance slightly greater than width of upper eyelid, which is rela- 

 tively wide and slightly greater than distance between nostrils. 

 Tympanum very distinct, about three-fifths the diameter of eye, 

 separated from eye by a distance nearly equal to one-fourth its own 

 diameter. Fingers webbed at base, web on third finger reaching 

 middle of antepenultimate phalanx, fourth finger considerably longer 

 than second, just reaching to middle of disk of third which just covers 

 the tympanic area; no projecting rudiment of a pollex; no ulnar ridge. 

 Toes more than three-fourths webbed, the web on fourth toe reaching 

 the middle of penultimate phalanx, third and fifth toes subequal, 

 disk of fourth toe nearly 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 rather 

 elongate, in postaxillary region a little narrower than greatest width 

 of head; when hind leg is adpressed, heel reaches well beyond 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 greatly. No patagium. Skin of upper parts glandular, with 

 numerous, small, rounded, wart-like tubercles. Two very prominent, 

 longitudinal ridges on top of head between the eyes; a few less-well- 

 developed tubercles on upper surfaces of arm and shank; a pronounced, 

 heavy glandular ridge passing above tympanum; skin of throat and 

 chest smooth, that of belly and lower surface of thigh uniformly 

 granular; no traces of a skinfold across chest; adult male, vocal 

 sacs paired, one behind each angle of jaw. Skin of head not co-ossified 

 with skull, roof of skull heavily exostosed, with a pair of well-devel- 

 oped longitudinal ridges. 



