74 TJ. S. NATIONAL MUSEUM BULLETIN 206 



1843. Hypsiboas langsdorffii Fitzinger, p. 30. 

 1867. Osteocephalus langsdorffii Cope, p. 200. 



Description. — Adult male, USNM 121337 Pod, Sao Paulo. Vomer- 

 ine teeth in two very heavy, narrowly separated, short, transverse 

 groups between the choanae and extending to behind their posterior 

 borders; tongue two-thirds the width of mouth-opening, nearly 

 round except for its slightly concave posterior rim, and nearly entirely 

 attached ; head v/ith a pair of ridges from inner orbital border converg- 

 ing slightly towards occiput, on each side of which is a low transverse 

 ridge marking the end of the skull; snout moderate in length, rounded 

 when viewed from above, rounded and sloping backwards from edge 

 of upper lip when seen in profile, the upper jaw slightly extending 

 beyond the lower; nostrils dorsolateral, moderately projecting, their 

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

 from each other by an interval slight!}^ smaller than their distance 

 from eye. Canthus rostralis distinct but bluntly rounded, the 

 loreal region concave, the upper lip flaring conspicuously outward 

 below it. Eye large, very prominent, its diameter equal to its dis- 

 tance from nostril; interorbital diameter slightly greater than that 

 of upper eyelid, 1% times the distance between nostrils. Tympanum 

 very distinct, moderate, about one-half the eye diameter, separated 

 from eye by an interval equal to half its own diameter. Fingers 

 one-half webbed, fourth much longer than second, reaching to center 

 of disk of third, which covers the tympanum, a pronounced knob on 

 inside of first finger; a scalloped glandular fold along outside of fourth 

 finger extending to elbow; toes more than three-fourths webbed, 

 third and fifth subequal, disk of fourth a little smaller than tympanum; 

 a large oval inner and a very minute outer metatarsal tubercle ; a few 

 weak glandules marking the position of the inner tarsal ridge; a very 

 heavy serrate outer tarsal ridge ending on heel. Body rather elongate, 

 in postaxillary region narrower than greatest width of head; when 

 hind leg is adpressed, heel reaches tip of snout; when limbs are laid 

 along the sides, knee and elbow overlap; when hind legs are bent at 

 right angles to bod}'", heels considerably overlap. Skin of upper parts 

 glandular, with many small and a few larger tubercles, the latter 

 especially evident on sacrum and tibia; a heavy glandular ridge from 

 eye to above and behind tympanum; a patch of tubercles behind anus, 

 followed by a pair of heavy transverse postanal ridges of glandular 

 skin forming "flaps," with a medium depression between them; 

 throat and chest minutely granular, belly and lower thighs heavUy 

 granular; a transverse skinfold across throat marking presence of 

 internal median vocal sac; no skinfold across chest apparent. The 

 skin on top of the head is not ossified with the skull. 



