192 U. S. NATIONAL MUSEUM BULLETIN 206 



about three-fourths as wide as mouth-opening, very broadly cordiform 

 and deeply notched on its free posterior border; snout very short but 

 with a median tubercle which gives it a sharp point when viewed from 

 above, rather truncate in profile, the upper jaw projecting only 

 slightly beyond lower; nostrils superolateral, scarcely projecting, 

 almost at the tip of the snout, appearing very close together but in 

 reality separated from each other by an interval equal to nearly one- 

 half their distance from eye. Canthus ros trails well defined; loreal 

 region flat, set off from upper lip by a distinct shallow groove. Eye 

 rather large, prominent, its diameter equal to its distance from nostril; 

 interorbital diameter almost twice that of upper eyelid, which is very 

 narrow, and more than twice that between the nostrils. Tympanum 

 not very distinct, covered with skin like the surrounding area, about 

 one-half the diameter of eye, separated from eye by an interval equal 

 to its own diameter. Fingers webbed only at the base, fourth extend- 

 ing to base of disk of third which covers the tympanic area, second 

 extremely short, only slightly longer than first; no projecting rudiment 

 of poUex; toes webbed only at the base, third slightly shorter than 

 fifth, disk of fourth toe nearly covering tympanic area; a distinct, 

 projecting inner but no outer metatarsal tubercle; apparently no inner 

 or outer tarsal ridge; no dermal appendage on heel; body not elongate, 

 in the postaxillary region about equal to greatest diameter of head; 

 when hind leg is adpressed, heel reaches to posterior corner of eye; 

 when limbs are laid along the sides, knee and elbow fail to meet; when 

 hind legs are bent at right angles to body, heels considerably overlap. 

 Skin of upper parts quite smooth except for some indistinct tubercles 

 on snout; a pronounced broad glandular ridge extending from eye over 

 upper border of tympanum and partly obscuring the latter; skin of 

 throat and chest smooth, of belly faintly granular, of thighs rather 

 coarsely granular; no apparent skinfold across the chest, A prominent 

 external median vocal sac. 



Dimensions.' — Head and body 32.5 mm.; head length 11 mm., 

 width 11 mm.; femur 12.5 mm.; tibia 15.5 mm.; foot 13.5 mm.; 

 hand 8.5 mm. 



Mathematical analysis (in percentage of the total length) : 



