312 U.S. NATIONAL MUSEUM BULLETIN 2 88 



dorsal surfaces, and the glandular, dorsolateral folds are nearly black 

 in preservative. 



We do not believe that this species is closely related to any known 

 frog. The black, glandular, dorsolateral folds over the shoulders set 

 it off at once from all other tree frogs. 



Description oj holotype. — Vomerine teeth in a single, continuous 

 series arranged in a curving row with the convex side anterior and lying 

 between the very large, nearly rectangular choanae; tongue two-thirds 

 as wide as mouth opening, broadly rounded, its posterior border fused 

 and distinctly but shallowly notched. Snout moderate, slightly tri- 

 angular when viewed from above, nearly truncate in profile, the upper 

 jaw extending a little 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 their distance from eye. Can thus rostralis strongly denned ; 

 loreal region concave and oblique, the upper lip flaring out below it. 

 Eye large, prominent, its diameter nearly equal to its distance from 

 tip of snout; palpebral membrane not reticulate; interorbital distance 

 slightly less than width of upper eyelid, which is relatively wide and 

 slightly greater than distance between nostrils. Tympanum very 

 distinct, about three-fifths the diameter of eye, separated from eye 

 by a distance equal to about two-thirds its own diameter. Fingers with 

 just a trace of web at base, fourth considerably longer than second, 

 just reaching to disk of third which covers about one-half the tympanic 

 area; no projecting rudiment of a pollex; no ulnar ridge. Toes almost 

 completely webbed, the web on fourth toe reaching middle of penulti- 

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

 about one-third the tympanic area; an indistinct oval inner and a 

 smaller and equally indistinct rounded outer metatarsal tubercle; no 

 tarsal ridge; no dermal appendage on heel. Body somewhat elongate, 

 in postaxillary region distinctly 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 and elbow considerably overlap; 

 when hind legs are bent at right angles to body, heels meet snugly. 

 No patagium. Skin of upper parts smooth; a glandular fold passes 

 above the tympanum and then widens and continues posteriorly to 

 about the level of the adpressed elbows. Skin of throat and chest 

 smooth, that of belly and lower surface of thigh uniformly and dis- 

 tinctly granular; no traces of a skinfold across chest; adult female, no 

 vocal sac. Skin of head not co-ossified with skull, roof of skull not 

 exostosed. 



Dimensions. — Head and body, 42.5 mm.; head length, 17.2 mm.; 

 head width, 14.7 mm.; femur, 21.6 mm.; tibia, 21.3 mm.; heel-to-toe, 

 28.8 mm.; hand, 11.2 mm. 



