234 



U.S. NATIONAL MUSEUM BULLETIN 2 88 



between nostrils. Tympanum very distinct, about one-half the di- 

 ameter of eye, separated from eye by a distance equal to one-half its 

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

 base of penultimate phalanx, fourth finger an entire disk longer than 

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

 the tympanic area; projecting rudiment of a pollex slightly developed; 

 a low ulnar ridge. Toes nearly completely webbed, the web on fourth 

 toe reaching the middle of the penultimate phalanx, third and fifth 

 toes subequal, disk of fourth toe just snugly covering the tympanic 

 area; a distinct oval inner and a smaller, very indistinct rounded outer 

 metatarsal tubercle; a low but discernible tarsal ridge; a short but 

 distinct triangular dermal appendage on heel. Body moderately elon- 

 gate, in postaxillary region about two-thirds the 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 overlap; when 

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

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



Figure 22. — Hyla guibei, holotype, CNHM 54773 (same size). 



