318 



U.S. NATIONAL MUSEUM BULLETIN 2 88 



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

 separated from eye by a distance equal to three-fifths its own 

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

 of penultimate phalanx, fourth finger considerably longer than second, 

 reaching to middle of disk of third which covers about three-fourths 

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

 Toes more than one-half webbed, the web on fourth toe reaching 

 base of penultimate phalanx, third and fifth toes subequal, disk of 

 fourth toe covering about two-thirds 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 mod- 

 erately elongate, in postaxillary region a little 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 over- 

 lap considerably; when hind legs are bent at right angles to body, 

 heels overlap considerably. No patagium. Skin of upper parts of head, 

 trunk, legs, and feet thickly covered with small, conical, white-tipped 

 warts, with a few less-distinct warts on the loreal region. A rather 

 narrow glandular ridge encircling upper part of tympanum; skin or 

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

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



Figure 38. — Osteocephalus orcesi, CNHM69 710 (same size). See also Plate 38a-c. 



