FROGS OF COLOMBIA — COCHRAN AND GOIN 187 



its diameter slightly greater than its distance from nostril; palpebral 

 membrane not reticulate; interorbital distance half again as great as 

 width of upper eyelid, which is slightly greater than distance between 

 nostrils. Tympanum very distinct, about three-fifths the diameter 

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

 own diameter. Fingers webbed at base, web reaching base of antepe- 

 nultimate phalanx of third finger, fourth finger considerably longer 

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

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

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

 the base of the antepenultimate phalanx; third and fifth toes sub- 

 equal; disk of fourth toe just covering the tympanic area; a distinct 

 oval inner and a smaller but distinct rounded outer metatarsal 

 tubercle; no tarsal ridge; no dermal appendage on heel. Body not 

 elongate, in postaxillary region a little narrower than greatest width 

 of head; when hind leg is adpressed, heel reaches middle of eye; when 

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

 legs are bent at right angles to body, heels overlap somewhat. No 

 patagium. Skin of upper parts smooth. A well-developed dorsal 

 marsupium present. This is inflated and contains eggs. The opening 

 is a longitudinal slit, 7 millimeters long, that lies 10 millimeters in 

 front of the vent. A rather narrow glandular ridge passes above upper 

 part of tympanum; skin of throat and chest very finely granular, 

 that of belly and lower surface of thigh uniformly granular; a well- 

 developed skinfold across chest; adult female, no vocal sac. Skin of 

 head not co-ossified with skull, roof of skidl strongly exostosed. 



Dimensions.' — Head and body, 59 mm.; head length, 18.7 mm.; 

 head width, 20.3 mm.; femur, 26.4 mm.; tibia, 27.9 mm.; heel-to-toe, 

 40.7 mm.; hand, 17.4 mm. 



Color in alcohol. — Dark lead gray on all dorsal surfaces. Chin and 

 throat gray, belly surface very light gray with thickly scattered 

 flecks of brown. Along the side between axilla and groin and on the 

 anterior face of the thigh neckings of the pale gray ventral color 

 give a somewhat mottled appearance. Similar but less distinct mott- 

 lings occur on the undersurfaces of arms and legs. 



Variation.' — In color and pattern the series is rather uniform. Some 

 individuals are more heavily mottled below and some have more 

 prominent postocular dark stripes, but in general they are much the 

 same. 



Some geographic variation that may be significant is indicated. 

 Preserved specimens from San Pedro in Antioquia are smoother 

 skinned, have more prominent dorsolateral folds, and are more 

 somber in appearance, showing less mottling on the belly and con- 

 cealed portions of the thighs and groin than do the Nariflo and Cauca 



