FROGS OF COLOMBIA — COCHRAN AND GOIN 219 



but unnotched. Snout moderate, rounded when viewed from above, 

 slightly sloping in profile, the upper jaw hardly extending beyond 

 lower; nostrils more lateral than superior and more anterior than 

 lateral, not projecting, their distance from end of snout about one- 

 half that from eye, separated from each other by an interval equal to 

 about their distance from eye. Canthus rostralis slightly defined; 

 loreal region somewhat concave and oblique, the upper lip flaring out 

 slightly below it. Eye not large, but prominent, its diameter equal to 

 its distance from nostril; palpebral membrane not reticulate; inter- 

 orbital distance half again the width of upper eyelid, which is about 

 equal the distance between nostrils. Tympanum distinct but not very 

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

 by a distance nearly equal to its own diameter. Fingers webbed at base, 

 fourth finger longer than second, just reaching to disk of third which 

 about covers the tympanic area; no projecting rudiment of a pollex; 

 a distinct 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 covering about two-thirds the 

 tympanic area; a distinct oval inner and a smaller but equally dis- 

 tinct rounded outer metatarsal tubercle; a distinct tarsal ridge; a 

 small but distinct triangular dermal appendage on heel. Body rather 

 elongate, in postaxillary region a little narrower than greatest width 

 of head; when hind leg is adpressed, heel reaches almost to nostril; 

 when limbs are laid along the side, knee and elbow overlap slightly; 

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

 A small patagium extends from the back of the upper arm to the side 

 of the body. A transverse dermal fold above vent. Skin of upper 

 parts smooth, skin of throat and chest smooth, that of belly and 

 lower surface of thigh uniformly and very finely granular; no apparent 

 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, 40.6 mm.; head length, 13.0 mm.; 

 head width, 12.5 mm.; femur, 19.7 mm.; tibia, 21.2 mm.; heel-to-toe, 

 28.5 mm.; hand, 13.4 mm. 



Color in alcohol. — Practically white with a pattern of black pigment 

 as follows: scattered, inconspicuous, tiny black spots on dorsum and 

 top of head; each naris margined in black; a very narrow black line 

 margins the upper lip back to a level between the naris and eye on 

 each side; the transverse fold above the vent, tarsal ridges, and dermal 

 appendages on heels are milky white above and black below; the ulnar 

 ridges are milky white with interrupted black lines. 



Remarks. — Although H. albomarginata has been previously recorded 

 from Colombia (Cochran, 1955 p. 168), Fouquette (1961 p. 600) 

 pointed out that the specimens on which the Colombian records are 



