FROGS OF COLOMBIA — COCHRAN AND GOLN 265 



tance from nostril; palpebral membrane not reticulate; interorbital 

 distance half again as great as the width of upper eyelid, which is 

 about equal the distance between nostrils. Tympanum very in- 

 distinct, about one-fourth the diameter of eye, separated from eye by 

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

 the web reaching the proximal end of the antepenultimate phalanx 

 of third finger and the base of the penultimate of the second and 

 fourth fingers; fourth considerably longer than second, just reaching 

 to disk of third which just covers the tympanic area; no projecting 

 rudiment of a pollex; no ulnar ridge. Toes slightly more than one-half 

 webbed, the web on fourth toe extending as a margin to the base 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 somewhat indistinct 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 anterior margin of 

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

 considerably; 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. Skin of upper parts smooth; 

 a rather narrow glandular ridge encircling upper part of tympanum; 

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

 thigh uniformly and very finely granular; traces of a skinfold across 

 chest; adult male, vocal sac median, subgular. Skin of head not 

 co-ossified with skull, roof of skull not exostosed. 



Dimensions. — Head and body, 25.5 mm.; head length, 8.3 mm.; 

 head width, 8.3 mm.; femur, 11.2 mm.; tibia, 13.7 mm.; heel-to-toe, 

 18 mm.; hand, 8.5 mm. 



Color in alcohol. — A pale brown frog with a blotch of darker brown 

 on the back. This blotch is rather oblong, with one end between the 

 eyes and the other end anterior to the sacral hump. A deep notch on 

 the posterior end gives the blotch a V-shaped appearance. Faint 

 traces of crossbands are present on the shanks. The thighs are lightly 

 pigmented but without pattern. There is no evidence of the little 

 horizontal white bar above the vent and across the heels that is so 

 characteristic of H. minuta. The ventral surfaces are immaculate and 

 a pale dirty brown. 



Remarks.- — In preservative this species looks superficially rather 

 similar to H. minuta but the absence of a superanal white line and 

 distinct pattern on the back will distinguish it from that species on 

 close inspection. When a pattern is present on the back of columbiana 

 it is generally asymmetrical. In some specimens no pattern is discerni- 

 ble on the back but in others dark chocolate brown blotches often can 



