FROGS OF COLOMBIA — COCHRAN AND GOIN 295 



nostril; palpebral membrane not reticulate; interorbital distance 

 slightly greater than width of upper eyelid, which is about equal the 

 distance between nostrils. Tympanum very distinct, about one-half 

 the diameter of eye, separated from eye by a distance nearly equal to 

 its own diameter. Fingers webbed, the web on the third finger reach- 

 ing the base of penultimate phalanx on both sides, fourth finger only 

 slightly longer than second, just reaching to disk of third which covers 

 half again the tympanic area; no projecting rudiment of a poll ex; no 

 idnar ridge. Toes almost completely webbed, the web on fourth toe 

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

 disk of fourth toe slightly more than covering 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 not elongate, in postaxillary region about equal to the greatest 

 width of head; when hind leg is adpressed, heel reaches tip of snout; 

 when limbs are laid along the side, knee and elbow overlap consider- 

 ably; when hind legs are bent at right angles to body, heels overlap 

 moderately. A well-developed patagium extends from back of upper 

 arm to side of body. Skin of upper parts smooth; a low, inconspicuous 

 fold encircles upper part of tympanum; skin of throat and chest 

 smooth; that of belly and lower surface of thigh uniformly granular; 

 traces of a skinfold across chest; two distinct, rounded glandular 

 areas in the pectoral region; adult female, no vocal sac. Skin of head 

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



Dimensions. — Head and body, 36.8 mm.; head length, 10.7 mm.; 

 head width, 11.7 mm.; femur, 19.6 mm.; tibia, 20.3 mm.; heel-to-toe, 

 28.9 mm.; hand, 6.4 mm. 



Color in alcohol. — Dorsal ground color bluish gray with a superim- 

 posed pattern of silvery white. The silvery white pattern is comprised 

 as follows: a triangular area on top of head with the posterior corners 

 of the triangle each continuous with a broad dorsolateral stripe that 

 passes above eye and tympanum and terminates about the level of 

 the sacral hump; a heart-shaped spot on dorsum extending from 

 region of the sacral hump to above the vent; dorsum between the 

 dorsolateral stripes thickly spotted with tiny white spots; a horizontal 

 white streak occurring on each upper jaw and extending from eye to 

 edge of lip. On the anterior limbs there are several small white spots 

 with a larger one just proximal to the wrist. The thighs of hind limbs 

 are without pattern, as is characteristic of frogs of this group; but 

 there is a small white spot on each knee, and on the dorsal surface of 

 each shank is an elongate white daub with a distinct notch on the 

 inner side of each daub, and in each notch there is a small white spot. 

 The lateral surface of the left foot is margined in white. All ventral 

 surfaces are immaculate. 



