FROGS OF COLOMBIA — COCHRAN AND GOIN 257 



slightly projecting, their distance from end of snout about one-half 

 that from eye. Canthus rostralis very well defined; loreal region very 

 slightly concave and nearly vertical, the upper lip flaring out hardly 

 at all below it. Eye moderate, not prominent, its diameter equal to 

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

 orbital distance one-third again the width of upper eyelid, which is 

 slightly less than distance between nostrils. Tympanum very distinct, 

 about three-fifths the diameter of eye, separated from eye by a dis- 

 tance equal to two-thirds its own diameter. Fingers webbed at base, 

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

 covers about three-fourths the tympanic area; no projecting rudiment 

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

 the web on fourth toe reaching nearly to tip of antepenultimate 

 phalanx, third and fifth toes subequal, disk of fourth toe covering 

 about three-fourths 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 just a little narrower than greatest width of head; 

 when hind leg is adpressed, heel reaches to nostril; when limbs are 

 laid along the side, knee and elbow meet snugly; when hind legs are 

 bent at right angles to body, heels overlap appreciably. A weak 

 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 

 passing above tympanum; skin of throat finely granular, that of chest, 

 belly, and lower surface of thigh uniformly and more coarsely granular; 

 a rather distinct 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, 39.5 mm.; head length, 12.7 mm.; 

 head width, 13 mm.; femur, 19.2 mm.; tibia, 21.5 mm.; heel-to-toe, 

 29.9 mm.; hand, 10.8 mm. 



Color in alcohol. — Top of head and dorsum uniform bluish-gray, 

 ventral surfaces a dark cadaverish gray. The axillae, groins, anterior 

 and posterior faces of thighs, and undersurfaces of shanks and feet 

 very dark gray, nearly black, with a distinct pattern of vermicidations. 

 The tops of the arms and hands and the shanks and feet are bluish- 

 gray, as the dorsum, but on top of the thigh the blue-gray of the 

 dorsum is restricted to a rather narrow stripe of ground color pigment 

 that separates the pattern of vermiculations on the front of the thigh 

 from that on the back. 



Remarks. — There seems to be no doubt that the population of 

 Hyla labialis in the northern portion of the Sierra Oriental of the Andes 

 in Colombia and Venezuela is sharply different from the population 

 of typical labialis around Bogota. The only question is whether the 

 specimens we examined from Boyaca should be listed as typical 



