244 U.S. NATIONAL MUSEUM BULLETIN 2 88 



half its own diameter. Fingers with just a hint of web at base, fourth 

 finger just slightly longer than second, not reaching to disk of third 

 which covers about one-third the tympanic area; no projecting rudi- 

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

 webbed, the web on fourth toe reaching the distal end of the ante- 

 penultimate phalanx, third and fifth toes subequal, disk of fourth 

 toe covering about one-third the tympanic area; a distinct oval inner 

 and a smaller rounded outer metatarsal tubercle; no tarsal ridge; 

 no dermal appendage on heel. Body moderately elongate, in post- 

 axillary region a little narrower than greatest width of head; when 

 hind leg is adpressed, heel reaches tip of snout; when limbs are laid 

 along the side, knee and elbow barely overlap; when hind legs are 

 bent at right angles to body, heels overlap greatly. No patagium. 

 Skin of upper parts very finely granular on top of head and snout and 

 in the region behind the tympanum and above the shoulders but 

 otherwise the dorsal surfaces are rather smooth; a rather narrow 

 inconspicuous glandular ridge encircling upper part of tympanum; 

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

 thigh uniformly and finely granular; well-developed traces of a 

 skinfold across chest; adult male, vocal sac not expanded. Skin of 

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



Dimensions. — Head and body, 36.5 mm.; head length, 14.5 mm.; 

 head width, 12.5 mm.; femur, 17.2 mm.; tibia, 21.2 mm.; heel-to-toe, 

 27.2 mm.; hand, 10.6 mm. 



Color in alcohol. — A medium brown frog with mottlings of dark 

 brown. The most conspicuous of the darker brown dorsal markings 

 are as follows: an interocular triangle with its apex directed posteri- 

 orly; a band on each side that originates behind the eye, passes above 

 the tympanum, and then fades out just posterior to the suprascapular 

 region; a small L-shaped blotch in the middle of the back; a transverse 

 bar at the level of the sacral hump; and two little longitudinal bars 

 between the sacral hump and the vent. There are several broad 

 dark bands across the thighs and shanks, and these bands continue 

 on to the posterior surfaces of the thighs. Most of the rest of the 

 pattern is simply made up of tiny flecks of pigment scattered over 

 the medium-brown ground color. Except for a faint hint of dusky 

 pigment around the edge of the lower jaw, the ventral surfaces are 

 immaculate. 



Remarks. — The amount and degree of variation in the specimens 

 before us are hardly more than would be expected in any lot of speci- 

 mens collected and preserved by different persons at different times. 

 The type has faded to the point where no pattern is discernible but 

 it is perfectly recognizable structurally. The specimens from Colombia 

 range from 32.9 to 48.7 millimeters in head-and-body length. 



