298 U.S. NATIONAL MUSEUM BULLETIN 288 



rounded outer metatarsal tubercle; no tarsal ridge; no dermal append- 

 age on heel. Body not elongate, in postaxillary region distinctly but 

 not appreciably narrower than greatest width of head; when hind leg 

 is adpressed, heel reaches beyond tip of snout; 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 patagium 

 extends from back of upper arm to side of body. Skin of upper parts 

 smooth; a rather narrow glandular ridge encircles the upper part of 

 tympanum; skin of throat and chest smooth except for the pair of 

 pectoral glandular patches which are characteristic of this species; that 

 of belly and lower surface of thigh uniformly and very finely granular; 

 a well-developed skinfold across chest; vocal sac, subgular pouch with 

 longitudinal folds. Skin of head not co-ossified with skull, roof of skull 

 not exostosed. 



Dimensions. — Head and body, 25.6 mm.; head length, 9.4 mm.; 

 head width, 9.1 mm.; femur, 13 mm.; tibia, 14.6 mm.; heel-to-toe, 

 20.5 mm.; hand, 7.9 mm. 



Color in alcohol. — A brightly colored, gaudy frog. In preservative 

 the dorsal ground color is medium brown on which is imposed a 

 pattern of gray (silver in life) markings. There is a very sharp line 

 of demarcation between the dorsal ground color and the completely 

 pigmentless ventral surfaces. The dorsal ground color extends over 

 the entire face, upper lips, top of head, and the posterior margin of 

 the lower jaw. On the back it extends laterally to a line drawn from 

 the posterior edge of the tympanum to the vent. It also covers the 

 dorsal surface of the upper and lower arms, the top of the lateral 

 half of the hand, and extends out onto the lateral two fingers. On 

 the hind limb it is absent from the thigh except for a very narrow 

 streak on the distal end of the dorsal surface. However, it covers 

 the dorsal surface of the crus and the lateral third of the foot and 

 extends out onto the two lateral toes. On this dorsal ground color 

 the following light pattern is imposed : a triangular area on top of the 

 head between the eyes and nostrils; a postocular light stripe which 

 extends posteriorly for nearly half the length of the body; scattered 

 light dots and streaks on the dorsal surface; a light spot on each 

 elbow and wrist; a light spot on each knee, heel, and ankle joint and 

 on the base of the fifth toe; and a crossband on the middle of the 

 crus and the upper segment of the foot. 



Variation. — The most conspicuous difference that can be noted in 

 the Colombian specimens is that of size. The head-body length of 

 the larger females ranges from 29 to 34 millimeters while that of the 

 smaller males ranges from 23 to 25 millimeters. 



In life the ground color of the dorsum in this species is brownish, 

 while the upper parts are bright salmon pink. A triangular patch 



