FROGS OF COLOMBIA — COCHRAN AND GOIN 145 



of snout along can thus, behind eye, along sides to groin; concentra- 

 tions of pale sepia spots on upper proximal half of femur and across 

 tibia and foot; upper half of posterior femur pale buff, lower half 

 sepia, the two colors irregularly divided; side of head mottled with 

 pale sepia; edge of upper lip white with a darker sepia line just above 

 it; olive buff with small sepia spots on chest, and larger ones on belly, 

 seemingly arranged in broken transverse series; a large sepia postanal 

 patch; lower surfaces of tibia and foot with sepia vermiculations ; 

 palms of hands and soles of feet olive-buff, the tips of the digits a 

 little darker. 



Remarks. — As suggested by Rivero, Atelopus walkeri resembles the 

 Venezuelan A. oxyrhynchus and A. cruciger cruciger rather closely, 

 although oxyrhynchus has larger glandular warts on the flanks and 

 less webbing between the toes, and cruciger cruciger has a very distinc- 

 tive dark dorsal pattern. A. cruciger vogli is rougher dorsally and has 

 longer limbs, as the adpressed heel reaches the nostril or snout tip and 

 the third finger reaches well beyond the end of the body. 



The similarity of A. walkeri and A. subornatus also was discussed 

 by Rivero. The only available Bogota example of the latter (USNM 

 95177) has the third finger extending slightly beyond the end of the 

 body, and the inner and outer metatarsal tubercles are distinct only 

 when the foot is bent. The tubercles below the digits are distinct, 

 but this may be due to the preservation. 



The holotype is the only known example of A. walkeri. 



Family Hylidae 



Frogs with procoelous vertebrae, a double condyle on the coccyx; 

 arciferal girdle, short intercalary cartilages between the ultimate and 

 penultimate phalanges, and claw-shaped terminal phalanges. 



From the four other families of frogs with intercalary cartilages 

 this family may be distinguished as follows: from the Centrolenidae 

 in having the terminal phalanges claw-shaped rather than T-shaped; 

 from the Pseudidae in having the intercalary cartilages disk-like 

 rather than elongate and rod-like; and from both the Rhacophoridae 

 and Phrynomeridae in being procoelous and arciferal rather than 

 diplasiocoelous and firmisternal. 



Key to Colombian Genera of Hylidae 



a 1 . Pupil horizontal. 



ft 1 . Roof of skull exostosed. 

 c 1 . No teeth on parasphenoid. 

 d l . Vocal pouch paired. 



e 1 . A well-developed helmet Cerathyla 



e 2 . No well-developed helmet Osteocephalus 



