FROGS OF COLOMBIA — COCHRAN AND GOIN 271 



granular; traces of a skinfold across chest; gravid adult female, no 

 vocal sac. Skin of head not co-ossified with skull, roof of skull not 

 exostosed. 



Dimensions. — Head and body, 21.8 mm.; head length, 7.3 mm.; 

 head width, 7.4 mm.; femur, 11.1 mm.; tibia, 12.6 mm.; heel-to-toe, 

 15.5 mm; hand, 5.6 mm. 



Color in alcohol. — A light brown frog with bright markings on the 

 thighs. The top of head and dorsum are a nearly uniform light brownish 

 except for a ramus of the ventral ground color on each side that 

 starts upward just anterior to the groin, becoming lighter as it rises, 

 and then terminates in a point just below the sacral hump. The 

 thighs are dark in color with distinct yellowish blotches on the 

 anterior and dorsal surfaces and a single yellow spot near the base 

 of each thigh on the posterior surface. The ventral surfaces, in- 

 cluding the undersides of hands and feet, are rather heavily pigmented 

 with dark gray. 



Remarks. — The few specimens we have seen of this distinctive little 

 frog are rather uniform. The main variation is in the intensity of 

 pigmentation rather than in pattern or structure. 



The specimen described above was directly compared with the 

 type in the British Museum and structurally the two were found 

 to be identical. The type has a white blotch on the throat and chest, 

 while the MLS specimen is uniformly dark underneath. 



When the described specimen was compared with a specimen from 

 Acre, Brazil (WCAB 2511) the Brazilian specimen was found to 

 differ only in being a little more warty on top of the head and in 

 having a small wart on the apex of each eyelid. The Brazilian specimen, 

 like the type, has a white patch on the chest and anterior part of 

 the belly. 



Specimens Examined 

 COLOMBIA 



Amazonas: Rfo Apaporis, MCZ 28058-9. 

 Caqueta: Ceilan, west of Florencia, MLS 54. 

 BRAZIL: Acre, WCAB 2511. 



ECUADOR: Sarayacu, BM 80.12.5.214 [1947.2.13.51] (type); Banos, BM 

 1889.10.30.9. 



17. MARMORATA group 



Moderate-sized tree frogs with well-developed, brightly marked 

 patagia and with well-developed ulnar and tarsal ridges. The true 

 status of several nominal forms in this group (senicula, melanargyrea, 

 giesleri) has yet to be determined. 



Only one form is at present known from Colombia. 



