FROGS OF COLOMBIA — COCHRAN AND GOIN 37 



gether on outer parts and merge into a nearly uniform slate color 

 on lower surfaces of limbs and posterior part of belly; throat, chest, 

 and anterior half of belly cinerous, immaculate; a black crescentic 

 mark around lower anterior rim of tympanum; nostrils and borders 

 of lips black; soles and palms slate gray, the disks and tubercles 

 much paler. 



While alive (at the National Zoological Park in Washington, 

 D.C.) this frog and 11 others from the same region had bright red- 

 orange backs, and the upper surfaces of the femur, tibia, and arm 

 were yellowish. 



In alcohol, the Peruvian example (CAS 85151) is straw yellow to 

 cream color, with large black spots between the shoulders merging 

 into a black network on posterior half of back; lower surfaces of limbs 

 black; a triangular black mark on center of belly; chest and throat 

 with scattered black dots; and disks and tubercles of hands and 

 feet dark brown. 



Remarks. — In its critical measurements, this species shows no 

 more than a normal coefficient of variability — that is, from 4.6 to 

 6.0. The toes lack webs, and the tongue is unnotched. The skin is 

 resistant to abrasion, as most of the recently collected specimens 

 and many of the older examples are quite free of holes or tears. The 

 heel reaches the anterior border of the eye or as far as the nostril 

 in over 80 percent of the frogs examined; in less than 20 percent 

 it reaches the center or the posterior border of the eye. The body 

 length of 42.5 millimeters places Phyllobates bicolor among the largest 

 species of the genus. 



Specimens Examined 

 COLOMBIA 



Antioquia: Andes, AMNH 14028-9 (paratypes of P. nicefori Noble); 



MedeMn, AMNH 13540, 39081. 

 Caldas: Santa Cecilia, Pueblo Rico, CNHM 54183, 54187, 54189, 54193-4, 

 54196, 54204-5, 54207, 54212, 54221, 54233, USNM 147225-6, ANSP 25755. 

 Cauca: Popayan, USNM 137359-70; Quintana, 3,200 m., AMNH 54183. 

 Choc6: 75 mi. south of Andagoya, USNM 139776-7; Atrato River, USNM 

 53168, 53170-1; Juntas de Tamana, BM 1910.7.11.53; 10-15 km. west of 

 Playa de Oro, USNM 146630-1, 147204-7, 150632-7; mountains above 

 Playa de Oro, USNM 150638-42; Rio San Juan, USNM 144994; Rio Sipi 

 headwaters, 5,000 ft., BM 1915.10.21.46-7; Rio Truando, USNM 48865, 

 122104 [formerly USNM 4349]; Sierra de Baud6, ANSP 25490; upper Atrato 

 River, ANSP 25756. 

 Valle: Camp Carton de Colombia, lower Calima River, USNM 149723-7; 

 El Pailon, 12 km. from Buenaventura, USNM 145105; lower Rio Calima, 

 USNM 14506; Virology Field Station, Rio Raposo, USNM 151381. 

 PERU: Tingo Maria, CAS 85151. 

 337-262—70 i 



