138 U.S. NATIONAL MUSEUM BULLETIN 2 88 



coarsely granular on belly and lower femur; a short, heavy, bony ridge 

 from posterior corner of eye above tympanic area, ending just above 

 angle of jaw. No skinfold across the chest; no ventral disk; no external 

 vocal sacs in the male, but forearms thickened near elbow. 



Dimensions. — Head and body, 33 mm.; head length, 10 mm.; head 

 width, 8.5 mm.; femur, 13 mm.; tibia, 14 mm.; foot, 11.5 mm.; hand, 

 8.5 mm. 



Color in alcohol. — Dorsum immaculate Vandyke brown in this speci- 

 men; belly light clay color; chin and throat sepia; lower surfaces of 

 arms and legs pale sepia except for proximal area of femur including 

 postanal region, which is clay color like the belly, and with a sharp 

 division between the two colors across the lower proximal part of 

 femur, sides of body vandyke brown, with a serrate border where this 

 color meets the ventral tone; side of head dull vandyke brown, with a 

 lighter area in front of eye extending to border of upper lip and a 

 more distinct clay colored spot at commissure of jaws; no crossbars 

 on legs, but a darker brown color around the base of each tubercle; 

 palms of hands and soles of feet sepia, with the webs and tubercles 

 light clay color. 



Variation. — Four of the other examples from Antioquia are im- 

 maculate vandyke brown above, like the described specimen, and the 

 remainder have large or small light dorsal spots, usually concentrated 

 on the snout and parietal region, with a more or less apparent light 

 dorsolateral line and with faint traces of dark and light crossbars on 

 the legs. MLS 170 from Cundinamarca has a slightly smoother skin, 

 while the tip of its snout is less pointed than others of similar size 

 from Antioquia. These small differences, however, do not warrant its 

 separation as a subspecies. 



Remarks. — There is a definite suggestion of relationship between 

 Atelopus varius bibroni and A. spurrelli in body proportions as well as 

 in color pattern. Both have the wide dark brown lateral stripe, but in 

 the lighter examples of A. v. bibroni the back (between these stripes) 

 has no pale chevrons outlining more or less regular dark patches; in- 

 stead, there are irregular elongate dark spots arranged haphazardly 

 in three rows, or the back may be uniformly dark as in the described 

 specimen. 



Colombian Specimens Examined 



Amazonas: Rio Apaporis, USNM 144931-2 (juv.). 



Antioquia: Andes, AMNH 14149; Antioquia, AMNH 3208; Medellin, AMNH 



1340, 1345-6, 1377-8, 13537-8, 39088, USNM 147505. 

 BoLfvAR(?) : Probably upper Sinu River, CNHM 61755 (juv.). 

 Caldas: Laguneta, ANSP 25365-8; Pereira, MLS 312-3; Quindfo, MLS 171. 

 Cundinamarca: MLS 170. 



Cauca: El Tambo, ANSP 25369 (tentatively identified). 

 Narino: Ricuarte, ANSP 25362, 25671 (tentatively identified). 



