118 U.S. NATIONAL MUSEUM BULLETIN 288 



Family Atelopodidae 



Girdle firmisternal. No omosternum. Sacral diapophyses dilated. 

 Eggs laid in water. Tadpoles aquatic. 



Genus Atelopus Dumeril and Bibron 



1841. Atelopus Dumeril and Bibron, p. 660 (type species, A. flavescens Dumeril 

 and Bibron). 



Generic diagnosis. — Pupil horizontal. Tongue elliptical, entire, free 

 behind. Palate smooth. No tympanic disk. Fingers free or webbed 

 at base; toes more or less webbed, the tips not dilated into regular 

 disks; one or more digits sometimes lacking. Outer metatarsals united. 

 Coracoids and precoracoids more or less divergent, connected by the 

 epicoracoid cartilage; no omosternum; sternum cartilaginous. Diapo- 

 physes of sacral vertebra moderately dilated. Terminal phalanges 

 simple. 



Key to Colombian Species of Atelopus 



a 1 . Arms and legs massively developed; size to 53 mm .... A. pachydermus 

 a 2 . Arms and legs not unusually large. 



ft 1 . Upper jaw not, or scarcely, projecting beyond lower; color mainly black. 

 c 1 . Fourth toe long, other toes poorly developed and relatively short; 



tympanum hidden; size 30 mm A. bufoniformis 



c 2 . All toes normally developed; tympanum distinct anteriorly; size to 



48 mm A. ebenoides ebenoides 



b 2 . Upper jaw extending appreciably beyond lower. 



c 1 . Eye diameter equal to or slightly greater than snout length. 



d 1 . Skin thickened, often rough and tubercular; metacarpal tubercles 

 well developed. 

 e 1 . Belly slate color with large light paired spots; size to 45.5 mm. 



A. ebenoides marinkellei 



e 2 . Belly immaculate cream; size to 50 mm A. ignescens 



d 2 . Skin thinner, fairly smooth above. 



e 1 . Metacarpal tubercles absent or weak; toes one-half webbed. 

 /'. Heel not reaching beyond posterior corner of eye. 



g l . Heel not reaching beyond front of shoulder or angle of jaw. 

 h l . Belly light, throat and chest with dark longitudinal spots; 



size to 37.5 mm A. varius subornatus 



h 2 . Belly dark with a few large light spots; size to 28.5 mm. 



A. pedimarmoratus 

 g 2 . Heel reaching to posterior corner of eye; venter pale, immacu- 

 late, throat with a dark spot; size to 25 mm . A. nicefori 

 P. Heel reaching between center of eye and nostril. 



g l . Belly light anteriorly, dark -spotted posteriorly; size to 23.5 



mm A. spurrelli 



g 2 . Venter immaculate; size to 32.5 mm ... A. varius elegans 

 e 2 . Metacarpal tubercles well developed. 

 /'. Heel reaching center of eye or beyond; toes nearly completely 

 webbed; size to 38 mm A. longibrachius 



