FROGS OF COLOMBIA — COCHRAN AND GOIN 13 



procoelous. Sacral vertebra usually articulated with urostyle by a 

 double condyle. Ribs never present. 



Family Ranidae 



Sacral diapophyses cylindrical or very slightly dilated. No inter- 

 calary cartilage between penultimate and last digital phalanx. 



Subfamily Dendrobatinae 



Vertebral column uniformly procoelous. Shoulder girdle firmis- 

 ternal. Omosternum frequently bony. A pair of glandulomuscular 

 organs present on top of each terminal digit. Skin usually smooth 

 or faintly granular. In Dendrobates, the sacral and presacral vertebrae 

 are fused. 



Key to Colombian Genera of Dendrobatinae 



a. 1 No maxillary teeth present Dendrobates 



a. 2 More or less well-developed teeth on maxilla Phyllobates 



Genus Dendrobates Wagler 



1830. Dendrobates Wagler, p. 202 (type species, D. tinctorius Wagler). 



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

 behind. Tympanum more or less distinct. Fingers and toes free, 

 their tips dilated into disks subdivided above. Outer metatarsals 

 united. Omosternum a weak, semi-ossified style; sternum cartilagi- 

 nous. Terminal phalanges T-shaped. Maxillary and vomerine teeth 

 absent. 



Key to Colombian Species of Dendrobates 



a 1 . First finger nearly as long as second, or longer. 

 b l . First finger longer than second. 



c 1 . Heel reaching a point between anterior corner of eye and nostril; size to 



46 mm D. trivittatus 



c 2 . Heel reaching posterior corner of eye; size to 27.5 mm. . . . D. ingeri 

 b 2 . First finger nearly as long as second; heel reaching to center of eye. 



c 1 . A pale axillary spot; dorsolateral lines fine and sharp; reticulations on 



posterior half of belly only; size to 23 mm D. hahneli 



c 2 . No pale axillary spot; dorsolateral stripes relatively wide; venter with 

 light spots or reticulations evenly distributed; size to 34.5 mm. 



D. lugubris 

 a. 2 First finger much shorter than second. 



b 1 . Size small, not over 18 mm.; a diagonal gland halfway between heel and 



inner metatarsal tubercle. 



c 1 . A large white spot on underside of upper arm from axilla nearly to elbow. 



d : . Heel reaching to anterior border of eye; no definite dorsal stripes; 



size to 18 mm D. opisthomelas 



