FROGS OF COLOMBIA — COCHRAN AND GOIN 373 



c 2 . First finger shorter than second. 



d 1 . Diameter of eye equal to distance from eye to tip of snout; toes 

 slightly webbed. 

 e 1 . Interorbital diameter 1% times the width of upper eyelid; tym- 

 panum small, its diameter one-fourth that of eye; diameter of 

 disk of third finger and of fourth toe equal to three-fourth the 

 diameter of tympanum; belly often finely granular posteriorly; 

 usually a tubercle on upper eyelid; heel reaching from anterior 

 corner of eye to just beyond snout tip; size to 2S.5 mm. 



E. calcaratus 



e 2 . Interorbital diameter equal to width of upper eyelid; diameter of 



tympanum one-half that of eye; disk of third finger two-thirds 



the area of tympanum, that of fourth toe one-half the area of 



tympanum; size to 42 mm E. terraebolivaris 



d 2 . Diameter of eye equal to three-fourths the distance from eye to 

 tip of snout; interorbital diameter equal to width of upper eyelid; 

 diameter of tympanum equal to one-half that of eye; size of 

 disk of third finger and of fourth toe equal to area of tympanum; 

 belly smooth anteriorly, often finely granular posteriorly; size to 



59 mm E. w-nigrum 



Group II: Head without heavy bony ridges; usually a distinct frontoparietal 

 depression; belly more or less granular; heel usually not reaching beyond tip of 

 snout. (The fine skin glands and ridges on the heads of some species in this 

 group should not be mistaken for the relatively heavy bony ridges character- 

 istic of Group IV. These dermal ridges on the head sometimes appear in quite 

 young individuals of Group II but may not be present at all in others of the 

 same species. The ridges apparently do not have bony ridges beneath them. 

 The degree to which the tubercles and glands between the shoulders and in 

 other places on the back is emphasized by dark pigment is highly variable, as 

 is the development of such tubercles and glands.) 



a 1 . No vomerine teeth; belly finely granular; size to 20.5 mm. . . E. palmeri 

 a 2 . Vomerine teeth present. 



b 1 . Tympanum concealed; toes faintly webbed. 



c 1 . Upper jaw projecting slightly beyond lower; pronounced lateral 



ridges on fingers; size to 39 mm E. surdus cabrerai 



c 2 . Upper jaw projecting well beyond lower; no lateral ridges on fingers; 



size to 28 mm E. delicatus 



b 2 . Tympanum usually distinct, although sometimes small. 

 c 1 . Heel not reaching beyond posterior corner of eye. 

 d 1 . Back finely granular. 



e 1 . Digital disks fairly large; interorbital diameter V/2 times the 

 width of eyelid. 

 f l . Toes free; heel reaching to posterior corner of eye; size to 31.5 



mm E. bogotensis 



f 2 . Toes slightly webbed; heel reaching to posterior border of 



tympanum; size to 32 mm E. lehmanni 



e 2 . Digital disks very small; toes slightly webbed; heel reaching to 

 front of shoulder; interorbital diameter almost twice the 



width of eyelid; size to 21.5 mm E. nicefori 



d 2 . Back smooth; interorbital diameter V/ times the width of eyelid; 

 toes webbed at base; heel reaching to posterior corner of tym- 

 panum; size to 45.5 mm. ; E. elegans 



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