372 U.S. NATIONAL MUSEUM BULLETIN 288 



considerably even in individuals of the same form and from the same 

 locality. 



The 33 forms of Eleutherodactylus that are recognized in this paper 

 appear to fall in four main groups. While no single characteristic may 

 fit every species or subspecies now included within a group, most of 

 the characteristics will apply to adults. Immature frogs are not yet 

 sufficiently known to point out their differences in proportion and 

 coloring here. 



Group I: Long-legged, smooth-bellied frogs with smooth heads, fairly large in size; 



no bony ridges on head. 

 Group II: Granular-bellied, shorter-legged frogs usually having a frontoparietal 



depression; bodies moderately long; no bony ridges on head. 

 Group III: Small frogs, usually with U- or ) (-shaped gular folds in the male; often 



with pointed toes; no bony ridges on head. 

 Group IV : Medium-sized to large frogs, usually with bony ridges on head or some 



ossification of head skin and skull. 



Keys to Colombian Species of Eleutherodactylus 



Group 1: Head without bony ridges; frontoparietal depression indistinct or 

 absent; belly usually smooth, at least anteriorly, sometimes with transverse 

 wrinkles or fine granules posteriorly; heel reaching a point between nostril and 

 beyond snout tip, except in E. bufoniformis. 



a 1 . Heel reaching anterior corner of eye; vomerine teeth transverse, heavy, 

 narrowly separated; toes slightly webbed; back with tubercles and 



glandular ridges; size to 81 mm E. bufoniformis 



a 2 . Heel reaching from nostril to far beyond snout tip. 

 b l . First finger longer than second. 



c 1 . Toes free or slightly webbed; size to 47.5 mm. . . E. conspicillatus 



c 2 . Toes one-half webbed; size to 52.5 mm E. anomalus 



b 2 . First and second fingers subequal, or first shorter than second. 

 c 1 . First and second fingers subequal. 

 d 1 . Toes at least one-fourth webbed. 



e 1 . Throat, chest, and belly immaculate white; no distinct dark 

 diagonal spots near knee; soles and palms pale brown; toe disks 

 not much darker than rest of foot; back smooth; not more 

 than one or two black tubercles above shoulder; distance of 

 nostril from snout tip three-fourths the distance from nostril 



to eye; size to 68 mm E. raniformis 



e 2 . Throat, chest, and belly dark-spotted; several dark, diagonal 

 spots near and on knee; soles and palms black; toe disks often 

 dark; back minutely granular; distance between nostril and 

 tip of snout one- third that from nostril to eye; often three 

 black tubercles above shoulder; size to 56 mm. 



E. longirostris 

 d 2 . Toes webbed at base only. 



e 1 . Dorsum pale tan with sharp, thin, dark chevrons; first and 

 second fingers with very small disks; size to 40.5 mm. 



E. brederi 



e 2 . No distinct pattern of dark dorsal chevrons; disks of inner fingers 



not unusually small; size to 33.5 mm E. lymani 



