20 U.S. NATIONAL MUSEUM BULLETIN 2 88 



upper lip. Eye large, prominent, its diameter equal to its distance 

 from tip of snout; interorbital diameter twice that of upper eyelid, 

 a little greater than interval between nostrils. Tympanum large, 

 distinct, its greatest diameter three-quarters that of eye, its anterior 

 border practically in contact with eye socket. Fingers long, with 

 faint lateral ridges, free, first finger a little shorter than second, 

 which equals fourth; tips of second and fourth fingers reaching to 

 base of penultimate phalanx of third, the disk of which covers about 

 one-third the tympanum; a very small round thumb pad present; a 

 large palmar callus; metacarpal tubercles well developed. Toes mod- 

 erate, third toe longer than fifth, its disk reaching halfway on ante- 

 penultimate phalanx of fourth; disk of fourth toe covering one-third 

 the tympanum and nearly the same size as that of third finger; a 

 small oval inner metatarsal tubercle and a round outer one of about 

 the same size; a faint tarsal ridge, ending in a short diagonal gland 

 midway to heel; a heavy skinfold on heel and knee. Body rather 

 elongate, in postaxillary region narrower than greatest width of head. 

 When hind leg is adpressed, heel reaches center of eye; when limbs 

 are laid along the sides, knee and elbow overlap; when hind legs are 

 bent at right angles to body, heels overlap. Skin of upper parts 

 finely granular; a wide flat dorsolateral gland from tip of snout, 

 above eyelid and along sides to groin; venter nearly smooth, with 

 a few pustules on chest, on posterior abdomen, and below anus; 

 no supratympanic ridge; a few fine skinfolds across the chest and 

 throat; a ventral disk; apparently no external vocal sacs in the male. 



Dimensions. — Head and body, 31.5 mm.; head length, 10 mm.; 

 head width, 10 mm.; femur, 13 mm.; tibia, 14.5 mm.; foot, 12 mm.; 

 hand, 10 mm. 



Color in alcohol. — Dorsum black, with a slate-gray dorsolateral 

 stripe covering the gland from tip of snout to groin; a large roundish 

 gray spot on proximal part of anterior femur, and an elongate ir- 

 regular gray spot on outer half of femur, ending on knee; posterior 

 femur with large irregular gray spots on a black ground; tibia, foot 

 upper arm, and forearm similarly spotted; venter black with wide 

 gray crossbands or spots; lower limb surfaces similarly marked; 

 sides of head black, with a gray crescentic mark below eye; palms 

 of hands and soles of feet black, the tubercles and disks drab-gray. 

 Some juveniles (USNM 147159-63) have light areas on back, and 

 sides chromium to apple green; light areas of belly olive-yellow, the 

 chin sometimes citron yellow. 



Remarks. — This species has been considered in the genus Phyllo- 

 bates by Dunn (1924) and by Taylor(1952), although Dunn (1944c) 

 later reversed his opinion by restoring it to the genus Dendrobates. 

 As there are no traces of maxillary teeth in the numerous Colombian 



