134 U.S. NATIONAL MUSEUM BULLETIN 2 88 



1894. Atelopus elegans. — Boulenger, 1894, p. 375; 1898a, p. 119. — Peracca, 1904, 

 p. 22.— Parker, 1926, p. 553.— Nieden, 1926, p. 81.— Dunn, 1944c, p. 

 518.— Rivero, 1963c, p. 107.— Gorham, 1963, p. 24. 



1905. Atelopus gracilis Barbour, p. 102 (type locality, Gorgona Island, Colom- 

 bia) .—Parker, 1926, p. 553.— Nieden, 1926, p. 83.— Griffiths, 1954, 

 pp. 40, 47. 



Description. — USNM 52401, an adult female fiom Gorgona Island, 

 Colombia. Head a little longer than broad, about one-third to one- 

 fourth of the total length; tongue one-third as wide as mouth opening, 

 oval, its posterior border free and unnotched; snout rounded at tip 

 when viewed from above, sloping backwards to mouth in profile, 

 the upper jaw extending well beyond the lower. Nostrils lateral, 

 slightly projecting, their distance from end of snout one- third their 

 distance from eye. Can thus rostralis distinct, curved slightly; loreal 

 region concave, vertical, descending to the vertical upper lip border. 

 Eye large, prominent, its diameter equal to its distance from tip of 

 snout; interorbital diameter 1% times that of upper eyelid, equal to 

 interval between nostrils. Fingers long, webbed at base, with lateral 

 ridges, first finger not well developed and much shorter than second, 

 which is also rather short; fourth finger normal, reaching nearly 

 halfway on penultimate phalanx of third; a small, weak thumb pad 

 present; a larger round palmar callus; metacarpal tubercles not 

 developed. Toes long, one-half webbed, third toe shorter than fifth, 

 which reaches hallway along the antepenultimate phalanx of fourth; 

 a faint, oval inner metatarsal tubercle and a more distinct round outer 

 one; no subarticular tubercles on foot; no tarsal ridge; a heavy skin- 

 fold on heel and knee. Body slender, elongate, in postaxillary region 

 narrower than greatest width of head. When arm is adpressed, base 

 of second finger reaches to end of body; when hind leg is adpressed, 

 heel reaches a point between eye and nostril; 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 thin, 

 anteriorly nearly smooth; a few granulations on sides and sacral 

 region; venter anteriorly with many minute transverse wrinkles on 

 throat and chest, granulate on posterior belly and lower femur; a 

 weak glandular ridge from posterior corner of eye ending above 

 shoulder; no skinfold across the chest; no ventral disk; no external 

 vocal sacs in the male, but forearm greatly thickened near elbow, 

 so that arm cannot be straightened. 



Dimensions. — Head and body, 32.5 mm.; head length, 8.5 mm.; 

 head width, 8 mm.; femur, 14.5 mm.; tibia, 16 mm.; foot, 12.5 mm.; 

 hand, 9 mm. 



Color in alcohol. — (ANSP 23177 from Gorgona Island, Colombia, 

 has been chosen for the color description, since USNM 52401 is badly 



