144 U.S. NATIONAL MUSEUM BULLETIN 2 88 



Atelopus walkeri Rivero 



Plate 20a-c 



1963. Atelopus walkeri Rivero, 1963c, p. 117, pi. 3, figs. 1-4 (type locality, Don 

 Diego, Santa Marta region, [Magdalena,] Colombia). 



Description. — MZUM 48007 (holotype), a male from Magdalena, 

 Colombia. Tongue one-third as wide a mouth opening, oval, its 

 posterior border free and unnotched; snout broadly acuminate when 

 viewed from above, straight and slanting backwards in profile, the 

 upper jaw extending far beyond the lower. Nostrils lateral, strongly 

 projecting, their distance from end of snout nearly as great as their 

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

 concave, vertical, descending to the upper lip. Eye large, prominent 

 its diameter a trifle less than its distance from tip of snout; interorbital 

 diameter twice that of upper eyelid, much greater than interval 

 between nostrils. Tympanum hidden. Fingers rather long, the tips 

 slightly bulbous, with weak lateral ridges, free, first finger much 

 shorter than second, fourth longer than either and reaching nearly 

 to base of penultimate phalanx of third; a small oval thumb pad 

 present; a large, flat palmar callus; metacarpal tubercles well devel- 

 oped. Toes moderately long, their tips bulbous, one-half webbed, 

 third and fifth subequal, their tips reaching beyond base of ante- 

 penultimate phalanx of fourth toe; a small oval inner metatarsal 

 tubercle and a smaller rounded outer one; a weak tarsal ridge, ending 

 before reaching heel; heavy skinfolds on heel and knee. Body fairly 

 stout, in postaxillary region equal to greatest width of head. When 

 hind leg is adpressed, heel reaches posterior border of eye; third 

 finger when adpressed reaching just beyond groin; when limbs are 

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

 bent at right angles to body, heels are slightly separated. Skin of 

 upper parts fairly smooth (pustular under lens), with some low 

 tubercles on head and a parotoid swelling behind the eye; a weak 

 middorsal ridge; venter smooth except for some minute transverse 

 wrinkles on belly, and granules below anus; a heavy glandular ridge 

 from posterior corner of eye along parotoid area, ending above 

 shoulder; a weak skinfold across the chest; a slight ventral disk; an 

 external vocal sac in the male. 



Dimensions. — Head and body, 39 mm.; head length, 12 mm.; head 

 width, 11 mm.; femur, 15.5 mm.; tibia, 15.5 mm.; foot, 15 mm.; 

 hand, 10.5 mm. 



Color in alcohol. — Dorsum light clay color, with many small sepia 

 dots on the head tubercles, forming a broken midline from snout tip 

 to anus where it forks and continues on back of femur; a faint chevron 

 of dark dots above shoulders; a heavier lateral sepia stripe from tip 



