FROGS OF COLOMBIA — COCHRAN AND GOIN 497 



Napo, Ecuador).— Boulenger, 1882a, p. 188.— Noble, 1920, p. 441 — 

 Nieden, 1923, p. 369.— Taylor, 1951, p. 33.— Goin, 1961, p. 103. 1964, 

 p. 5.— Gorham, 1963, p. 24. 



Diagnosis. — A large centrolenid (adult males attain head-body 

 lengths of 77 mm.) with vomerine teeth, small eyes, and enlarged 

 projecting humeral spines. 



Centrolene geckoideum can be immediately distinguished from 

 all other centrolenids by its large size and by the presence, in males, 

 of large, protruding humeral spines that have their tips projecting 

 well beyond the integument and fitting into antra in the enlarged 

 forearms. Fresh specimens of Centrolene geckoideum from Colombia 

 differ from all Centrolenella that we know by having the digital 

 disk of the third finger large enough to cover the eye, whereas a 

 feature of Centrolenella is the large eye — much larger than the digital 

 disks. Also, Centrolene geckoideum is characterized by its short legs, 

 with the heel of the adpressed leg reaching only to the eye, while 

 in the other centrolenids it reaches or extends beyond the tip of the 

 snout. 



Description. — CNHM 69704, from P&ramo Frontino, Urrao, 

 Antioquia, Colombia. Vomerine teeth in two short, transverse series 

 lying between the anterior halves of the choanae; tongue one-half 

 as wide as mouth opening, nearly round, the posterior border free 

 and very slightly notched; snout large, truncate when viewed from 

 above and truncate in profile, the upper jaw not extending appreci- 

 ably beyond lower; nostrils near tip of snout, their distance from 

 end of snout about one-third that from eye, separated from each 

 other by an interval equal to about two-thirds their distance from 

 eye. Can thus rostralis moderately defined; loreal region slightly 

 concave. Eye moderate for a tree frog this size, its diameter slightly 

 less than its distance from nostril; interorbital diameter greater than 

 width of upper eyelid, equal to the distance between nostrils. Tym- 

 panum very indistinct, about one-fourth the diameter of eye, sepa- 

 rated from eye by a distance nearly equal to three times its own 

 diameter. Fingers fully webbed between digits 3 and 4 and with 

 marginal fringes extending along sides of digits 1, 2, and 3 to their 

 well-developed digital disks. The digital disks of fingers 2, 3, and 4 

 each large enough to completely cover an eye when placed over it. 

 Fingers 3-4-2-1 in order of decreasing length. No external evidence 

 of a pollex, the tip of fourth finger on right hand dissected to expose 

 terminal phalanx. A well-developed, sharp spine is present on each 

 humerus; it emerges from the chest integument in a hillock of what 

 is apparently glandular tissue, and the sharp tip fits into an antrum 

 on the median side of forearm just proximal to base of thumb. Toes 



