44 XJ.S. NATIONAL MUSEUM BULLETIN 288 



the lateroventral border very irregular, with a small light drab spot 

 in front of groin but no definite light line; a few pale spots near the 

 swollen glandular area just above the groin; venter ecru drab with a 

 coarse seal brown reticulation over chin, chest, aDd belly; lower thigh 

 with a pale drab area on proximal half and with fine seal brown reticu- 

 lations over the remainder; lower surfaces of shank, foot, and inner 

 arm immaculate ecru drab; outer limb surfaces seal brown; palms of 

 hands and soles of feet seal brown, the disks, tubercles, and webs 

 ecru drab. 



Specimens Examined 

 COLOMBIA 



Cauca: Quintana, near Popayan, CNHM 54456 (holotype), and CNHM 

 44041, 44045-6, 54341, 54428, USNM 147228-9 (all paratypes); near Popa- 

 yan, CNHM 44042-3; Purace, USNM 151180-2. 



Phyllobates tliorntoni, new species 



Plate 8d-f 



Holotype. — AMNH 1347, an adult female from Medellin, Antioquia, 

 Colombia, collected by It. D. O. Johnson. 



Paratypes— AMNH. 1363, 1370, 1375, 38806-7, USNM 147511, all 

 from Medellin, Antioquia; AMNH 14016, 14020, USNM 147512, all 

 from Andes, Antioquia; CNHM 63889-90, 818778, USNM 147227, 

 MLS 163, 163a-b, all from Yarumal, Antioquia. 



Diagnosis. — Toes one-third webbed; sides seal brown in alcohol, 

 without any light dorsolateral or diagonal stripes; belly with dark 

 spots and reticulations on a light ground; adpressed heel usually 

 reaching to between eye and nostril, occasionally to posterior border 

 of eye; skin resistant to abrasion; size to 32.5 mm. 



The absence of any light dorsolateral stripe or light diagonal stripe 

 crossing the dark area in front of the groin places the new species close 

 to Phyllobates bicolor and P. chocoensis. It is distinguished from bicolor 

 by its webbed toes, and from both bicolor and chocoensis by its notched 

 tongue and other features. 



Description of holotype. — Tongue a little more than half as wide as 

 mouth opening, oval, its posterior border free and very slightly 

 notched; snout nearly truncate when viewed from above, broadly 

 rounded in profile, the upper jaw extending well beyond the lower. 

 Nostrils lateral, slightly projecting, their distance from end of snout 

 about one-half their distance from eye. Can thus rostralis distinct; 

 loreal region vertical and nearly flat, sloping down to the upper lip. 

 Eye large, prominent, its diameter 1% times its distance from tip of 

 snout; interorbital diameter equal to that of upper eyelid, a little less 

 than interval between nostrils. Tympanum distinct, its greatest 

 diameter about one-third that of eye, separated from eye by an in- 



