FROGS OF COLOMBIA — COCHRAN AND GOIN 29 



in line with the vertical upper lip. Eye large, prominent, its diameter 

 equal to its distance from tip of snout; interorbital diameter a trifle 

 greater than that of upper eyelid, equal to interval between nostrils. 

 Tympanum distinct except on posterior rim, its greatest diameter 

 two-third that of eye, separated from eye by an interval equal to 

 one-third its own diameter. Fingers moderate, without lateral ridges, 

 free, first finger shorter than second, which is equal to fourth; tips of 

 second and fourth fingers reaching to base of penultimate phalanx of 

 third, the tip of which covers half the tympanum; a very weak thumb 

 pad present; a weak palmar callus; metacarpal tubercles scarcely 

 indicated. Toes moderate, third toe longer than fifth, the disk of which 

 reaches almost to base of penultimate phalanx of fourth; disk of 

 fourth toe covering about one-fourth the tympanum and much smaller 

 than that of third finger; a small, round, prominent inner metatarsal 

 tubercle, and a smaller round outer one; no tarsal ridge; a skinfold on 

 heel and knee. Body elongate, in postaxillary region narrower than 

 greatest width of head. When hind leg is adpressed, heel reaches 

 posterior corner of eye; when limbs are laid along the sides, knee and 

 elbow touch; when hind legs are bent at right angles to body, heels 

 touch. Skin of upper parts smooth (minutely pustular under the lens) ; 

 venter smooth; no glandular ridge from posterior corner of eye, but 

 a slight swelling in parotoid area; no skinfold across chest; no ven- 

 tral disk; no external vocal sac apparent in male. 



Dimensions. — Head and body, 33.5 mm.; head length, 10.5 mm.; 

 head width, 10 mm.; femur, 13.5 mm.; tibia, 14.5 mm.; foot, 12 mm.; 

 hand, 10 mm. 



Color in alcohol. — Dorsum wood brown, with a large round white 

 spot encircled by a darker border on center of back; venter dark 

 sepia, with a large rectangular dark-bordered white spot covering 

 throat and chest and another on the posterior part of belly; limbs 

 wood brown above, with an oval white spot on posterior surfaces of 

 femur and tibia and on top of foot and forearm; upper lip white from 

 eye forward, including lower anterior snout; rest of head brown; 

 palms of hands and soles of feet brown, the disks a little paler. 



Remarks. — This form, whose Latin name means "relating to acting," 

 is another of the frogs having a clown-suit pattern. This pattern is 

 somewhat more regular than in Dendrobates tinctorius chocoensis, 

 however, as there is usually a large light spot between the eyes, often 

 covering the whole snout anterior to them. Sometimes a large round 

 or oval light spot occurs on the back above the shoulders, and another 

 on the sacrum, or the entire back may be light. Often, the belly is 

 black, with a large light spot on chin and chest and another one 

 covering the posterior half of the abdomen. An exception is USNM 

 144945, a specimen in which the venter is light except for a black 



