46 U.S. NATIONAL MUSEUM BULLETIN 288 



It is appropriate to dedicate this species to Dr. Wilmot A. Thornton, 

 whose Colombian collections have aided greatly in the present study. 



Phyllohates chocoensis (Boulenger) 



Plate 9a-b 



1912. Hylixalus chocoensis Boulenger, p. 190 (type locality, Rio San Juan, 



Choc6, Colombia). 

 1944. Hyloxalus chocoensis. — Dunn, 1944c, p. 519. 

 1963. Prostherapis chocoensis. — Gorham, 1963, p. 25. 



Description. — BM 1929.2.1.5, an adult from south of Santa Barbara, 

 Antioquia, Colombia. A pair of weak bony ridges on top of head. 

 Tongue almost two-thirds as wide as mouth opening, oval, its posterior 

 border free and unnotched; snout nearly truncate when viewed from 

 above, truncate and sloping slightly backward in profile, the upper 

 jaw extending well beyond the lower. Nostrils lateral, slightly pro- 

 jecting, their distance from end of snout about one-half their distance 

 from eye. Can thus rostralis curved, rather blunt; loreal region vertical, 

 flat, merging gradually with the upper lip. Eye large, prominent, its 

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

 iy 2 times that of upper eyelid, equal to interval between nostrils. 

 Tympanum distinct anteriorly, less so posteriorly, its greatest di- 

 ameter about one-third that of eye, separated from eye by an interval 

 equal to one-half its own diameter. Fingers moderate, with lateral 

 ridges and rather large disks, free, first finger shorter than second, 

 fourth longer than either and reaching almost to base of disk of 

 third, which covers nearly half the tympanum; a very small oval 

 thumb pad present; a large heart-shaped palmar callus; metacarpal 

 tubercles well developed. Toes moderate, one-half webbed, third toe 

 a little longer than fifth, its disk reaching to base of antepenultimate 

 phalanx of fourth; disk of fourth toe covering about half the tympanum 

 and approximately equal to that of third finger; a distinct oval inner 

 metatarsal tubercle and a smaller rounded outer one; a sharp tarsal 

 ridge, ending diagonally halfway to heel; a distinct skinfold on heel 

 and knee. Body rather stout, in postaxillary region nearly equal to 

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

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

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

 are separated. Skin of upper parts finely pustular or shagreened, 

 with numerous irregular fine glandular ridges; skin normal, not 

 easily torn; venter pustular with a few fine glandular ridges on 

 posterior half; no glandular ridge behind eye; a pair of indistinct 

 wide dorsolateral ridges, with some elongate lateral tubercles on sides 



