270 U.S. NATIONAL MUSEUM BULLETIN 2 88 



Hyla parviceps Boulenger 



Plate 35d-f 



1882. Hyla parviceps Boulenger, 1882a, p. 393 (type locality, Ecuador, Sarayacu) ; 

 1884a, p. 638.— Nieden, 1926, p. 273.— Melin, 1941, p. 23.— Gorham, 

 1963, p. 22. 



Diagnosis. — A small brown frog with reduced webbing on the fingers, 

 short, rounded vomerine tooth patches, no patagium, a small tym- 

 panum, brightly marked thighs, and a distinct light patch on each side 

 below the region of the sacral hump. 



Description. — MLS 54, from Ceilan, west of Florencia, Caqueta, 

 Colombia. Vomerine teeth in two short, rounded series, lying close 

 together between the small, rounded choanae; tongue two-thirds as 

 wide as mouth opening, broadly cordiform, its posterior border very 

 slightly free and very shallowly notched. Snout short, rounded when 

 viewed from above, truncate in profile, the upper jaw barely extending 

 beyond lower; nostrils nearly entirely lateral, considerably projecting, 

 their distance from end of snout about one-half that from eye, sepa- 

 rated from each other by an interval equal to about their distance 

 from eye. Can thus rostralis well defined; loreal region concave and a 

 little oblique, the upper lip flaring out a little below it. Eye large, very 

 prominent, its diameter one-third again as great as its distance from 

 nostril; palpebral membrane not reticulate; interorbital distance 

 about equal width of upper eyelid, which is about equal distance 

 between nostrils. Tympanum small but distinct, about one-third the 

 diameter of eye, separated from eye by a distance equal to one-half 

 its own diameter. Fingers webbed at base, web on third finger reaching 

 distal end of antepenultimate phalanx on lateral side and proximal 

 end on medial side; fourth finger longer than second, just reaching to 

 disk of third which just covers the tympanic area; no projecting 

 rudiment of a pollex; no ulnar ridge. Toes slightly more than one-half 

 webbed, the web on fourth toe reaching the proximal end of the 

 penultimate phalanx, third and fifth toes subequal, disk of fourth toe 

 covering about two-thirds the tympanic area; a distinct oval inner and 

 a smaller indistinct rounded outer metatarsal tubercle; no tarsal 

 ridge; no dermal appendage on heel. Body not elongate, in postaxillary 

 region a little narrower than greatest width of head; when hind leg 

 is ad pressed, heel reaches just beyond tip of snout; when limbs are 

 laid along the side, knee and elbow overlap considerably; when hind 

 legs are bent at right angles to body, heels overlap appreciably. No 

 patagium. Skin of upper parts smooth; an indistinct narrow glandular 

 ridge encircling upper part of tympanum; skin of throat and chest 

 smooth, that of belly and lower surface of thigh uniformly and finely 



