354 U.S. NATIONAL MUSEUM BULLETIN 2 88 



1957. Sphaenophyla aurantiaca. — Goin, 1957, p. 21; 1958, p. 121. — Goin and 



Layne, 1958, p. 111. 

 1961. Dryomelictes lactea. — Goin, 1961, p. 8. 

 1961. Sphaenorhynchus aurantiaca. — Myers and Leviton, p. 61. 



Diagnosis. — A Sphaenorhynchus with a conspicuous dark stripe 

 along the canthus from nostril to eye, vomerine teeth, and the tym- 

 panum apparent. 



S. aurantiacus may be distinguished from S. dorisae by the presence 

 of the can thai stripe and from S. habrus by the presence of vomerine 

 teeth and having the tympanum apparent. 



Description. — MLS 17, from Puerto Narino, Amazonas, Colombia. 

 Vomerine teeth in two transverse series lying close together on a level 

 with the posterior borders of the small, rounded choanae; tongue 

 three-fourths as wide as mouth opening, ovate, longer than wide, its 

 posterior border free and unnotched. Snout short, pointed when 

 viewed from above, pointed in profile, the upper jaw extending very 

 considerably beyond lower; nostrils lateral, not projecting, their dis- 

 tance from end of snout about two-fifths their distance from eye, sepa- 

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

 distance from eye. Canthus rostralis sharply defined; loreal region flat 

 and vertical, the upper lip flaring not at all below it. Eye moderate, not 

 prominent, its diameter equal to its distance from nostril; palpebral 

 membrane not reticulate; interorbital distance about twice the width 

 of upper eyelid, which is slightly less than distance between nostrils. 

 Tympanum distinct, about one-third the diameter of eye, separated 

 from eye by a distance equal to about one-half its own diameter. 

 Fingers webbed, web reaching base of penultimate phalanx of third 

 finger, fourth considerably longer than second, reaching to proximal 

 one-third of disk of third which slightly more than covers the tympanic 

 area; first finger definitely narrower than others and partially oppos- 

 able; no projecting rudiment of a poll ex; a low ulnar ridge. Toes ex- 

 tensively webbed, the web on fourth toe reaching distal third of 

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

 practically covering the tympanic area; a distinct oval inner and a 

 smaller but equally distinct rounded outer metatarsal tubercle; a low 

 tarsal ridge; no dermal appendage on heel. A well-developed flap of 

 skin on each side of vent. Body not elongate, in postaxillary region a 

 little narrower than greatest width of head ; when hind leg is adpressed 

 heel reaches posterior margin of eye; when limbs are laid along the side, 

 knee and elbow overlap considerably; when hind legs are bent at right, 

 angles to body, heels overlap greatly. A patagium extends from back 

 of upper arm to side of body. Thighs very heavy for a hylid ; body in a 

 humped, cramped position, which is characteristic of frogs of this 

 genus when preserved. Skin of upper parts smooth. No distinct glandu- 



