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U.S. NATIONAL MUSEUM BULLETIN 2 88 



posterior border not free and not notched. Snout short, ovate when 

 viewed from above, sloping in profile, the upper jaw extending slightly 

 beyond lower; nostrils more lateral than superior, not projecting, 

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

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

 their distance from eye. Can thus rostralis well defined; loreal region 

 concave and very oblique, the upper lip flaring out below it. Eye 

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

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

 relatively wide, definitely greater than distance between nostrils. 

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

 separated from eye by a distance nearly equal to twice its own di- 

 ameter. Fingers with a trace of web at base, fourth finger considerably 

 longer than second, reaching to disk of third, which more than covers 

 the tympanic area; an external swelling indicating a rudiment of a 

 pollex. Toes slightly more than one-half webbed, web reaching middle 

 of antepenultimate phalanx of fourth toe, third and fifth toes sub- 

 equal, disk of fourth toe covering the tympanic area; a distinct oval 

 inner, but no distinct outer, metatarsal tubercle; no tarsal ridge; no 

 dermal appendage on heel. Body moderately elongate for a Gastrotheca, 

 in postaxillary region definitely narrower than greatest width of head; 



Figure 10. — Gastrotheca cornutum, CNHM 63892 (same size). 



