32 Proceedings of the Biological Society of Washington. 



Type.— Cat. No. 55,320 U. S. N. M. ; Signal Loma, three miles south 

 of San Isabel, north coast of Panama; C. G. Holland, collector. 



Description of type specimen. — Tongue longer than broad; palatine 

 teeth in a nearly straight line across the whole width of the palate behind 

 the choanae, interrupted in the middle; vomerine series V shaped, con- 

 verging behind, ending anteriorly in an elevation in front of the choanae ; 

 snout with a short, compressed, pointed, dermal flap; upper eyelid with 

 a median triangular dermal pyramid ending in a pointed conical tubercle; 

 distance between nostrils slightly less than half their distance from tip to 

 snout, and half their distance from orbit; width of upper eyelid equal 

 to distance of nostrils from snout; interorbital space twice as wide as 

 upper eyelid ; distance between points of horns of helmet much less than 

 their distance from tip of snout ; posterior outline of casque rounded ; 

 tympanum very distinct, its longest diameter more than three-fourths the 

 diameter of orbit; a bony tubercle at angle of mouth; fingers long, slen- 

 der, with a rudiment of web and well-developed disks, first much longer 

 than second; toes one-third webbed with well-formed disks, third slightly 

 shorter than fifth; a single metatarsal tubercle; a small dermal heel flap; 

 the hind leg being carried forward along the body, the tibio-tarsal articu- 

 lation extends forward to between the eye and tip of the snout; skin on 

 top of head involved in the cranial ossification, finely granular; skin on 

 back smooth, on throat and chest smooth with scattered tubercles; belly 

 granular with the tubercles more closely set. Color (in alcohol) brown- 

 ish drab above, without any distinct pattern of darker markings; a 

 narrow whitish ring around the eye, and a similar line along the upper 

 lip, more or less interrupted by brown ; legs indistinctly cross-barred ; 

 the posterior aspect of the femur with indistinct white spots, behind 

 which a dark brown line; underside whitish with indistinct brownish 

 marblings; a dark brownish line on the inner side of the arm. 



Dimensions. 



mm. 



Tip of snout to vent 60 



Tip of snout to nostrils 6 



Tip of snout to anterior rim of orbit 13 



Tip of snout to posterior edge of tympanum .... 28 



Tip of snout to tip of occipital horn 33 



Distance between tips of occipital horns 27 



Distance between nostrils 3.5 



Distance of nostrils from orbit 7 



Interorbital width 12 



Width of upper eyelid 6 



Greatest width of head 32 



Forelegs from axilla 40 



Hind legs from vent to tip of longest toe 99 



Tibia 33 



Remarks. — This species appears closely allied to Cerathyla bubalus 



