400 



Hyla colymba, sp. nov. 



Hyla albomarginata Dunn 1924, Occas. Papers Univ. Michigan Mus. Zool. 

 151, p. 3. 



Type.—M. C. Z. no. 10234, collected by Chester Duryea and E. R. Dunn, 

 1923. 



Type locality. — La Loma (or Buenavista) on trail from Chiriqui Lagoon to 

 Boquete, about 1500 feet altitude. 



Diagnosis. — A small Hyla of the albomarginata group; differing in smaller 

 size; smaller tympanum; no pollicial spur; less web; smaller disks; and in the 

 presence of a fringe on last phalanx of fingers and toes, which is beyond the 

 web, and wider than the disks. 



Description.- — Tongue circular; head a pointed oval; snout blunt; vomerine 

 teeth in two arcuate groups between the nares; canthus rostralis rounded; 

 lores sloping; interorbital space much wider than upper eyelid; eye less than 

 its distance from snout, greater than its distance from the nostril; tympanum 

 l /i eye, half covered by supra tympanic fold which reaches elbow; smooth above, 

 belly and underside of thigh granular; a gular vocal sac; no chest fold; no 

 heel flap; palms granular; fingers III-IV % webbed, III— II the web reaches 

 x /i on III and 3^ on II, II— I rudimentary; toes a phalanx of IV and disk free, 

 not to disks of III and V, II— III a phalanx and disk free; II— I rudimentary; 

 disks smaller than width of digits, the same size as tympanum; fingers and 

 toes with a fringe wider than disks on last phalanx; heel to snout; heels meeting 

 when appressed; color in life brownish green; in preservative pale, with more 

 or less expanded chromatophores and whitish points; length 32 mm. 



Variation. — Another adult varies only in degree of expansion 

 of the chromatophores; a young specimen (22 mm.) has a rudi- 

 mentary tail and less web. It was, in life, bright green with tiny 

 dark dots, and a white line from the eye over the tympanum. 

 M. C. Z. no. 10232-3, 10235-43, frogs and tadpoles, are para- 

 types. 



Remarks. — There is no doubt that this form is distinct from 

 either Barro Colorado Island or Brazilian albomarginata, with 

 both of which I have compared it. The differences are not 

 obvious at first sight, and my recognition of this form as distinct 

 has arisen from the striking color differences observed in Barro 

 Colorado specimens (webs red, red on concealed surfaces of 

 thigh); on the differences in the calls of the two (a metallic 

 'cheep' in the new form, an explosive 'bop' in Barro Colorado 

 Island); a note from Dr. Adolpho Lutz, suggesting that the 

 Brazilian albomarginata has very different tadpoles from the La 

 Loma form as described by me in 1924. 



The differences - mentioned in the diagnosis hold for both 



