196 U.S. NATIONAL MUSEUM BULLETIN 2 88 



PANAMA: Summit, Canal Zone, MCZ 17971; Las Sabanas, MCZ 17582-3. 

 SURINAM: Zanderij, CJG 2402-7. 

 TRINIDAD: MCZ 2204. 



VENEZUELA: Falcon, Acosta District: Panji, MCZ 25978-3; Recito, MCZ 

 26142. Merida, MCZ 2525. Paria Peninsula, Guiria, MCZ 23024-8. 



3. maxima group 



A group of large frogs generally brownish in color, with moderately 

 to fully webbed fingers, with or without reticulations on the palpebral 

 membranes or dermal heel appendages. In addition to the species 

 recorded from Colombia {maxima and rosenbergi) such forms as faber 

 and partialis are members of this group. 



The two species known from Colombia may be distinguished by 

 the following key: 



a 1 . Palpebral membranes reticulate, a triangular dermal appendage on heel, 

 webs of hands and feet dusky H. maxima 



a 2 . Palpebral membrane not reticulate, no dermal appendage on heel, webbing 

 on hands and feet clear H. rosenbergi 



Hyla rosenbergi Boulenger 



Plate 26d-f 



1898. Hyla rosenbergi Boulenger, 1898a, p. 123 (type locality, Cachabi, Es- 

 meraldas, Ecuador).— Noble, 1925, p. 10; 1927, p. 97; 1931, pp. 68, 

 104— Breder, 1925, p. 329; 1927, p. 73; 1946, p. 409.— Nieden, 1926, 

 p. 264.— Liu, 1935, p. 35.— Netting, 1935, p. 15.— Thornton, 1964, 

 p. 188. 



Diagnosis. — A large Hyla with fingers rather fully webbed; closely 

 allied to H. maxima. 



This species can be distinguished from H. maxima by the absence of 

 dermal heel appendages and reticulations on the palpebral membranes 

 and by having the webs between the fingers and toes pale rather than 

 dusky. From H. faber it differs in having the fingers fully webbed 

 rather than having the webbing reduced. Young specimens of maxima 

 might be confused with H. crepitans, but maxima likewise differs from 

 crepitans in having the fingers nearly fully webbed. 



Description. — CNHM 61167, from upper Rio Sinu, Socarre, C6r- 

 doba, Colombia. Vomerine teeth in two heavy /"\ series, lying close 

 together between the large elongate choanae (in this specimen the 

 posterior ramus of the right vomerine patch is missing) ; tongue three- 

 fourths as wide as mouth opening, broadly cordiform, its posterior 

 border very slightly free and truncate but unnotched. Snout large, 

 U-shaped when viewed from above, nearly truncate in profile, the 

 upper jaw extending but little beyond lower; nostrils more lateral 

 than superior, considerably projecting, their distance from end of 



