FROGS OF COLOMBIA — COCHRAN AND GOIN 299 



on top of the head from the eyes to the nostrils is a creamy white. 

 This light patch is missing in one specimen. A line of similar color 

 extends from behind the eye to about midbody, passing above the 

 tympanum and axilla. In all except two of the Leticia specimens 

 there are two small spots in the sacral region. In the two that do 

 not show this condition, the spots are fused into a dumb-bell shaped 

 figure in one and are not visible at all in the other. There is a definitive 

 spot just above the vent in some specimens, and an aggregation of 

 creamy white flecks in the same position in others. A band of creamy 

 white crosses the shank, and patches of similar color occur on the 

 heel and elbow in all the individuals. 



Remarks. — Although obviously related to both H. leucophyllata 

 and H. rossalleni, this species is just as obviously distinct from both. 

 While about the same size as leucophyllata it differs in its more marked 

 sexual dimorphism, in lacking definitive vomerine teeth, and in 

 pattern. In the latter the creamy white markings are so extensive on 

 the dorsum that the impression is given of a light frog with dark 

 markings. In H. sarayacuensis the opposite impression is gained, that 

 is, of a dark frog with light markings. Furthermore, sarayacuensis never 

 seems to have the large, white, silvery daub on the dorsal surface of 

 the shank that is so characteristic of leucophyllata. 



H. sarayacuensis differs from H. rossalleni in being much larger in 

 size, in having a white, triangular spot on top of the head and snout, 

 in having the dorsolateral stripes more or less complete, and in 

 lacking the bright, silvery white supraocular spots. 



All of the Leticia specimens of H. sarayacuensis were collected on 

 vegetation in a wet meadow, generally a foot or more above the 

 ground. They were all taken on a single night, and though the same 

 and similar-appearing habitats were worked on other occasions and 

 under seemingly similar conditions, no additional specimens were 

 seen. Three pairs were found in amplexus, each pair on the large leaves 

 of an aroid (Araceae) plant. 



Specimens Examined 

 COLOMBIA r 



Amazonas: Leticia, UF 8521 (9). 



Vatjpes: Gino-Goj'6, lower Rio Apaporis, MCZ 28047. 



ECUADOR: Napo-Pastaza: Sarayacu, MCZ 19729 (type of sarayacuensis); 



MCZ 19730 (paratype of sarayacuensis) ; EPN 2975-6, 2979; Rio Puyo at 



Puyo, JAP 2009; 6 km. south-southeast of Puyo, JAP 2055. 



Hyla rossalleni Goin 



Figure 33 



1957. Hyla alleni Goin, p. 60 (type locality, Leticia, Amazonas, Colombia). — 

 Goin and Layne, 1958, p. 106. — Gorham, 1963, p. 21. 



1959. Hyla rossalleni Goin, 1959b, p. 340 (substitute name for H. alleni, pre- 

 occupied). 



