478 PROCEEDINGS' OF THE NATIONAL MUSEUM vol. loi 



Color imiform dark brownish black dorsally; tail marbled with 

 brownish purple on a light tan background; abdomen smooth, light 

 yellow-tan. 



HYLA? SP 



Figure 92, d 



San Lucas Camotlan, Oaxaca, 29 tadpoles unnumbered except for 

 field tags (part of F 15). Caught in the river in the flats below the 

 town, on May 6, 1946. 



A somewhat oval body shape with long, tapering, laterally grooved 

 tail ; tail fin originating well posterior on dorsum just anterior to verti- 

 cal plane of insertion of hind legs and terminating in a point; spiracle 

 sinistral, eyes situated more dorsally than laterally ; no lateral emargi- 

 nation of papillae; latter complete around lower labium, in only one 

 row; papillary border barely overlapping outer edge of upper row 

 of labial teeth ; labial teeth in five well-developed rows with one and 

 usually two tiny auxiliary rows on each side ; outermost row of teeth 

 complete above horny beak ; second row slightly separated and remain- 

 ing rows strongly separated by width of upper beak ; three lower rows 

 of labial teeth, the innermost row divided medially ; upper horny beak 

 only half or slightly more than half width of outermost upper row of 

 labial teeth ; both beaks serrate with lower deeply notched anteriorly. 



Color dark brown doi'sally, mottled with lighter brown on upper- 

 most half of tail ; dark color actually giving way to dark brown spots 

 on a tan ground color as tail is approached ; ventrally the tan giving 

 way to yellow; tail fin speckled with brownish black dots; total 

 lengths varying from 31 to 74 mm. 



As the smaller specimens appear to have differently shaped horny 

 beaks, they were at first separated on this basis and on the basis of 

 size. However, intermediate-sized specimens possess beaks intermedi- 

 ate in nature. 



Tlie river where the tadpoles were caught was swift flowing and had 

 a stony bottom with sandy patches. 



Genus Rana Linnaeus 



RANA PIPIENS AUSTRICOLA Cope 



Figure 92, e 



R. [ana'\ h.[alecina~i austricola Cope, Proc. Amer. Philos. Soc, vol. 23, p. 517, 



1886. 

 Rana pipiens austricola Smith, Journ. Washington Acad. Sci., vol. 37, p. 409, 



1947. 



U.S.N.M. No. 123697, from San Lucas Camotlan, Oaxaca. "Large 

 greenish frog — caught in the river in the east edge of the village at 

 about 6 : 30 p. m." 



