HERPETO'LOGICAL COLLECTION FROM MEXICO' — SHAiNTSTON' 477 



plete rows of lower labial teeth with evidences of a fragile row 

 almost upon the papillary fringe; lower horny beak small and set 

 well posterior to the upper ; papillary fringe completely circumoral ; 

 several rows of papillae beneath lower edges of mouth, which gradu- 

 ally thin to one or two rows in the midline; one or two rows of 

 papillae on upper labium ; lateral papillary fringe well developed and 

 projecting downward. The general buccal proportions are shown 

 in figure 92, h. 



HYLA? sp. 



Figure 92, c 



Seven specimens, U.S.N.M. No. 123694, part of field No. F. I7a, 

 collected May 6, 1946, in a swift stream just outside San Lucas 

 Camotlan, Oaxaca, by W. S. Miller. 



The tadpoles vary from 37 to 47 mm. in total length, with tails 

 from 22 to 31 mm. long. One specimen (total length 43 mm., tail 

 length 26 mm.) is four-legged. 



Description of typical two-legged form. — ^Widest diameter of body 

 that between eyes; tail long and tapering with moderately well- 

 developed, colorless fringe, which starts from a point on a plane 

 transecting the body just anterior to the insertion of the posterior 

 extremities; arms fairly well developed (as in all specimens) ; spi- 

 racle sinistral, located just beneath flexure of left elbow; top of head 

 slightly rounded; snout sloping so abruptly downward at a 45° angle 

 from plane of top of head that a transverse fold is produced by this 

 angle; transverse fold located a little posterior to a point midway 

 between tip of snout and anterior corner of eye ; another fold or ridge 

 running from just dorsal to eye down to nostril, and from the nostril 

 to side of snout ; nostrils slightly closer to eyes than to tip of snout, 

 and separated by a distance equal to that from nostril to tip of snout. 



Upper labium extremely broad and pendulous, notched medially 

 and forming a flap covering mouth parts and extending down to 

 lower labium ; seven rows of upper labial teeth ; three uppermost rows 

 and, to a certain extent, fourth row thin and tending to pinch together 

 medially; six rows complete above horny beak; seventh row divided 

 medially and located at level of top of beak ; nine or ten rows of infra- 

 labial teeth, the inner six most strongly developed, and the last three 

 or four fine to point of extinction; papillary border completely cir- 

 cumoral, although papillae reduce to a single row over the dorsal 

 and ventral aspects of the labia. 



Web between third and fourth fingers small, not reaching subtermi- 

 nal joints except as a thin fringe along the fingers, is distinct but 

 slight between second and third fingers, faint between first and second 

 fingei-s. 



