HERPETOLOGICAL COLLECTION FROM MECJQCO — SHANNON 479 



Four tadpoles were procured from the same locality, which are here 

 interpreted as belonging to this species. Two of them (45 and 39 

 mm. total length) are badly dessicated. The larger of the other two 

 is 58 mm. in total length and 24 mm. in body length. The caudal 

 membrane starts anterior to the plane of insertion of the hind leg, 

 although on one specimen the ridge extends forward from this hypo- 

 thetical plane as far as the head; the membrane is large, translucent, 

 and tapers to a point. The eyes are in the lateral plane of the body, 

 although quite visible from above ; spiracle lateral, sinistral, pointing 

 up and back, situated closer to anus than snout : anus dextral. 



Lateral papillary border of buccal cavity eraarginate; upper papil- 

 lary border extending to a point medial to lateral edge of outer tooth 

 row; lower papillary border in a single row; three upper and three 

 lower rows of labial teeth as shown in figure 92, e ; upper beak serrate ; 

 lower beak slightly serrate. 



Color dark above, light below ; grayish fine mottling on caudal 

 membrane; intestinal spiral quite visible through abdominal wall. 



If the author is correct in assigning these specimens to austncola, 

 the third row of upper labial teeth becomes of possible taxonomic 



import. 



"This frog is called tuk in Mixe, a name apparently applied to all 

 frogs, although the tree inhabiters are considered by them to be toads 

 and not frogs." 



RANA PIPIENS TRILOBATA Mocquard 



Rana triloMta Mocquard, Bull. Soc. Philom. Paris, ser 9, vol. 1, p. 158, pi. 1, fig. 



1, 1899. (Jalisoo, Mexico.) 

 Rana pipiens trilobata Smith, Journ. Washington Acad. Sci., vol. 37, p. 409, 1947. 



U.S.N.M. Nos. 123577 to 123579, four specimens, from El Salto, 

 Durango, Ealph G. Miller collector. 



Smith (1947) revived the names cmstricola and trilohata for sub- 

 species of Rana pipiens from the southern Atlantic coastal areas and 

 the plateau of Mexico, respectively. His description, however, did 

 not include a diagnosis. As the two subspecies are strikingly dis- 

 tinct, the following tabulation is submitted for purposes of bringing 

 out this contrast. Reservations toward the data should be held be- 

 cause of the small number of specimens involved. 



trilohata austricola 



Posterior surface of thighs very gran- Posterior surface of thighs compara- 



^jI^j. tively smooth. 



Long, strong, raised dorsal glandular Glandular ridges low, pustules indis- 



ridges with prominent pustules be- tinct or absent 



tween them. 



Heels not or barely overlapping. Heels strongly overlapping 



Head slightly longer than wide. Head slightly wider than long. 



