CHECKLIST OF THE AMPHIBIA OF MEXICO 81 



27. No trace of a tarsal fold, or a ridge, or row of tubercles under forearm; 



no canthus; tympanum nearly one-half eye diameter; heel to eye; vocal 



sac present; 30 mm .__ _ stauflferi (p. 88) 



A tarsal fold 28 



28. No supernumerary tubercles on foot; vomerine teeth at anterior level of 



choanae; heel to between eye and tip of snout; canthus angular; 



tongue one-third free; 37 mm _. plicata (p. 88) 



Some supernumerary tubercles on foot; vomerine teeth at posterior level 

 of choanae; skin strongly pustular; canthus absent; tongue one-fourth 

 free behind; toes about half webbed; 45 mm arenicolor (p. 89) 



29. No trace of tarsal fold; no, or only an indistinct trace of a row of tubercles 



(or fold) under forearm; eye red in life; heel to a point between eye 

 and nostril; lip with a narrow cream line or elongate white spots; 

 tympanum one-third or less diameter of eye; 26 mm_ _ erythromma (p. 89) 

 A distinct tarsal fold 30 



30. Very light colored pigment in delicate scattered flecks, not starshaped; 



bodies flattened; tympani directed rather upward; row of tubercles 



under forearm more or less distinct (bromeliad frogs) 31 



Darker, heavier pigmentation; brownish, gray, olive, or green, with or 

 without dorsal dark spots 32 



31. Heel to eye; toes two-thirds or more webbed; tympanum about one-half 



eye; fingers one-third webbed; eyelid two-thirds of interorbital width; 



head as wide as body; 30 mm melanomma (p. 89) 



Heel to point between eye and nostril; toes about four-fifths webbed; 

 fingers one-half webbed; tympanum slightly more than one-third eye; 

 head broader than body; 35 mm dendroscarta (p. 89) 



32. Legs and arms distinctly barred; head wider than body 33 



Legs not barred with darker color; olive or green in life 34 



33. Heel to middle of eye; finger disks nearly as large as tympanum; tym- 



panum equal to or slightly more than half of eye; a tarsal fold; canthus 

 rostralis rounded; chin spotted; no dorsal spots; (? no vocal sac); 30 



mm taeniopus (p. 89) 



No vocal sac; sharp distinct tarsal fold; snout very truncate; canthus 

 distinct; skin relatively smooth, but minutely corrugated; heel to a 

 point in front of eye; finger disks distinctly larger than tympanum; 

 tympanum distinctly less than half eye; distinct dorsal spots; chin 

 spotted; 30 mm bromeliana (p. 90) 



34. Anal flap elongated; the opening near level of under surface of femur; 



white stripe above anus; two conspicuous white-topped tubercles, on 

 each side of lower part of anus; rov/ of distinct white tubercles under 

 forearm; a strong tarsal fold, thickest posteriorly; few fight flecks on 

 sides; a white line or series of white flecks on posterior edge of tarsus, 



35 mm hazelae (p. 90) 



Anal flap short; opening near middle or upper level of femora 35 



35. Enlarged tubercles at lower level of anus; teeth browTiish; more or less of 



a skinfold in groin; choanae circular; vomerine teeth small; anal tuber- 

 cles white; a white transverse stripe above anus; deep green to yellow 



green in life; bromeliad frog; 24 mm smaragdina (p. 90) 



No conspicuously enlarged tubercles in anal region 36 



