58 BULLETIN 194, UNITED STATES NATIONAL MUSEUM 



5. Heel to anterior edge of eye; disks of three outer fingers and toes rather 



strongly emarginated, usually a distinct inguinal black spot; usually 

 two or more dark diagonal spots or lines on sides, separated by cream 



lines; 32 mm spatulatus (p. 61) 



Heel to snout tip, or beyond 6 



6. Heel reaching much beyond tip of snout; dorsum light, sides darker; 



canthus rostralis distinct; a median elevated area on occiput and in- 

 terorbital region; toes less dilated at tip; emargination of outer digital 

 disks not pronounced; no diagonal lines on sides; tarsal fold indicated 



by one or two small tubercles; 25 mm decoratus (p. 61) 



Heel reaching tip of snout; gray markings on a lighter background; sides 

 not darker than dorsum; a symmetrical mark indicated on shoulders; 

 elevated area on head absent or faintly indicated; canthus rounded or 

 wanting; tarsal fold indicated by an elongate tubercle; 28.5 mm. 



hidalgoensis (p. 61) 



7. Toes short, hylalike, but without a cartilage between last two phalanges; 



a pair of narrow dorsolateral ridges; no large distinct black spots on 



back; 29 mm batrachylus (p. 61) 



Toes apparently longer, not especially hylalike; the disks less widened; 

 no dorsolateral ridges; a triangular mark on occiput; other dark marks 

 on back; 38 mm longipes (p. 61) 



8. No trace of an inner tarsal fold; vomerine teeth present but weak (or 



perhaps occasionally absent in mexicanus) 9 



A tarsal fold or tarsal tubercle present (absent or indistinct in matudai, in 

 which the edge of the tarsus is thickened but not elevated) 18 



9. An inguinal gland present, rather distinct; vocal sacs in males absent 



(except in occidentalis) ; toes very slightly dilated, disks with trans- 

 verse groove present or absent, visible if slightly dehydrated; super- 

 numerary tubercles absent on foot (except in occidentalis), but present, 



larger or smaller, on hand 10 



Vocal sacs present, the toes blunt, slightly swollen at tip; large super- 

 numerary tubercles present on soles and palms, 8 or 9 on former, 5 or 6 

 on latter; no inguinal gland evident; an intertympanic fold usually 

 present 13 



10. First finger longer than second; inner metatarsal tubercle compressed, 



very large, about equal to length of first toe; outer tubercle about 

 one-fifth of inner; some rather indistinct supernumerary tubercles on 

 sole; no outer palmar tubercle; vomerine teeth well developed; male 

 with vocal sac; gonadal membranes white; heel to nostril; heels over- 

 lap; 42 mm __ occidentalis (p. 62) 



First finger shorter than (rarely equal to) second; inner metatarsal 

 tubercle not compressed; vocal sac absent 11 



11. Heels not touching when legs are folded; heel to eye; inner metatarsal 



tubercle verj'- large, broad oval-conical, very little shorter than first toe; 

 outer tubercle one-fifth of inner; supernumerary tubercles obsolete on 

 sole, present on palm; small outer palmar tubercle present, touching 

 median; vomerine teeth small, weak; gonadal membranes white; skin 

 above minutely granular; abdomen coarsely granular; ventral disk not 

 reaching femur; no tubercles on outer part of tarsus; 42 mm. 



calcitrans (p. 62) 

 Heels overlapping when legs are folded; belly smooth 12 



