MEXICAN TAILLESS AMPHIBIANS 191 



elliptic, feebly prominent, one-third or more the length of inner 

 toe; no outer metatarsal tubercle; subarticular tubercles large 

 and prominent; tips of fingers feebly swollen; first finger longer 

 than second; males with thick blackish pad on inner side of 

 first finger; no external vocal vesicles; vomerine teeth in two 

 small groups within and behind level of choanae; head broader 

 than long and much depressed; snout rounded, as long as 

 transverse diameter of eye, and barely projecting beyond 

 mouth; can thus rostralis indistinct; loreal region very oblique, 

 slightly concave; nostril equidistant from end of snout and from 

 eye; interorbital width equal to or a little less than that of 

 upper eyelid; head-and-body length of adults, 45 to 78 mm. 

 tarahumarae (p. 214) 



Tympanum very distinct, its transverse diameter nearly equal 

 to that of eye in females and greater than the latter in males; 

 upperparts brown or olive-brown, rarely green, uniform or 

 spotted, or marbled with dark brown; limbs with or without 

 dark cross bands; hinder side of thighs often marbled with 

 black and yellow; chin yellow; rest of underparts white, some- 

 times marbled with brown, or spotted with white and yellow; 

 skin of upperparts fairly smooth and leathery, with scattered 

 warts; a strong glandular fold from eye to shoulder, but no 

 dorso-lateral fold; sides often with pustulose warts; the hind 

 limb being carried forward along the body, the tibio-tarsal 

 joint reaches to eye or tympanum; no tarsal fold; distance from 

 snout to vent 2 to 2}^ times length of tibia; tips of toes slightly 

 swollen; toes fully webbed, with exception of distal joint of 

 fourth; outer metatarsals separated to base; inner metatarsal 

 tubercle elliptic, feebly prominent, one-third or more the 

 length of inner toe; noouter metatarsal tubercle; subarticular 

 tubercles small; tips of fingers pointed or obtuse; first finger 

 as long as or a little longer than second; males with retract- 

 ing pad on inner side of first finger; internal vocal vesicles 

 present; vomerine teeth in small clusters or short oblique rows 

 between or rarely behind level of choanae; head broader than 

 long and much depressed; snout rounded, as long as or a 

 little longer than transverse diameter of eye, and clearly 

 projecting beyond mouth; canthus rostralis indistinct; loreal 

 region very oblique, slightly concave; nostril equidistant from 

 end of snout and from eye, or a little nearer the former; inter- 

 orbital width varies from one-half to nearly once that of upper 

 eyelid; head-and-body length of adults, 100 to 200 mm.catesbeiana (p. 195) 



Ground color of upperparts as well as the dark spots stippled or 

 dotted with closely approximated minute white spots or specks; 

 underside of thighs occasionally reddish, but likewise covered 

 with small white dots; upperparts purplish brown or olive- 

 brown, uniform or speckled, vermiculated, or mottled with 

 lighter and darker, with or without large rounded or elongated 

 ocellated dark brown spots, which may be grass green in life and 

 are often light edged or encircled with ring of white dots; 

 tympanum occasionally stippled with white specks; limbs with 

 or without dark cross bands; underparts grayish white, ash, 

 dirty yellow, or brownish, conspicuously spotted, blotched, or 

 vermiculated with spots and sinuations of white; anterior, pos- 

 terior, and inferior surfaces of thighs marked with numerous 



