MEXICAN TAILLESS AMPHIBIANS 125 



placed at right angles to the long axis of the body, the heels 

 touch but do not overlap; upperparts dark mulberry brown, 

 dotted with moderately large gray spots (yellow in life) ; lores 

 and upper lip black; underparts pale pinkish brown, without 



markings; head-and-body length, 24 mm lepras (p. 128) 



Areolate skin on hinder half of abdomen; tympanic membrane 

 more than one-third but less than one-half the diameter of the 

 eye; canthal region rounded, with no discernible ridge, loreal 

 region sub vertical; head fiat above; maximum width of up- 

 per eyelid one-half to two-thirds the width of interorbital 

 region; external nares small, rather widely separated, and their 

 distance from the eye slightly less than diameter of the latter; 

 tongue subpyriform; skin of upperparts and sides apparently 

 smooth, but actually areolated as seen under the lens; 

 areolation on lower half of sides visible without aid of lens; 

 skin of underparts smooth, except posterior half of abdomen, 

 which is areolated; inferior surfaces of thighs coarsely gran- 

 ular; fingers free, without vestige of membrane at base; first 

 finger shorter than second; large subarticular or supernum- 

 erary tubercles continued backward on metacarpals; a large 

 palmar callosity; apical disks slightly wider than finger, 

 truncated at extremity, and apparently flattened; toes with 

 slight vestige of web at base; free portion of fourth toe twice 

 as long as free portion of fifth; subarticular or supernumerary 

 tubercles especially large at ends of metapodial bones; plantar 

 surface of foot covered with numerous minute tubercles; 

 inner metatarsal tubercle larger than outer; no tarsal fold; 

 apical disks of toes smaller than those of fingers; the hind 

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

 joint reaches to posterior edge or to middle of eye; the hind 

 limbs being placed at right angles to the long axis of the body, 

 the heels overlap slightly; upperparts (in alcohol) ranging 

 from dark vinaceous-drab to brownish drab, marked with 

 numerous blue-black spots without sharply defined borders, 

 but tending to merge with ground color of upperparts; a 

 blue-black mark curving from above downward behind tym- 

 panum; fore and hind limbs with dark cross bands; external 

 digit of hand and foot with faint cross bands; upper and 

 posterior surfaces of femur with white or light-colored spots 

 on a darker ground color; edge of upper lip with a few light 

 splotches; darker streak along canthal region from external 

 narial opening to eye; ground color much lighter on sides, 

 with distinct light spots; inferior surfaces light colored, un- 

 spotted; head-and-body length, 22 mm guttilatus (p. 127) 



Skin of upperparts distinctly roughened, with wartlike tuber- 

 cles; sides areolated; tympanum very distinct, in diameter 

 equal to one-half to two-thirds of that of eye; canthal region 

 rounded, no discernible ridge; loreal region vertical; snout 

 a little longer than diameter of eye; skin on throat and breast 

 smooth; hinderpart of belly areolated; underside of thighs 

 closely granulated; first finger shorter than second, fourth a 

 little longer than second; distinct subarticular tubercles; 

 apical disks moderately large, but those of two outer fingers 

 appreciably larger than the tolerably small disks of the toes; 



66785—32 9 



