MEXICAN TAILLESS AMPHIBIANS 155 



pustules on exposed surfaces of fore and hind limbs; skin of 

 gular region, abdomen, and under surface of thighs coarsely 

 granulated; male with two large external vocal vesicles behind 

 angle of mouth; head-and-body length, 40 to 64 mm_..venulo8a (p. 176) 

 Coloration of upperparts vinaceous-drab, with coarse network 

 of dark purplish reticulations; tibia with a number of cross 

 lines of same color; lower surfaces uniform white; transverse 

 diameter of tympanum one-third the diameter of the eye, 

 and overhung by a dermal fold: vomerine teeth in two small 

 clusters on a level with posterior edge of the choanae, each 

 group consisting of about four teeth, and the interval between 

 the clusters about equivalent to their diameter; fingers one- 

 fourth webbed; no projecting rudiment of pollex; adhesive 

 disks as large as tympanum; the hind limb being carried 

 forward along the body, the tibio-tarsal joint reaches to 

 between eye and tip of snout; toes three-fourths webbed, the 

 membrane reaching to the adhesive disks of the third and 

 fifth toes, leaving free the penultimate phalanx of the fourth; 

 tarsal fold absent or indistinct; tongue nearly circular, scarcely 

 notched behind; canthus rostralis rounded; loreal region 

 oblique, concave; skin of upperparts finely shagreened, with 

 scattered indistinct warts; gular region smooth; rest of 

 underparts coarsely granulated; a dermal fold across chest; 

 head-and-body length, 28.5 mm phlebodes (p. 172) 



10. Tympanum not more than one-half diameter of eye 11 



Tympanum two-thirds to three-fourths diameter of eye, over- 

 hung by dermal fold; fronto-parietal bone often not in con- 

 tact medially, leaving large fontanelle; fingers from one-fourth 



to one-third webbed (fig. 19, e) ; adhesive disks of fingers not 

 noticeably larger than those of the toes, but smaller than tym- 

 panum; the hind limb being carried forward along the body, 

 the tibio-tarsal joint reaches to the eye, or between the eye and 

 tip of the snout; toes three-fourths webbed (fig. 20, c), the 

 membrane reaching the disks of the third and fifth, leaving 

 free the last phalanx of the fourth; a distinct tarsal fold; 

 tongue circular, usually notched behind; canthus rostralis 

 angular; loreal region concave; skin of upperparts smooth or 

 finely shagreened; underparts, including gular region and 

 underside of thighs, granulated; upperparts sometimes 

 uniform green, olive, or grayish, but generally brownish or 

 greenish, with subsynimetrical markings of dark brown or 

 dark green on back and crown of head; a dark band com- 

 mences at tip of snout and extends backward below canthus 

 rostralis through eye and tympanum, ending in a black spot 

 behind fore limb; a vertical dark band below eye separating 

 two large white spots on labial border of upper jaw; sides 

 marbled with dark brown and black; fore and hind limbs with 

 more or less distinct dark crossbars; lower surfaces whitish, 

 immaculate; male with two large external vocal sacs behind 

 angle of mouth; head-and-body length, 55 to 73 mm baudinii (p. 160) 



11. Adhesive disks of fingers not noticeably larger than those of 



toes, but as large as or larger than tympanum; vomerine 

 teeth in two elongate clusters between the choanae, present- 

 ing an obtuse angle medialh' and posteriorly, but their 

 hinder ends do not quite reach the level of posterior margins 



