MEXICAN TAILLESS AMPHIBIANS 153 



black specks; rest of underparts pale yellow or white; males 

 with external gular sac; head-and-body length, 30 to 43 mm. 

 -- arenicolor (p. 156) 



Skin of upperparts smooth, rarely sprinkled with minute 

 tubercles; side of head and fore part of body with a longi- 

 tudinal dark-colored streak 7 



Dark markings on the greenish upperparts run more to longi- 

 tudinal dark streaks than to distinct dorsal spots; hinder 

 surface of thigh occasionally exhibits a distinct color pattern 

 consisting of a darker area more or less marbled or spotted 

 with yellow, and often with light upper edge; coloration of 

 upperparts greenish or brownish (bluish in alcohol) , with few 

 or numerous blackish, and often light-edged, elongate spots; 

 a black or brown band, narrow anteriorly and broad poste- 

 riorly, with white dorsal edge, commences at nostril and 

 extends backward below canthus rostralis to eye, and from 

 posterior edge of upper eyelid through tympanum and along 

 side to about level of middle of sacrum, where it is interrupted 

 or disappears entirely; horn-colored margins of upper and 

 lower lips merging posteriorly into broad band of same color 

 which terminates on fore limb; normal specimens have a 

 white or light-colored infraorbital stripe from end of snout 

 to axilla; a pair of elongate dark spots or streaks in sacral 

 region ; paired longitudinal dark streaks or sublinear arrange- 

 ment of dark spots on back; dark spot on each upper eyelid; 

 dark spots often present on each side of vent; upper surfaces 

 of hind limbs with dark spots or complete crossbars; a 

 light-edged dark streak along outer surface of tibia may or 

 may not be present; underparts and concealed surfaces of 

 limbs light colored; fingers practically free from web at base; 

 toes one-half to two-thirds webbed, the membrane not reach- 

 ing to adhesive disks of third and fifth; a tarsal fold; adhesive 

 disks generally smaller and rarely as large as the tympanum; 

 the hind limb being carried forward along the body, the 

 tibio-tarsal joint generally does not reach beyond anterior 

 margin of eye; vomerine teeth in two elongate clusters 

 between the choanae, occasionally in two slightly arched or 

 oblique rows, and each group consisting of three to seven 

 teeth; tympanum usuallj'^ one-half transverse diameter of eye, 

 overhung by a weak dermal fold; tongue pyriform or circular, 

 notched behind; canthus rostralis fairly distinct; loreal region 

 concave, oblique; gular region, abdomen, and under surface 

 of thighs coarsely granulated; a dermal fold across chest; 

 males with single external gular sac; head-and-body length, 

 25 to 41 mm ezimia (p. 164) 



Dark markings on greenish upperparts tend to be restricted to 

 distinct spots on hinder half of body; hinder surface of thigh 

 unmarbled and without color pattern, the dark flesh colgr 

 showing through a bluish suffusion; upperparts dark green, 

 grass green, olive green, or brownish in life (dirty blue in 

 alcohol) with paired oblong white-edged dark spots on 

 hinder back; sides of snout green; canthal stripe blackish, 

 edged above with white, bronze, or light brown; from eye to 

 tympanum and behind tympanum a dark lateral stripe of 

 regular or irregular width extends backward to about half- 



