MEXICAN TAILLESS AMPHIBIANS 169 



somewhat oblique or transverse rows between the choanae, and 

 separated medially by a short interval; tongue large, broad, and 

 feebly notched behind; snout broad, rounded; canthus rostralis 

 distinct; loreal region sloping more or less obliquely; distance between 

 anterior edge of eye and narial opening greater than, equal to, or 

 somewhat less than, transverse diameter of eye; interorbital space 

 somewhat wider than upper eyelid; pupil oval, broader than high; 

 iris dark yellow, spotted with bronze, and without cross line; greatest 

 diameter of tympanum equal to two- thirds to three-fourths the trans- 

 verse diameter of eye; fingers united at base by dermal fringe or 

 vestigial web; first finger shorter than second; adhesive disks of 

 fingers somewhat larger than those of toes and about one-half as 

 large as tympanum; toes two-thirds webbed; tarsal fold weakly or 

 strongly developed; inner metatarsal tubercle distinct, egg-shaped, 

 and about as long as first joint of first toe; outer metatarsal tubercle 

 small and conical, or flat, or absent; subarticular tubercles distinct; 

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

 joint reaches to or slightly beyond tip of snout; the heels touch or 

 overlap when the hind limbs are brought together at right angles to 

 long axis of body; a discoidal dermal fold across chest; a dermal fold 

 extends above and downward behind tympanum to axilla; 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; upper lip with dark gray stripe, edged above, 

 or above and below with white; loreal stripe blacldsh, edged above 

 with white, bronze, or light brown; from eye to tympanum and behind 

 tympanum a dark lateral streak of regular or irregular wid th extends 

 backward to about halfway length of body, where it either disappears 

 or is broken up on hinder half of flank into a series of spots; green of 

 flanks not so sharply contrasted with whitish underparts; inguinal 

 region either whitish or udth bluish tinge; anterior surface of thigh 

 whitish or bluish; hinder surface of thigh always without darker 

 markings, with the flesh color showing through the bluish tinge: 

 outer edge of tibia and tarsus with lengthwise light-edged dark streaks; 

 cross bands on limbs indistinct, or incomplete (small spots), or well 

 developed; a dark spot on inner side of upper arm; underparts whitish, 

 without darker markings; throat of female white, of males either 

 uniformly light gray or else rather dark greenish gray, and occasionally 

 spotted; region of vent rather dark or intense gray; head-and-body 

 length of males, 35 to 38 mm., of females, 37.8 to 50 mm.; greatest 

 diameter of tympanum of males, 2.2 to 2.5 mm., of females, 2.1 to 

 2.7 mm.; transverse diameter of eye of males, 3.2 to 3.7 mm., of 

 females, 3.4 to 3.8 mm.; w^dth of head of males, 12.6 to 13 mm., of 

 females, 13 to 15.5 mm. 



