MEXICAN TAILLESS AMPHIBIANS 151 



Vomerine teeth behind or barely at level of posterior edge of 

 choanae, each group consisting of about eight teeth; body with 

 lateral color band; fronto-parietal bones ossified and in con- 

 tact anteriorly, separated posteriorly, leaving a fontanelle; 

 tympanum about two-fifths diameter of eye; adhesive disks 

 nearly as large as tympanum; the hind limb being carried 

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

 posterior portion of the orbit; tongue wide, not or scarcely 

 notched behind; canthus rostralis indistinct; loreal region 

 concave, obhque; skin of upperparts thickened, studded on 

 back with large obtuse warts; upperparts Ught purplish 

 brown, separated from sides in some specimens by a broad 

 blackish band, which extends from above tympanum to loin; 

 pupil cruciform, interspaces golden, black spot on outer 



margin venulosa, young [ = spilomma Cope] (p. 17b) 



Vomerine'teeth at level of posterior edge of choanae, each group 

 consisting of four teeth; body without lateral longitudmal 

 color band; tympanum one-third diameter of eye, overhung 

 by thick dermal fold; frontal bones cartilaginous, thickened 

 or stiffened in front, possibly ossified; fingers united at base 

 by vestigial web; thumb of male with two corneous callosi- 

 ties on inner surface during breeding period; toes webbed 

 for two-thirds of their length, the membrane being deeply 

 incised and continued beyond the bases of the penultimate 

 phalanges of the third to fifth toes as a narrow fringe; foot 

 shorter than combined length of tibia and femur; tarsal fold 

 indistinct; adhesive disks of approximately the same size as 

 tympanum: the hind limb being carried forward along the 

 body, the tibio-tarsal joint reaches the anterior margin of eye; 

 tongue broad, oval, not notched behind; canthus rostralis 

 rounded; skin of upperparts smooth; underparts granulated; 

 a dermal fold across chest; coloration of upper surfaces, 

 including femur and humerus, dark bluish plumbeous (in 

 alcohol), without darker markings; sides with a network of 

 dark streaks on a yellow background; posterior face of thigh 

 brown, with few yellow specks along superior border; inferior 

 surfaces yellow; eye unspotted; head-and-body length, 43 5 



bistmcta (p. loo; 



1. VomTr'ine teeth'situated in transverse rows near level of anterior 

 margins of choanae; tympanum distinct, more than one-half 

 diameter of eye and overhung by a dermal fold; adhesive 

 disks small, less than one-half diameter of tympanum; fin- 

 gers free from web at base; first finger shorter than second; 

 toes webbed for one-half their length and membrane is con- 

 tinned as a narrow fringe on distal phalanges; an ovoidal 

 inner metatarsal tubercle and an indistinct outer one; no 

 supernumerary tubercles on plantar surface of foot; a tarsal 

 fold- the hind limb being carried forward along the body, the 

 tibio-tarsal joint reaches between eye and tip of snout; 

 tongue ovoidal, notched behind, and free on its posterior 

 one-third; canthus rostraUs angular; skin of upperparts 

 smooth; a very distinct dermal fold across chest; throat, 

 abdomen, and under surface of thighs granulated; coloration 

 of upperparts apparently green with indistinct spots of a 

 darker color; a narrow light-yellow stripe along canthus 



