MEXICAN TAILLESS AMPHIBIANS 187 



the Rio Grande. No intensive herpetological collecting has been 

 carried on in recent years in the States of Tamanlipas and Chihuahua. 

 Very little has been published in regard to the habits and hfe his- 

 tories of these httle narrow-mouthed toads. The Texan species are 

 known to hibernate in small groups under rotten logs and under piles 

 of rubbish. During the breeding season, it frequents pools of stag- 

 nant water and may be observed floating on the surface, if one 

 approaches quietly. Doctor Wright has published observations on 

 the eggs ^° and the tadpoles ^^ of two species found within the Umits of 

 the United States. 



GASTROPHRYNE ELEGANS (Boulenger) 



1882. Engystoma elegans Boulenger, Catalogue of the Batrachia Salientia s. 



Ecaudata in the collection of the British Museum, 2d edit., p. 162. — 



GtJNTHER, 1900, Biologia Centrali- Americana, Reptilia and Batrachia, p. 210, 



pi. 62, fig. D, Feb. 

 1910. Gastrophryne elegans Stejneger, Proc. Biol. Soc. Washington, vol. 23, 



p. 166, Dec. 29. 



Type locality. — Cordoba, State of Vera Cruz, Mexico. 



Range. — Not known to occur elsewhere than at the type locality. 



Remarks. — An adult female narrow-mouthed toad collected by 

 Auguste Salle at Cordoba in Vera Cruz and previously identified by 

 Giinther ^^ as Engystoma carolinense was found by Boulenger to lack 

 the outer metatarsal tubercle. This single character is the basis for 

 the recognition of this species. The type, so far as known, remains 

 unique. Not until a series of specimens from the type locality and 

 vicinity is available for study, will it be possible to determine whether 

 the outer metatarsal tubercle is normally absent in narrow-mouthed 

 toads of that region. 



Specimens examined. — None. 



GASTROPHRYNE USTA (Cope) 



1866. Engystoma ustum Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 18, p. 131, 

 May. — Brocchi, 1882, Mission scientifique au Mexique et dans I'Am^rique 

 Centrale, recherches zoologiques, pt. 3, sect. 2, p. 94, pi. 10, fig. 1. 



1869. Engystoma mexicanum Peters, Monatsber. k. preuss. Akad. Wiss. Berlin, 

 p. 881, Dec. (State of Puebla, probably Matamoros). 



1903. Eupemphix gadovii Boulenger, Ann. and Mag. Nat. Hist., ser. 7, vol. 12, 

 p. 552, Nov. (San Mateo del Mar, Tehuantepec) . 



1910. Gastrophryne usta Stejneger, Proc. Biol. Soc. Washington, vol. 23, p. 166, 

 Dec. 29. 



Type locality. — Guadalaxara [ = Guadalajara], State of Jalisco, 

 Mexico. 



'" Wright, A. H., and Wright, A. A., A key to the eggs of the Salientia east of the Mississippi River. 

 Amer. Nat., vol. 58, no. 657, p. 378, 1924. 



" Wright, A. H., Synopsis and description of North American tadpoles. Proc. U. S. Nat. Mus., vol. 74, 

 no. 2756, pp. 2, 3, 13-16; pi. 6, fig. 3; pi. 6, fig. 1, June 4, 1929. 



" Giinther, A. C. L. O., Catalogue of the Batrachia Salientia in the collection of the British Museum, 

 pp. 51, 52, 1858. 



