142 BULLETIN 187, UNITED STATES NATIONAL MUSEUM 



TANTILLA YAQUIA Smith 



Tantilla yaquia Smith, Zoologica, vol. 27, 1942, p. 41. 



Type.—Mus. Comp. Zool. No. 43274. 



Type locality. — Guasaremos, Rio Mayo, Chihuahua. 



Range. — Known only from the type locality. 



Genus TANTILLITA Smith 



Tantillita Smith, Journ. Washington Acad. Sci., vol. 31, 1941, p. 117. 



Genotype. — Tantilla lintoni Smith. 

 Range. — Chiapas and Guatemala. 

 Species. — Two. 



KEY TO SPECIES OF TANTILLITA 



1. Subcaudals 28 to 31; some evidence of a nuchal collar usually 



present brevissima 



Subcaudals 47 ; color uniform gray-brown above lintoni 



TANTILLITA BREVISSIMA (Taylor) 



Tantilla brevissima Tatlok, Trans. Kansas Acad. Sci., vol. 39, 1936 (1937), pp. 



344-345, fig. 4. 

 Tantillita brevissima Smith, Journ. Washington Acad. Sci., vol. 31, 1941, p. 117. 



Type.—E. H. Taylor-H. M. Smith Coll. No. 4557. 



Type locality. — Tonala, Chiapas. 



Range. — Known only from the type locality. 



♦TANTILLITA LINTONI (Smith) 



Tantilla lintoni Smith, Proc. Biol. Soc. Washington, vol. 53, 1940, pp. 61-62, fig. 1. 

 Tantillita lintoni Smith, Journ. Washington Acad. Sci., vol. 31, no. 3, 1941, p. 117. 



Type.—U.S.l^.M. No. 108603. 

 Type locality. — Pieclras Negras, Guatemala. 



Range. — Atlantic foothills of Guatemala and undoubtedly of Chia- 

 pas (known only from the type locality). 



Genus TOLUCA Kennicott 



Toluca Kennicott, in Baird, Report on the United States and Mexican boundary 

 survey, vol. 2, 1859, Kept., pp. 23-24. — Taylor and Smith, Univ. Kansas Sci. 

 Bull., vol. 28, 1942, pp. 338-340, figs. 4, 12 (map), pi. 30, fig. 1, pi. 35, fig. 1. 



Oxyrhina Jan, Arch. Zool. Anat. Fis., vol. 2, 1862, p. 59 (type, O. varians Jan). 



Achirhina Jan, Hid., p. 61 (type, A. defiUppii Jan). 



Ogmius Cope, Proc. Amer. Philos. Soc, vol. 11, 1869, p. 162 (type, 0. variaris Jan). 



Genotype. — Toluca Uneafa Kennicott. 



Range. — The southern part of the Mexican Plateau, from Jalisco 

 to Veracruz and southward in the central Oaxaca highlands and the 

 Sierra Madre del Sur of central Guerrero. 



/Species. — Three species, one with four races, are recognized at 

 present. 



