CHECKLIST OF THE SNAKES OF MEXICO 99 



through Kinney and Del Rio counties), southward to the valley of 

 the Rio Grande," including northern Coahuila (known in Mexico only 

 from a few localities in Coahuila). 



Genus NINIA Baird and Girard 



Vinia Baird and Girard, Catalogue of North American reptiles, 1S53, p. 49. — 

 Dunn, Proc. Nat. Acad. Sci., sol. 21, 1935, pp. 9-12 (generic synopsis). 



Streptophorus Dumeril, Bibron, and Dumeril, Erpetologie g^n^rale, vol. 7, pt. 1, 

 1854, pp. 514-515 (tj'pe, S. bifasciatus Dumeril, Bibron, and Dumeril). 



Genotype. — Ninia diademata Baird and Girard. 



Range. — Trinidad, Venezuela, Colombia, and Ecuador north 

 through Central America to southern Oaxaca on the Pacific and 

 Hidalgo on the Atlantic. 



Species. — Four forms occur in Mexico. Seven distinct species are 

 recognized, and one other {pavimentatus Bocourt, Guatemala) may 

 be valid. Two species {sehae and diademata) are comprised of two 

 subspecies each. 



KEY TO MEXICAN FORMS OP NINIA 



1. Black above, except nuchal collar ; usually six supralabials 2 



Bed above, with or without black cross bars, a yellow collar followed by 



a black one; usually seven supralabials 3 



2. Ventrals 123 to 125 (in two specimens) diademata plorator 



Ventrals 136 to 159 diademata diademata 



3. Caudals in males usually less than 54 (44 to 54), in females usually less 



than 45 (38 to 46) ; ventrals in males usually more than 140 (137 to 



147), in females u.sually more than 145 (143 to 159) sebae morleyi 



Caudals in males usually more than 54 (51 to 71), in females usually more 

 than 45 (40 to 60) ; ventrals in males usually less than 140 (132 to 145), 

 in females usually less than 145 (138 to 154) sebae sebae 



NINIA DIADEMATA DIADEMATA Baird and Girard 



Ninia diademata Baird and Girard, Catalogue of North American reptiles, 1853, 



pp. 49-50.— Dunn, Proc. Nat. Acad. Sci., vol. 21, 1935, p. 12. 

 Niyiia diademata diademata Amaral, Mem. Inst. Butantan, vol. 4, 1929, p. 151. — 



Smith, Copeia, 1942, pp. 153-154; Proc. U. S. Nat. Mus., vol. 93, 1943, pp. 



45.5-456. 

 Streptophorus bifasciatus Dumeril, Bibron, and Dumeril, Erpetologie generale, 



Fol. 7, pt. 1, 1854, p. 520 (type locality Mexico; type in Mus. Hist. Nat. 



Paris). — BocouKT, Mission scientifique au Mesique et dans I'Amerique cen- 



trale, Kept., livr. 9, 1SS3, pp. 545^546, pi. 32, fig. 10. 



Type.— U.S.'N.M. No. 12122. 



Type locality. — Orizaba, Veracruz. 



Range. — Central Veracruz to northern Honduras, avoiding most of 

 the Yucatan Peninsula (recorded from several localities in the states 

 of Oaxaca, Tabasco, and Veracruz). 



