102 BULLETIN 18 7, UNITED STATES NATIONAL MUSEUM 



2. Body relatively thick, head less attenuated; two preoculars; first pair 



of infralabials longer than anterior chin shields, or subequal ; anterior 

 third of body with black transverse markings (conspicuous when skin is 



stretched) ; no trace of lines on belly potosiensis 



Body slenderer, head more attenuated ; one preocular ; first pair of infra- 

 labials shorter than anterior chin shields ; no cross bands on body 3 



3. Belly reddish in life, with a white line down middle and along ends 



of ventrals microphthalmus 



Belly gray or brown, not striped acuminatus 



OXYBELIS ACUMINATUS (Wied) 



Coluber acuminatus Wied, Abbildungen zur Naturgeschichte Brasilien, Lief. 14, 

 1822, pi. 1. 



Oxytelis acu7ninatus Steindachnek, Reise der osterreichischen Fregatte Novara 

 . . . , Eeptilien, 1867, p. 72. — Boulengeb, Catalogue of the snakes in the 

 British Museum, vol. 3, 1896, pp. 192-193. — Bocouet, Mission scientifique au 

 Mexique et dans I'Am^rique centrale. Kept., livr. 15, 1897, pp. 838-840, pi. 65, 

 fig. 4.— Taylor, Univ. Kansas Sci. Bull., vol. 27, 1941, p. 138, pi. 6, figs. 7, 8, 9. 



OxyieUs fulgidus Ceimmins {nee Daudin), Copeia, 1937, No. 4, p. 233. 



Type. — Unknown. 



Type locality. — Espiritu Santo River, Brazil. 



Range. — Central Sonora and central Nuevo Leon southward on both 

 coasts, including the Yucatan Peninsula, to Brazil, Bolivia, and 

 Ecuador; Maria Madre Island, Tres Marias Islands (recorded in 

 Mexico from the states of Cliiapas, Colima, Guerrero, Jalisco, Micho- 

 acan, Nayarit, Nuevo Leon, Oaxaca, Puebla, Sinaloa, Sonora, Tabasco, 

 Tamaulipas, Veracruz, and Yucatan). 



OXYBELIS FULGIDUS (Dandin) 



Coluber fulgidus Daudin, Histoire naturelle . . . des reptiles, vol. 6, An. 11, 1803, 

 pp. 352-354, pi. 80. 



Oxybelis fulgidus Dum^kil, Bibeon, and Dumeeil, Erp^tologie gen6rale, vol. 7, 

 pt. 2, 1854, pp. 817-819. — Boulengee, Catalogue of the snakes in the British 

 Museum, vol. 3, 1896, pp. 191-192. — Bocouet, Mission scientifique au Mexique 

 et dans I'Amerique centrale, Rept., livr. 15, 1897, pp. 840-842, pi. 65, fig. 5.— 

 Taylor, Univ. Kansas Sci. Bull., vol. 27, 1941, p. 138, pi. 6, figs. 1, 2, 3. 



Type. — Mus. Hist. Nat. Paris. 



Type locality — Unknown; "Port-au-Prince, Saint Domingue." 

 Range. — Yucatan and the Isthmus of Tehuantepec southward 

 through Central and most of South America, to northern Argentina 

 (known in Mexico from the states of Yucatan, Oaxaca, and Chiapas). 



♦OXYBELIS MICROPHTHALMUS Barbour and Amaral " 



Oxybelis microphthalmus Baebour and Amaeal, Proc. New England Zool. Club, 

 vol. 9, 1926, pp. 80-81. — Schmidt and Davis, Field book of snakes, 1941, pp. 

 266-268, fig. 88. 



Type.— Mus. Comp. Zool. No. 22417. 



" Not yet recorded from Mexico, but almost certainly it occurs there ; tbe type locality 

 is about 4 miles north of the international boundary line. 



