70 BULLETIN 18 7, UNITED STATES NATIONAL MUSEUM 



TyTpe locality. — ^Mexico. 



Range. — Southern -central Oaxaca (known only from near Pluma 

 Hidalgo). 



GEOPHIS SEMIANNULATUS Smith 



Geopliis semiannulatus Smith, Proc. New England Zool. Club, vol. 18, 1941, pp. 

 4<>-51 ; Copeia, 1942, No. 4, pp. 2o9-260. 



Type.— Mus. Comp. Zool. No. 11422. 



Type locality. — Colima (possibly in error). 



Range. — ^Known only from the type locality and Guerrero, Hidalgo. 



GEOPHIS SEMIDOLIATUS (Dumeril, Bibron, and Dumeril) 



Ehabdosoma semidoUaUim Dumekix, Bibkon, and Dumeril, Ei-petologie genSrale, 



vol. 7, pt. 1, 18r>4, pp. 93-95. 

 Geopliis semidoUatus Petees, ]\Ionatsb. Akad. Wiss. Berlin, 1859, p. 276. — Tayloh 



and Smith, Univ. Kansas Sci. Bull., vol. 25, 1938 (1939), pp. 244-245. 



Type. — ^Mus. Hist. Nat. Paris, five cotypes. 

 Type locality. — Mexico. 



Range. — Foothills of central Veracruz, northeastern Hidalgo, and 

 northeastern Oaxaca. 



GEOPHIS SIEBOLDI (Jan) 



Elapoides sieloldi Jan, Arch. Zool. Anat. Fis., vol. 2, 1862, pp. 21-22; Icono- 



graphie gen^rale des ophidiens, livr. 12, 1865, pi. 1, fig. 5. 

 Geopliis siehoJdii Smith, Smithsonian Misc. Coll., vol. 90, No. 19, 1941, p. 4. 



Type. — Milan, Monaco, Vienna Mus., cotypes. 

 Type locality. — ^"Mexico" and "Guadelupa." 

 Range. — Unknown. 



Genus GYALOPION Cope 



Gyalopion Cope, Proc. Acad. Nat. Sci. Philadelphia, vol. 12, 1860, p. 243. — 

 Smith and Tayxok, Journ. Washington Acad. Sci., vol. 31, 1941, pp. 358-362, 

 figs. 1-2, 6-7, 11, 15-17. 



Genotype. — Gyalopion canura Cope. 



Range. — Western Texas west and south to central Sinaloa. 



Species. — Three, all occurring in Mexico. 



KEY TO SPECIES OF GYALOPION 



1. Dark markings on head and middorsum brown, black-edged; head mark- 



ings variable, not a single large blotch fused w ith first nuchal spot__ canum 

 Dark markings on head and middorsum uniform black ; a large black spot 

 on head, fused with first nuchal spot 2 



2, Markings restricted to middorsum, not extending onto sides of body; 26 



spots on body ; no loreal quadrangularis 



Markings extending onto sides of body to ends of ventrals ; 32 spots on 

 body; a loreal desertorum 



