. Bulletin - United States National Museum. Science. REPTILIA: SERPENTES: COLUBRIDAE • *** 117 GEOPHIS GEOPHIS Wagler I83O Catostoma Wagler, Nat. Syst. Amphib.: l')i. Type-species: Catostotna chalybeum Wagler. I83O Geoph i s Wagler, Nat. Syst. Amphib.: 3^2. Substitute name for Catostoma Wagler, I83O, to prevent confusion with Qatn?; Lesueur, I8I7, a fish; Type-species: Catostoma chalybeum Waaler. I853 Rabdosoma Oumeril, Mem. Acad. Sci., 2J: 440. Type-species: Rabdosoma sem idoliatum Dumeril, Bibron, and Dumeril. I855 Coloboqnathus Peters, Monats. Akad. Wiss. Berlin, 1859= 275- Type-spec


. Bulletin - United States National Museum. Science. REPTILIA: SERPENTES: COLUBRIDAE • *** 117 GEOPHIS GEOPHIS Wagler I83O Catostoma Wagler, Nat. Syst. Amphib.: l')i. Type-species: Catostotna chalybeum Wagler. I83O Geoph i s Wagler, Nat. Syst. Amphib.: 3^2. Substitute name for Catostoma Wagler, I83O, to prevent confusion with Qatn?; Lesueur, I8I7, a fish; Type-species: Catostoma chalybeum Waaler. I853 Rabdosoma Oumeril, Mem. Acad. Sci., 2J: 440. Type-species: Rabdosoma sem idoliatum Dumeril, Bibron, and Dumeril. I855 Coloboqnathus Peters, Monats. Akad. Wiss. Berlin, 1859= 275- Type-species: Coloboqnathus Hoffmann i Peters. I86I Geoph idium Peters, Monats. Akad. Wiss. Berlin, 1861: 523- Type-species; Geophidium dubium Peters. 1868 Colophrys Cope, Proc. Acad. Nat. Sc i. Phila., 1868: I3O. Type-species: Colophrys rhodoqaster Cope. I883 Paraqeoph is Bocourt, Miss. Sci. Mex., Rept.: 53*' Type-species: Rabdosoma sem idoliatum Dumeril, Bibron, and Dumeril. I894 Pi rosema Boule^ger, Cat. Sn. Brit. Mus., 2: 298. Type-species: Geoph i 5 b icolor Gunther. Distribution: Tamaulipas and Chihuahua, Mexico to northwestern Colombia. Content: 3* species arranged in seven species-groups, according to the most recent revision by Downs, Misc. Publ. Mus. Zool. Univ. Mich., I3I, 1967' 22 species are extralimital, all in Mex ico. Key to the species 1. Dorsal scales in I7 rows- Dorsal scales in I5 rows- 2. Dorsal scales distinctly keeled on at least posterior half of body 3 Dorsal scales smooth, or keeled only above the vent region 4 3. Dorsum unicolor brownish to blackish nasali s Dorsum light with dark blotches or saddles dunn i 4. Supraocular present, frontal not in orbit 5 Supraocular absent, frontal in orbit (Fig. l)— rhodoqaster Clave de especies 1. Escamas dorsales en I7 filas 2 Escamas dorsales en I5 filas 6 2. Escamas dorsales distintamente quilladas a lo menos en la mitad posterior del cuerpo 3 Escamas dorsales lisas, 0 quilladas solo sobre la region anal 4 3. Dorse uni


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