A checklist and key to the snakes of the genus Geophis (Squamata: Colubridae: Dipsadinae), with commentary on distribution and conservation Author Wilson, Larry David Author Townsend, Josiah H. text Zootaxa 2007 1395 1 31 journal article 10.5281/zenodo.273681 1414766b-1cb5-4fdb-be42-306fac45815d 1175­5326 273681 15. Geophis dugesii Bocourt Geophis dugesii Bocourt 1883 : 573 . E ( lapoidis ) dugesi : Cope 1885 : 386 . Geophis dugesi : Cope 1885 : 386 . Catastoma dugesii : Amaral 1929 : 191 . Geophis aquilonaris Legler 1959 : 329 . Geophis dugesi : Duellman 1961 : 96 . Geophis dugesii aquilonaris : Webb 1977 : 551 . Geophis dugesii dugesii : Webb 1977 : 551 . Geophis dugesi aquilonaris : Vazquez­Diaz & Quintero­Diaz 1999 : 235 . Holotype . Museum National d’Histoire Naturelle, Paris ( MNHN ) 83­278, male collected by O . Navarro and given to A. Dugés. Type­locality. Tangancicuaro, Mexico . Distribution. Known from Aguascalientes, Jalisco, Michoacan, Sinaloa, Durango, and Chihuahua, 1500­ 2100 m elevation. Species group. chalybeus ( Downs 1967 ) . Systematic references. Bocourt (1883) , Smith (1939), Legler (1959) , Downs (1967) Webb (1977) , Rodriguez Torres & Vásquez Díaz (1990) . Remarks. Downs (1967: 62­63) tentatively assigned two specimens from southern Sinaloa to Geophis dugesii . Webb (1977: 551) reduced G. aquilonaris to a subspecies of G. dugesii based on a collection of specimens from Durango and Sonora.