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 14. Geophis duellmani Smith & Holland Geophis duellmani Smith & Holland 1969: 47. Holotype . University of Kansas Natural History Museum & Biodiversity Research Center (KU) 87447, an adult female collected 19 June 1964 by R. L. Holland . Type­locality. Two miles south of Vista Hermosa, 1750 m elevation, Oaxaca, Mexico . Distribution. Known only from the vicinity of the type locality in Oaxaca, Mexico . Species group. dubius ( Smith & Holland 1969 ). Systematic references. Smith & Holland (1969) , Smith & Flores Villela (1993).