Flat-headed Snakes (Tantilla) also commonly known as Black-headed Snakes or Crowned Snakes, is a biological genus in the family Colubridae (Colubrids) and order Squamata (Squamates).
Tantilla andinista
Tantilla bairdi
Tantilla supracincta
Tantilla albiceps
Tantilla cucullata
Tantilla nigra
Tantilla melanocephala
Tantilla moesta
Tantilla bocourti
Tantilla alticola
Tantilla briggsi
Tantilla capistrata
Tantilla ceboruca
Tantilla taeniata
Tantilla wilcoxi
Tantilla berguidoi
Tantilla deppei
Tantilla gracilis
Tantilla relicta
Tantilla sertula
Tantilla impensa
Tantilla coronadoi
Tantilla vermiformis
Tantilla jani
Tantilla johnsoni
Tantilla lempira
Tantilla brevicauda
Tantilla atriceps
Tantilla cascadae
Tantilla insulamontana
Tantilla oaxacae
Tantilla calamarina
Tantilla hendersoni
Tantilla petersi
Tantilla nigriceps
Tantilla shawi
Tantilla robusta
Tantilla rubra
Tantilla schistosa
Tantilla reticulata
Tantilla oolitica
Tantilla semicincta
Tantilla slavensi
Tantilla hobartsmithi
Tantilla coronata
Tantilla striata
Tantilla tritaeniata
Tantilla trilineata
Tantilla triseriata
Tantilla tayrae
Tantilla vulcani
Tantilla planiceps
Tantilla tecta
Tantilla yaquia
Tantilla flavilineata
Dendrelaphis
Coniophanes
Boiga
Storeria
Leptodeira
Erythrolamprus
Elaphe
Regina
Bogertophis
Tantilla
Arizona
Pituophis
Philodryas
Opheodrys
Heterodon
Gyalopion
Drymarchon
Lampropeltis
Clonophis
Phyllorhynchus
Tropidoclonion
Rhadinaea
Rhinocheilus
Trimorphodon
Senticolis
Farancia
Drymobius
Hypsiglena
Thamnophis
Pantherophis
Salvadora
Coluber
Diadophis
Chilomeniscus
Cemophora
Contia
Chionactis
Liodytes
Oxybelis
Nerodia
Arrhyton
Alsophis
Carphophis