Grass Snake, Natrix natrix Jonas Bergsten via Wikicommons, ©.	Western Terrestrial Garter Snake, Thamnophis elegans "Western terrrestrial garter snake" by Nordique via Flickr, Creative Commons Attribution.
Common Garter Snake, Thamnophis sirtalis "Common Garter Snake (Thamnophis sirtalis)" by Franco Folini via Flickr, Creative Commons Attribution ShareAlike.

Taxonomy:

Amplorhinus multimaculatus (Add)

Natrix maura (Add)
Grass Snake, Natrix natrix

Natrix sipedon (Add)
Dice snake, Natrix tessellata (Add)

Gen. Adelophis (Add)
Gen. Clonophis (Add)
Gen. Nerodia (Add)
Gen. Regina (Add)

Regina alleni (Add)
Regina grahami (Add)
Regina rigida (Add)
Queen snake, Regina septemvittata (Add)

Gen. Seminatrix (Add)
Gen. Storeria (Add)
Gen. Thamnophis (Add)

Thamnophis angustirostris (Add)
Thamnophis atratus (Add)
Thamnophis bogerti (Add)
Thamnophis brachystoma (Add)
Thamnophis butleri (Add)
Thamnophis caverna (Add)
Thamnophis chrysocephalus (Add)
Thamnophis conanti (Add)
Thamnophis couchii (Add)
Thamnophis cyrtopsis (Add)
Thamnophis digueti (Add)
Thamnophis dubia (Add)
Thamnophis eburatus (Add)
Western Terrestrial Garter Snake, Thamnophis elegans

Thamnophis eques (Add)
Thamnophis errans (Add)
Thamnophis exsul (Add)
Thamnophis fulvus (Add)
Thamnophis gigas (Add)
Thamnophis godmani (Add)
Thamnophis hammondii (Add)
Thamnophis lineri (Add)
Thamnophis marcianus (Add)
Thamnophis melanogaster (Add)
Thamnophis mendax (Add)
Thamnophis nigronuchalis (Add)
Thamnophis ordinoides (Add)
Thamnophis postremus (Add)
Thamnophis proximus (Add)
Thamnophis pulchrilatus (Add)
Thamnophis radix (Add)
Thamnophis rossmani (Add)
Thamnophis rufipunctatus (Add)
Thamnophis sauritus (Add)
Thamnophis scalaris (Add)
Thamnophis scaliger (Add)
Common Garter Snake, Thamnophis sirtalis

Thamnophis sumichrasti (Add)
Thamnophis validus (Add)

Gen. Tropidoclonion (Add)
Gen. Virginia (Add)