BULLETIN FLORIDA MUSEUM NATURAL HISTORY VOL. 38 PT. I Elapheguttata guttata (Linnaeus), CORN SNAKE. Uncommon. High pine sandhills, xeric oak and mesic hardwood hammocks, pine plantations, old fields, and around buildings. Elaphe obsoleta quadrivittata (Holbrook), YELLOW RAT SNAKE. Probably common. Xeric oak and mesic hardwood hammocks, swamp forests, wet prairies, and ruderal habitats. Farancia abacura abacura (Holbrook), EASTERN MUD SNAKE. Uncommon. Darkwater lakes and marshes. Heterodon platyrhinus Latreille, EASTERN HOGNOSE SNAKE. Uncommon. High pine sandhills, xeric oak hammocks, and old fields. Masticophis flagellum flagellum (Shaw), EASTERN COACHWHIP. Common. High pine sandhills, xeric oak hammocks, and old fields. Nerodia floridana (Goff), FLORIDA GREEN WATER SNAKE. Uncommon. Darkwater lakes and marshes. Nerodia fasciata pictiventris (Cope), FLORIDA WATER SNAKE. Common. Darkwater and sandhill lakes and ponds. Nerodia taxispilota (Holbrook), BROWN WATER SNAKE. Uncommon. Darkwater lakes and Mill Creek. Opheodrys aestivus (Linnaeus), ROUGH GREEN SNAKE. Uncommon. Xeric oak and mesic hardwood hammocks and ruderal habitats. Pituophis melanoleucus mugitus Barbour, FLORIDA PINE SNAKE. Common. High pine sandhills and ruderal habitats. Regina alleni (Garman), STRIPED CRAYFISH SNAKE. Uncommon. Darkwater and sandhill lakes and ponds. Seminatrix pygaea pygaea (Cope), NORTH FLORIDA SWAMP SNAKE. Common. Darkwater and sandhill ponds and lakes. Tantilla relicta neilli Telford, NEILL'S CROWN SNAKE. Common. High pine sandhills, xeric oak hammocks, and occasionally mesic hardwood hammocks. Thamnophis sauritus sackenii (Kennicott), PENINSULA RIBBON SNAKE. Uncommon. Margins of darkwater and sandhill ponds and lakes. Thamnophis sirtalis sirtalis (Linnaeus), EASTERN GARTER SNAKE. Uncommon. High pine sandhills, xeric oak and mesic hardwood hammocks, and margins of sandhill lakes. FAMILY Elapidae Micrurus fulvus fulvius (Linnaeus), EASTERN CORAL SNAKE. Common. High pine sandhills and xeric oak and mesic hardwood hammocks. FAMILY Crotalidae Agkistrodon piscivorus conanti Gloyd, FLORIDA COTTONMOUTH. Rare. Known from four specimens from the darkwater system. Crotalus adamanteus Beauvois, EASTERN DIAMONDBACK RATTLESNAKE. Common. Xeric oak and mesic hardwood hammocks and occasionally high sandhills. Sistrurus miliarius barbouri Gloyd, DUSKY PIGMY RATTLESNAKE. Common. High pine sandhills, xeric oak hammocks, and margins of darkwater and sandhill ponds and lakes.