Cemophora coccinea Scarletsnake
Some other names for this species:
Scarlet Snake
Subspecies I've seen:
C. c. coccinea
Florida Scarletsnake
Cemophora coccinea coccinea Florida Scarletsnake
Main Park Road, Everglades National Park, Miami-Dade County, FloridaMarch 12, 2013
Florida Scarletsnake (Cemophora coccinea coccinea)
This is one of two harmless southeastern U.S. snakes whose bright colors have apparently evolved to mimic the highly venomous Eastern Coral Snake (Micrurus fulvius). The other mimic is the Scarlet Kingsnake (Lampropeltis elapsoides). I have yet to see either of those other two somewhat similar-looking snakes, but I'll keep looking.
Printed references: