Species:

Nerodia rhombifer

Diamond-backed Watersnake

Some other names for this species:

Diamondback Watersnake

Subspecies I've seen:
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Northern Diamond-backed Watersnake
N. r. rhombifer
Subspecies:

Nerodia rhombifer rhombifer

Northern Diamond-backed Watersnake

Sighting:
May 11, 2004
Hematite Lake, Land Between The Lakes National Recreation Area, Trigg County, Kentucky
Northern Diamond-backed Watersnake (Nerodia rhombifer rhombifer)
This young watersnake was the seventy-first and final snake I saw on our nearly four-month trip from California to Florida and back.