This does not rule out Jaguarandi that I have seen 'blackish' in the wild in Florida.
From Cryptomundo: http://www.cryptomundo.com/cryptozoo-news/07blk-bobcat/
" I am a state licensed nuisance wildlife trapper located in southern Florida. I thought you might be interested in this. On Wednesday night I was contacted by a very excited/scared land owner in Martin County, Florida. The day before something killed her 30lb male turkey. She arrived home Wednesday evening to begin searching for the carcass which she couldn’t find on Tuesday. As she came out of the cane grass she saw what she described to me as a large black cat. Larger than a bobcat, more like panther size.
She was convinced that what she saw was someone’s escaped black jaguar or black leopard. I headed up the next morning to search for sign of a large cat but found only bobcat size prints along the bank of the Okeechobee Waterway (St. Lucie Canal) on her property known as “The Last Stand”. After doing some research I believed that what I was searching for was a melanistic bobcat.
I set up the live-catch trap baited with a fresh killed rooster. The next morning I got the cat. A 16 lb., ~2 year old, healthy male melanistic bobcat. The cat is alive and well and currently being kept at a local wildlife center until a decision is made as to where he will end up. I have been able to track down 13 previous confirmed (either captured cats or photo evidence) records of melanistic bobcats in south and south central Florida since the 1st one in 1939.
I believe this male makes 14 and currently the only living one in captivity….Feel free to pass along this [information] and attached photos.
Deron Hartman, Busch Wildlife Sanctuary"