Moved from Field Crickets.

This specimen resembles Gryllus personatus, but I'm not sure if that species is in Florida. It is one of the few easily identified species of the Great Plains and southwest, where it both looks and sounds distinctive.

follow-up 12-12-08
First, turns out, G. personatus is found on the Great Plains and the southwest (I have collected it in Nebraska, Kansas, Texas, New Mexico, Oklahoma, Colorado, New Mexico, Chihuahua, Arizona, and Utah), but it is not supposed to be found in Florida. So, if one is found from the southwest that looks something like this, it is probably G. personatus, but probably not one from Florida.
However, I've been digging into Gryllus species again, trying to learn them better. I find one (G. assimilis in the strict sense) that also matches the pattern of this one, and that one does occur in Florida. I'm not certain this is correct, because this is a last instar nymph, and it is possible it will change colors entirely when it matures. However, I suspect it will regain this pattern, and I strongly suspect it is this species.

Compare these:
G. assimilis nymphs
G. assimilis female
another female
G. assimilis male
another male