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Rhiginia cruciata
Appears to be mating
Pine needle brush norther Florida
This is definitely not Rhiginia cruciata, nor is it an assassin bug. R. cruciata looks like this: http://www.projectnoah.org/spottings/818....
The ID I suggested looks to be much closer, and if it's not the same species, I would be surprised if it's in a different genus.