What kind of insect is this?

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There are so many of these grasshoppers here in Louisiana. They are shiny black with a florescent yellow stripe. They get huge. It seems this little flower bed is full of them! This picture captures a few of them, but they are all over the place almost like a plague sometimes!! ANybody know what they are actually called? All I know is that they get really big and are scarey when they fly at you!!!