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Tropidacris collaris
The adult grasshopper was huge, about 4 inches long. I believe the other attached pictures are immature stages of the same species.
The adults were flying around in the grassy/brushy fields near the Kaieteur airport. The immature grasshoppers were feeding on plants in a damp area near the airport building at the edge of the woods.
I think this is Tropidacris cristata.