This unusual grasshopper was a puzzle to us. Thank-you to Dr. Kátia Matiotti, Pontifícia Universidade Católica do Rio Grande do Sul, who provided the family ID.
With the family ID in hand, we looked at numerous Internet images and note a similarity with photos of Omura congrua, a fairly common species, but we don't assert that as an ID.
Photo data: 18 June 2014. On Solanum sp. foliage, Brokopondo district, Suriname.