Resumo em Português:
São descritas I. martinsi sp. nov. e I. zamalloae sp. nov. São redescritas as formas bolivianas de ambos sexos de I. laevicollis Tippmann, 1953, I. ichneumoniformis Bates, 1870 e I. planifrons Zajciw, 1972. Nova sinonímia estabelecida: I. laevicollis Tippmann, 1953 = I. carinifrons Zajciw, 1972 syn. nov. São fornecidas notas sobre flores-hospedeiras, fotografias e chave para as espécies bolivianos.Resumo em Inglês:
I. martinsi sp. nov. and I. zamalloae sp. nov. are described. Bolivian forms of both sexes of I. ichneumoniformis Bates, 1870, I. laevicollis Tippmann, 1953, and I. planifrons Zajciw, 1972 are redescribed. New synonymy established: I. laevicollis Tippmann, 1953 = I. carinifrons Zajciw, 1972 syn. nov. Notes on host-flowers, photographs and a key to the Bolivian species of Isthmiade are provided.