Two new Aspidosperma-Aspidosperma-type bisindole alkaloids, hazuntiphyllidine and anhydrohazuntiphyllidine [4], have been isolated from the leaves of Hazunta modesta var. modesta subvar. divaricata. Their structures were established by spectroscopic means. In solution, hazuntiphyllidine was found to occur in two distinct structural forms 2 or 3 depending upon the solvent used. Previously, we described the structural determination of hazuntiphylline [1], an Aspidosperma-Aspidosperma-type symmetrical bisindole alkaloid, from the leaves of Hazunta modesta var. modesta subvar. divaricata Mgf. (Apocynaceae), a plant endemic to the Nosy-Be region of Madagascar (1). We now report the isolation and structure elucidation of two closely related new bisindole alkaloids, hazuntiphyllidine and anhydrohazuntiphyllidine [4], from the same source. In solution, hazuntiphyllidine is found to exist in two different structural forms depending upon the solvent employed. Thus, structure 2 has been established for hazuntiphyllidine in C6H6-d6 solution, while the open form 3 occurs in DMSO-d6 solution.