SUMMARYIn the course of the International Indian Ocean Expedition two storm‐petrels, thought to beOceanodroma matsudairaeandO. monorhis, were encountered in the western Indian Ocean in some numbers. Two specimens of each species were collected,monorhisin the Arabian Sea,matsudairaeoff N.W. Australia.O. matsudairae, which had not been recorded before from these waters, appeafed to be concentrated within 5° of the equator and the birds probably belonged to the spring‐breeding population of Volcano Island.O. monorhiswas found mostly in the Arabian Sea.Bulweria bulwerii, for which there was but one certain Indian Ocean record, was also encountered several t