On a new Duck from the island of Sumba

Amongst a number of unregistered bird-skins in our Museum, which passed through my hands a few weeks ago, I found a Duck from the Island of Sumba with very worn plumage and damaged feet, probably a female or an immature male, which I was unable to identify with any known species. Count Salvadori, to whom I sent the bird for comparison, kindly wrote me that the bird certainly belongs to a new species, but that it is rather difficult to find the right place for it in the system, unless we can dispose of an adult male. For this reason I do not wish, for the present, to give the bird a definitive generic name, and consequently propose to name it, in honour of Count Salvadori, the author of the recent excellent monograph of the Anseres in the Catalogue of Birds in the British Museum