During my recent visit to the Leyden Museum I was much interested in examining the fine series of birds’-skins which had been brought home by Mr. Büttikofer and Mr. Stampfli from their expeditions to Liberia. Amongst other valuable specimens I was particularly attracted by a small Sparrow-Hawk, of which Mr. Büttikofer had preserved three adults, two females and a male. These are identified by him as Accipiter hartlaubi of Verreaux ¹), but I saw at once that they were not the same as the bird I had so named in the Catalogue of Birds (Vol. I, p. 150; pl. 6, fig. 2).