Naturalist and diplomat. Brother of George Macleay. Originated the circular or quinary system of classification. Diplomat in France and then Havana; retired in 1837. In 1839, emigrated to Sydney, Australia, where he devoted himself to the study of Australian natural history. Made large collections of Australian insects and marine fauna, and supervised the cultivation of exotic plants in his private gardens. Trustee of the Australian Museum, 1841–62.
Sources: Aust. dict. biog. ODNB. (See the bibliography for full references to sources)