Colonel Arthur Hay, 9th Marquess of Tweeddale (9 November 1824 – 29 December 1878), known before 1862 as Lord Arthur Hay and between 1862 and 1876 as Viscount Walden, was a Scottish soldier and ornithologist. He was born at Yester, Gifford, East Lothian. He served as a soldier in India and the Crimea. He succeeded his father to the Marquessate in 1876. He died at Chislehurst, and was succeeded by his brother.
Hay purchased a lieutenantcy in the Grenadier Guards[1] in 1841. He purchased a captaincy in 1846 and was promoted Lieutenant-Colonel without purchase in 1854 and Colonel in 1860. In 1866 he transferred to the 17th Lancers.
He was president of the Zoological Society of London from 16 January 1868.[2][3] His ornithological works were published privately in 1881 by his nephew, Captain Robert George Wardlaw-Ramsay, with a memoir by Dr W. H. Russell, and the attribution Walden is used in taxonomic listings.[4]
He had a large private collection of birds,[5] insects, reptiles and mammals. He employed Carl Bock to travel to the Malay archipelago and collect specimens. Tweeddale described about 40 species collected by Bock for the first time.
| Peerage of Scotland | ||
|---|---|---|
| Preceded by George Hay |
Marquess of Tweeddale 1876–1878 |
Succeeded by William Hay |