Several taxa of birds have been named in his honor, including the Cretaceous genus Alexornis and the tanagers Wetmorethraupis sterrhopteron and Buthraupis wetmorei.
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In 1939 he was elected a Corresponding Member of the Royal Australasian Ornithologists Union
It was discovered by the Ronne Antarctic Research Expedition (RARE), 1947–48, under Ronne, who named this feature for Alexander Wetmore, Secretary of the Smithsonian Institution, who assisted Ronne in laying out the scientific research program of the expedition.
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Bone fragments of this species were first unearthed by archaeologist Theodoor de Booy in kitchen midden deposits on the Richmond estate near Christiansted, U.S. Virgin Islands in July 1916 and described by Alexander Wetmore in 1918.
Between 1955 and 1956 the ornithologists William Henry Phelps and Alexander Wetmore collected four specimens in the type locality at the hacienda La Providencia at the Rio Chiquita in the south-western part of Táchira, Venezuela.