Four previously unrecognized holotypes are listed, and two syntypes reported for another bird described by Koelz, from the Koelz collection in Assam.

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Zoologische Verhandelingen

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Naturalis journals & series

Payne, R. B. (2001). Systematic notes on Asian birds. 20. Recent additions to the list of type specimens of birds collected by Walter Koelz in the University of Michigan Museum of Zoology. Zoologische Verhandelingen, 335, 229–234.