Björn Bergenholtz
(former alias "Calalp")

Nothing much, nothing truly 'new' (and certainly nothing contradictory) to what we already know, only some minor info, simply some details (a Birth Place/Nationality, some Military Ranks, etc.), of the guy commemorated in ...
dunni as in:
• Dunn's Lark (Ammomanes) Eremalauda dunni SHELLEY 1904 (here) as "Calendula dunni" ... [erroneously* – !?!]: "Named after its discoverer Major W. H. Dunn.", collected at "Ogageh, Sudan, Nov. 20, 1902."
In today's Key explained as:
Also note that Shelley's "misprint" (in 1904) seems to be only re. the initials of Dunn, not of his rank.
In short: Born 7 September 1864, in Kinsale, Cork, Ireland ... Military ranks: he was a mere Lieutenant in 1893, a Captain in 1896 ("Captain H. N. Dunn served with the Dongola Expeditionary Force under Sir Herbert Kitchener in 1896") here or here, (p.958), and in 1902 he was still a "Captain" (when the types were collected), as well as in 1903 (here) ... thereafter a Major in 1904**, see here (when the OD was published, dated "18th of May, 1904), as well, still a Major in 1909 , and in 1911, here (p.105), and onwards ... thereafter climbing the ranks, to Lieut.-Col. in 1918, and so on ... all the way, until he became a Colonel (brevet?) .. and, as such, he died, on the 21st of October 1952, in Bath, England (burried at his Birth place (see his grave, here).
For other example/s, see the Edinburgh Gazette, of 26 September, 1902 (here), or the London Gazette, 15 May, 1903 (here), from when he's still a "Captain", versus the (Sixth supplement to) The London Gazette,dated the 5th (and 8th) of March, 1918 (here, first page):

Enjoy!
Björn
PS. As well, note that Mearns & Mearns (2022)*** (also) has him (in Vol. 1, pp.107–108) as:
/B
*I assume the Key's reference; "(C. S. Houston 1989)" (even if not listed among its References!?), ought to be this one here (p.755, top right column), which was/is a review (pp. 754-756) of Biographies for Birdwatchers, by Barbara Mearns & Richard Mearns (1988).
** The same Dunn is also commemorated in, for examples, in the following two Non-Birds;
dunni as in:
• Dunn's Lark (Ammomanes) Eremalauda dunni SHELLEY 1904 (here) as "Calendula dunni" ... [erroneously* – !?!]: "Named after its discoverer Major W. H. Dunn.", collected at "Ogageh, Sudan, Nov. 20, 1902."
In today's Key explained as:
... which might/could be expanded into the Irish Dr. Henry Nason Dunn (1864–1952), ... and onwards (just as we're told in the Key): ... from 1904 stationed in India [in the Royal (Army) Medical Corps].Capt. Henry Nason Dunn (1864-1952) British Army surgeon, big-game hunter, collector in the Sudan, Somaliland, Ethiopia and India (“Although G. E. Shelley [1904] ...attributed Dunn’s Lark to Major W. H. Dunn, this is a misprint for Captain H. N. Dunn, correctly stated on the original specimen label” (C. S. Houston 1989) (Eremalauda).
Also note that Shelley's "misprint" (in 1904) seems to be only re. the initials of Dunn, not of his rank.
In short: Born 7 September 1864, in Kinsale, Cork, Ireland ... Military ranks: he was a mere Lieutenant in 1893, a Captain in 1896 ("Captain H. N. Dunn served with the Dongola Expeditionary Force under Sir Herbert Kitchener in 1896") here or here, (p.958), and in 1902 he was still a "Captain" (when the types were collected), as well as in 1903 (here) ... thereafter a Major in 1904**, see here (when the OD was published, dated "18th of May, 1904), as well, still a Major in 1909 , and in 1911, here (p.105), and onwards ... thereafter climbing the ranks, to Lieut.-Col. in 1918, and so on ... all the way, until he became a Colonel (brevet?) .. and, as such, he died, on the 21st of October 1952, in Bath, England (burried at his Birth place (see his grave, here).
For other example/s, see the Edinburgh Gazette, of 26 September, 1902 (here), or the London Gazette, 15 May, 1903 (here), from when he's still a "Captain", versus the (Sixth supplement to) The London Gazette,dated the 5th (and 8th) of March, 1918 (here, first page):

Enjoy!
Björn
PS. As well, note that Mearns & Mearns (2022)*** (also) has him (in Vol. 1, pp.107–108) as:
Henry Nason Dunn (1864–1952),
... British army surgeon, ...
[as well mentioned, ... born in County Cork, Ireland]
/B
*I assume the Key's reference; "(C. S. Houston 1989)" (even if not listed among its References!?), ought to be this one here (p.755, top right column), which was/is a review (pp. 754-756) of Biographies for Birdwatchers, by Barbara Mearns & Richard Mearns (1988).
** The same Dunn is also commemorated in, for examples, in the following two Non-Birds;
• the Somalia gerbil Gerbillus dunni [OLDFIELD] THOMAS 1904 (here), as "Gerbilus (s. s.) Dunni" (also see p.94): "... obtained in Somaliland by Major H. N. Dunn, R.A.M.C. [Royal Army Medical Corps] ..."
• the debated "Northern Field-Mouse" Mus "dunni" WROUGHTON 1912 (here) as "Leggada dunni" "... collected 1st of January 1909, in Punjab, India, by "Major H. N. Dunn, R.A.M.C. [The latter today (most often) considered as a synonym of either Earth-colored mouse Mus terricolor BLYTH 1851/2? alt. Mus booduga GRAY 1837].
*** Biographies for Birdwatchers – The Lives of Those Commemorated in Western Palearctic Bird Names (Revised and expanded edition), by Barbara Mearns and Richard Mearns (662 pages, in two volumes), © 2022.
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