Björn Bergenholtz
(former alias "Calalp")

Here's a question (first) regarding Herr/Mr Zietz (Junior), commemorated in ...
zietzi as (at least) in:
• the (Scrub/Brown) Thornbill ssp. Acanthiza pusilla zietzi NORTH 1904 (here, in text, top of page), as "Acanthiza zietzi":
Though, I do not know if the same dedicatee also was intended in/for ...
• the Rock Parrot ssp. Neophema petrophila zietzi MATHEWS 1912 (here), as "Psephotus petrophilus zietzi", in the usual way by Mathews, no dedication, no explanation, nothing ...
But, most likely not, as the Richmond Card, for the latter taxon (here), clearly states: "For Amandus Heinrich Christian Zietz, 1839?–1921." (and note the question mark).
Either way, in today's Key we find the following explanation/s:
As I understand it, the former (junior guy) was called Robert in everyday Life (as, for example, here), but what was his actual full name ... ?
Does anyone know if Juniors first given name truly was Friedrich, or if it was 'Fritz' (as he was called in Australia)?
Or was the latter just his nick-name (typical for many Germans)? Or not?
An Obituary after "Mr. F. R. Zietz, R.A.O.U." was published in The Emu 22 (1), 1922, here, which began with the following Phrase:
Wikispecies has him as: "Fritz Robert Zietz" (commemorated in an Australian Lizard); here. Ditto in Wikidata (here).
As Mr F. R. Zietz himself is also the Author (Auctor) of quite a few Bird taxa, he's as well listed in Zoonomen's Author Index, where we find him as:
Note that Zoonomen also incl. Zietz Sr., as [my blue bold]:
Either way, in Bibiography of the Birds of Australia, by Gregory M. Mathews (1925)*, the Author (also the Auctor of the latter taxon) himself (even if he's not the most trustworthy) lists them both, on p.148, as:

Thus, was Junior's full name; 'Fritz', or Friedrich Robert Zietz (1874–1922) ... ?
Anyone who knows (for sure)?
As his Father seems to have moved to Australia in 1883 I assume that the Son was born back in Germany (maybe in Hamburg?).
Take it all for what it's worth (if anything), it's just some observations (made along the way, while looking for other guys), neither one are incl. in my MS, thereby not checked in any depth (at least not further than what's been shown above).
Good luck pin-pointing them both!
Björn
*Mathews, G. M. 1925. The Birds of Australia / Bibliography of the Birds of Australia: Books used in the Preparation of this Work with a few Biographical details of Authors and collectors. Supplement 5. H. F. & G. Witherby, London. (here)
zietzi as (at least) in:
• the (Scrub/Brown) Thornbill ssp. Acanthiza pusilla zietzi NORTH 1904 (here, in text, top of page), as "Acanthiza zietzi":
An adult female, procured by Mr. F. R. Zietz in October, 1901, at Queenscliff, on Kangaroo Island, appears to be an insular form, ... I purpose to distinguish Acanthiza zietzi after its discoverer, ...
Though, I do not know if the same dedicatee also was intended in/for ...
• the Rock Parrot ssp. Neophema petrophila zietzi MATHEWS 1912 (here), as "Psephotus petrophilus zietzi", in the usual way by Mathews, no dedication, no explanation, nothing ...
But, most likely not, as the Richmond Card, for the latter taxon (here), clearly states: "For Amandus Heinrich Christian Zietz, 1839?–1921." (and note the question mark).
Either way, in today's Key we find the following explanation/s:
zietzi
● Friedrich Robert Zietz (1874-1922) German /Australian preparator, collector, Ornithologist at South Australian Mus. 1891-1922, founder member of RAOU, son of Amandus Zietz (subsp. Acanthiza pusilla).
● Amandus Heinrich Christian Zietz (1839-1921) German collector, preparator, emigrated to Australia 1884, Assistant Director of South Australian Mus. 1888-1909, founder member of RAOU, aviculturalist (subsp. Neophema petrophila).
As I understand it, the former (junior guy) was called Robert in everyday Life (as, for example, here), but what was his actual full name ... ?
Does anyone know if Juniors first given name truly was Friedrich, or if it was 'Fritz' (as he was called in Australia)?
Or was the latter just his nick-name (typical for many Germans)? Or not?
An Obituary after "Mr. F. R. Zietz, R.A.O.U." was published in The Emu 22 (1), 1922, here, which began with the following Phrase:
Much regret will be felt in the death of Mr. Fritz Robert Zietz, the well-known South Australian ornithologist. ...
Wikispecies has him as: "Fritz Robert Zietz" (commemorated in an Australian Lizard); here. Ditto in Wikidata (here).
As Mr F. R. Zietz himself is also the Author (Auctor) of quite a few Bird taxa, he's as well listed in Zoonomen's Author Index, where we find him as:
Zietz,FR_____________1874-1922
Zietz, Fritz Robert
Note that Zoonomen also incl. Zietz Sr., as [my blue bold]:
Zietz,AHC_____________1840-1921
Zietz, Amandus Heinrich Christian
Either way, in Bibiography of the Birds of Australia, by Gregory M. Mathews (1925)*, the Author (also the Auctor of the latter taxon) himself (even if he's not the most trustworthy) lists them both, on p.148, as:

Thus, was Junior's full name; 'Fritz', or Friedrich Robert Zietz (1874–1922) ... ?
Anyone who knows (for sure)?
As his Father seems to have moved to Australia in 1883 I assume that the Son was born back in Germany (maybe in Hamburg?).
🧩
As well, note that the (English) Wikipedia-page for the Father, Amandus Zietz, (here) claims the Birth (of the latter) as: "13 June 1840", in line with what we're told by Zoonomen (above). Also note that this particular Wiki-page, as well, mention his Son (but as) "Frederick Robert Zietz".
🧩
Take it all for what it's worth (if anything), it's just some observations (made along the way, while looking for other guys), neither one are incl. in my MS, thereby not checked in any depth (at least not further than what's been shown above).
Good luck pin-pointing them both!
Björn
*Mathews, G. M. 1925. The Birds of Australia / Bibliography of the Birds of Australia: Books used in the Preparation of this Work with a few Biographical details of Authors and collectors. Supplement 5. H. F. & G. Witherby, London. (here)
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