Richmond C.W. (1917): Generic names applied to birds during the years 1906 to 1915, inclusive, with additions to Waterhouse's "Index generum avium".
Proc.U.S.Natl.Mus., 53:565-636.
http://www.archive.org/stream/proceedingsofuni531917united#page/584/mode/1up
"Clanga TYZENHAUS, in Adamowicz, Revue et Mag. de Zool., sér. 2, vol. 9, for December, 1857 (1858), p. 104.
Type Falco maculatus GMELIN...........(Buteonidae)
(Tautonymy; Aquila clanga Pallas is a synonym.)"
Friedmann H. (1950): The birds of north and middle America.
Bull.U.S.Natl.Mus. 50(11):1-793.
http://www.archive.org/stream/bulletinunitedst50111950unit#page/452/mode/1up, as a synonym of
Aquila:
"Clanga TYZENHAUS, in Adamowicz, Rev. Mag. Zool., sér. 2 (ix), for Dec. 1857 (1858), 104.
Type, by tautonymy, Falco maculatus Gmelin=Aquila clanga Pallas)."
John Penhallurick's notes almost look like a direct quote of these.
The text on the
Richmond Index card at Zoonomen is slightly different, though, with the author the other way around ("Adamowicz, ex Tyzenhaus", not "Tyzenhaus, in Adamowicz"--thus recognising the publication and disregarding the MS, which is the "modern way"), and all three originally-included species listed without declaring one of them the type.
My reading of the current Code is that a type fixation by tautonymy would have required that
Aquila clanga Pallas be
cited in the original publication introducing
Clanga, and it's not. (But this may be another long-standing difference between what the Code says and what ornithologists do in terms of type-species fixation...? In any case, Peters seems to recognise quite a few similar type fixations [tautonymy, via a statement with an "=" sign between two binomina].)
If the name was used during 1906-1915 (as suggested by its inclusion in Richmond, 1917), or before, it would be interesting to know by whom, and how. (I don't find anything on the web.) It is used (as a subgenus) on the pages of the Museum Wiesbaden, which claim to follow Wolters (1982) as its "Ordnungsprinzip":
http://www.mwnh.de/samm042.html. Did Wolters use it?
Re. Heinrich Karl Leopold, Graf von der Mühle: no doubt. (See also the Richmond Index card, that has "Heinr. Graf" inserted in front of the name.) But in his writings, I can't find anything that looks like an
Aquila macrodactyla or a
Falco macrodactylus. The two references to von der Mühle's works that appear on the Index card suggest that Richmond also looked for this. One is in
Isis (Oken) and is here:
http://www.archive.org/stream/isisvonoken1847oken#page/236/mode/1up; the other is the
Beiträge zur Ornithologie Griechenlands:
www.archive.org/stream/beitraegezurorni00mh. Both are striked out on the card, so apparently no success...
Couldn't
macrodactyla be a typo for
brachyctyla (short-toed eagle)...? Tyzenhaus lists this species along with small
Aquila in his
Remarques sur les Aigles d'Europe, and in the text he strongly rejects the separate placement of this species in "
Circaëtos". Then, if his "
Clanga fasciata" is Bonelli's eagle, what he would be advocating here, would be to separate the largest eagles (golden, imperial, and the likes) from the smaller ones. Something not too dissimilar from what we used to do with
Hieraeetus, in a sense; but with short-toed kept within the eagles, and with a "size limit" placed somewhat higher.