<br><ul><li><b>1, 2, 3.</b> « <i>Pratincola maura var. przewalskii</i> » = <i>Saxicola maurus przewalskii</i> (Subspecies of <a href="https://en.wikipedia.org/wiki/Siberian_Stonechat" class="extiw" title="en:Siberian Stonechat">Siberian Stonechat</a>) - adult male, young male and female</li>
<li><b>4.</b> « <i>Accentor alpinus var. rufilatus</i> » = <i>Prunella collaris rufilata</i> (Subspecies of <a href="https://en.wikipedia.org/wiki/Alpine_Accentor" class="extiw" title="en:Alpine Accentor">Alpine Accentor</a>) - male</li></ul>
<bdi><a href="https://en.wikipedia.org/wiki/en:Gustav_M%C3%BCtzel" class="extiw" title="w:en:Gustav Mützel"><span title="German artist (1839-1893)">Gustav Mützel</span></a>
</bdi>
1889
<a rel="nofollow" class="external text" href="https://archive.org/stream/NauchnyerezulYt2IAka#page/n169/mode/2up">Nauchnye rezulʹtaty puteshestvyǐ N.M. Przhevalʹskago po t͡sentralʹnoǐ Azii, Tom II. Ptit͡sy, Obrabotal Ḟ.D. Pleske</a>