<br><ul><li><b>1.</b> &amp; <b>2.</b> « <i>Phylloscopus tristis</i> » = <i>Phylloscopus collybita tristis</i> (Subspecies of <a href="https://en.wikipedia.org/wiki/Common_Chiffchaff" class="extiw" title="en:Common Chiffchaff">Common Chiffchaff</a>) - male and female</li>
<li><b>3.</b> &amp; <b>4.</b> « <i>Phylloscopus tristis var. sindiana</i> » = <i>Phylloscopus sindianus</i> (<a href="https://en.wikipedia.org/wiki/Mountain_chiffchaff" class="extiw" title="en:Mountain chiffchaff">Mountain chiffchaff</a>) - males</li>
<li><b>5.</b> « <i>Reguloides superciliosus var. mandellii</i> » = <i>Phylloscopus humei mandellii</i> (Subspecies of <a href="https://en.wikipedia.org/wiki/Hume%27s_leaf_warbler" class="extiw" title="en:Hume's leaf warbler">Hume's leaf warbler</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/n165/mode/2up">Nauchnye rezulʹtaty puteshestvyǐ N.M. Przhevalʹskago po t͡sentralʹnoǐ Azii, Tom II. Ptit͡sy, Obrabotal Ḟ.D. Pleske</a>