« <i>Phylloscopus</i> (<i>Acanthopneuste</i>) <i>tenellipes</i> » = <i>Phylloscopus tenellipes</i> (<a href="https://en.wikipedia.org/wiki/Pale-legged_Leaf_Warbler" class="extiw" title="en:Pale-legged Leaf Warbler">Pale-legged Leaf Warbler</a>) - male
<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/ornithographiaro214ples#page/n385/mode/2up">Ornithographia rossica</a>