<i>Gyrinus natator</i>
<a href="https://en.wikipedia.org/wiki/de:Edmund_Reitter" class="extiw" title="w:de:Edmund Reitter">Edmund Reitter</a> (1845-1920): "Fauna Germanica: Die Käfer des deutschen Reiches" 1909.
Cutted and pasted from <a href="//commons.wikimedia.org/wiki/File:Reitter_Dytiscus_u.a._2.jpg" title="File:Reitter Dytiscus u.a. 2.jpg">File:Reitter Dytiscus u.a. 2.jpg</a>. Needs better version using File:Reitter-1908 table40.jpg