Illustration of a dobsonfly. The original caption read:<br>Fig. 511.--<i>Corydalus cornutus</i>, hellgrammite, male. (From Riley.)
Richard Hertwig
<cite class="book" style="font-style:normal" id="Reference-Hertwig-1909">Hertwig, Richard (1909)      <i> A Manual of Zoology</i>, <a href="https://en.wikipedia.org/wiki/en:Category:New_York" class="extiw" title="w:en:Category:New York"><span title="Wikimedia category">Category:New York</span></a>:  Henry Holt and Company, p. 482  <small></small></cite>