Plain Sulphur adult, upper- (left) and underwing
A.G.Butler
1865
<i>Proceedings of the Zoological Society of London</i> (<a rel="nofollow" class="external text" href="https://archive.org/details/proceedingsofgen65zool">vol. 1865</a>, <a rel="nofollow" class="external text" href="https://archive.org/stream/proceedingsofgen65zool#page/n531/mode/1up">plate XXVI</a>)