Winging It: What Species is Tilley’s Butterfly?

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_Pollux writes_:
What species is Eustace Tilley’s butterfly?
Back in “May 2009”:http://emdashes.com/2009/05/sempe-fi-on-covers-forgotten-l.php I posited the suggestion that Tilley’s nameless butterfly, which to me symbolizes creative inspiration, is a
“Clouded Sulphur”:http://www.mariposasmexicanas.com/colias_philodice_eriphyle.htm, whose scientific name is _Colias philodice_. The Clouded Sulphur’s range includes New York. Is it possible Rea Irvin had a specific butterfly in mind?
Perhaps not. Tilley’s Butterfly, of course, is a symbol rather than a literal depiction of a specific butterfly species, but it’s fun to play the amateur lepidopterist.
What do you think?
At Emdashes we like to speculate and theorize about things like this. It gives us wings. If any professional lepidopterists are reading this, we’d also love for you to share your thoughts.