Other Information
There is a high amount of variation within this species. The colors of the adult are always yellow and purple but can vary distinctly on this. Generally there is more purple on the forewing and more purple on males. However, one subspecies tends to have a distinct coating of purple over the entire wings.
Darker, heavily mottled individuals are typical forms of the southern and western range and may represent a clinal variation of nominate imperialis. Subspecies pini to the north, and sibling species Eacles oslari to the southwest exhibit similar morphs. Regional foodplant preferences have been noted as well, although captive-bred populations from all sources are nearly omnivorous.
The Imperial Moth is perhaps the only example of such a creature as a character in a novel. Naturalist Gene Stratton Porter's "Girl Of The Limberlost" features imperialis prominently in the plot development, and her account of its life history in "Moths Of The Limberlost" (a chronicle of her discovery of lepidoptera in early 20th Century rural Indiana) captures not just the science but the charm of the giant silk moths and childhood discovery of nature.
Read more about this topic: Eacles Imperialis
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