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Spicebush OR Black Swallowtail? An Underwing Guide

Posted by jrcagle z7 MD (My Page) on
Sat, May 21, 11 at 2:48

This may be redundant, but the question sometimes comes up: Spicebush or Black Swallowtail?

These two newly hatched individuals were seconds away from release and decided to pose for an educational poster.

Spicebush Swallowtail Papilio troilus
* Is usually large
* Has "blue comet" mark that pushes through the orange spots in the disc.
* Has small orange spot with no black eyespot at bottom of submargin.
Photobucket

Black Swallowtail Papilio polyxenes
* Is usually smallish
* Has complete row of orange spots in disc
* Has large orange spot with black eyespot at bottom of submargin.
Photobucket


Follow-Up Postings:

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RE: Spicebush OR Black Swallowtail? An Underwing Guide

Great idea, how very useful, thanks.


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RE: Spicebush OR Black Swallowtail? An Underwing Guide

Great instructional pictures, Jeff!
To me, the black spot in the red circle is totally diagnostic - black swallowtails have a hangover. :)
Sherry


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RE: Spicebush OR Black Swallowtail? An Underwing Guide

Well, this is so very useful!! Thank you for posting this. It will help me with a much quicker ID in the yard.~~Angie


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