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Sphinx poecila (et al?) - Sphinx gordius

Sphinx poecila (et al?) - Sphinx gordius
Mountain Iron, St. Louis County, Minnesota, USA
July 20, 2012
Look closely. The caterpillar may be infected by a parasitoid. Are the white ovoid objects on its skin the eggs or pupas of a fly or wasp?

Moved from Clemens' Sphinx.

Moved to Sphinx gordius
This is not Sphinx luscitiosa. The head capsule is too light and the streaks nearest the black aren't really yellow, but rather a light green. S. lucitiosa generally has lots of stippling which this larva lacks. The spiracles are also black, which is incorrect for luscitiosa.

My best guess for this larva is Sphinx gordius

Moved- Sphinx luscitiosa
Moved from ID Request.

Due to the lack of stippling on this larvae and the dark coloration above the diagonal lateral lines, this individual is most likely Sphinx luscitiosa, a species rather rarely seen in its larval form. This is only the second larval image for the guide, nice find!

The white ovals you mention are in fact those of a parasitoid, likely a dipteran parasitiod (such as a tachinid fly).

---note however, there is still a possibility that this is S. poecila, but I am definitely leaning more towards the less common S. luscitiosa.

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