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Photo#16236
spiny humped caterpillar - Limenitis archippus

spiny humped caterpillar - Limenitis archippus
London, Middlesex, Ontario, Canada
July 10, 2004
Size: about 15 mm
On edge of damp meadow. Viceroy and Red-spotted Purple adults were seen in the area. Can you tell which species this is?

subspecies archippus
Moved from Viceroy to Eastern Viceroy.

small humps and lots of spines
according to the new posts this would be archippus. And a wet meadow might have willow, one of the foods of archippus. The plant in the photo even looks like a willow.

 
horns look a little short
but otherwise a good archippus- moved to page

I would love to know
This guide (1) has clear pictures and text that seem to differentiate between the L. arthemis astyanax and L. archippus by the presence of absence of spine clusters on certain segments. However, a quick check of larval photos from other sources (2)(3) doesn't seem consistent. You never know how careful the photo researchers were so it's hard to say.

If the first thing I mentioned is correct, and assuming that what they say about L. arthemis astyanax applies to L. arthemis arthemis as well, this must be a viceroy (archippus) because it clearly has spiny clusters in key places. Segment A2 seems easiest to check, which is the highest point on your critter in this photo.

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