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Photo#570204
Large caterpillar in Harney county, OR - Pachysphinx

Large caterpillar in Harney county, OR - Pachysphinx
Burns, OR, USA, Harney County, Oregon, USA
August 30, 2011
Size: 5 inches
We found this fellow in our aspen tree and are curious what he is. Thanks in advance for any help.

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comment deleted

I would expect Pachysphinx occidentalis
in that part of the world, but I'm not sure.

Moved
Moved from Sphinx Moths.

Moved
Moved from ID Request.

its a modest sphinx cat
Modest Sphinx - Hodges#7828 (Pachysphinx modesta)
Photo#560828
the anal horn is greatly reduced in the last instars, whereas the horn of cheris is blue. this will be a big un.

 
Thank you for the ID help :-)
Thank You.

I think it is
Sphinx chersis, but I'm not 100% positive.

 
Thanks for the ID help :-)
Thank you.

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