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Photo#557672
Caterpillar gathering_2011 - Ceratomia undulosa

Caterpillar gathering_2011 - Ceratomia undulosa
Brushy Creek Recreation Area , Webster County, Iowa, USA
July 30, 2011
Size: 2 in +/-
Found waist high on sparse bush in field.

Images of this individual: tag all
Caterpillar gathering_2011 - Ceratomia undulosa Caterpillar gathering_2011 - Ceratomia undulosa

Moved
Moved from Sphinx.

Appears to be
The Waved Sphinx Ceratomia undulosa, I just can't tell what host plant this is. C. undulosa feeds on ash and related splecies (i.e. lilac).

 
Green Ash
I see an intersection of three "leaves" at Nancy's thumb in her first photo, representing the junction of three leaflets (one terminal plus two laterals) of a compound leaf. The serrate edges of the leaflets indicate ash (Fraxinus) and the open habitat suggests Green Ash (F. pennsylvanica) in particular; it is a common invader of old fields at this site.

 
After the fact...
I was looking up green ash shortly after posting this, you're right, which would certainly support my original ID.

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