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Amorpha juglandis
Brown and tan markings with around 1 1/2 in wing span.
Sighted in town
This looks like one of the Smerinthini species of sphinx moths but I don't know the exact one. Here is a checklist of moths for Indiana http://www.butterfliesandmoths.org/check... you may be able to find a match under Sphingidae (Sphinx Moths, Hawkmoths)