Xestia smithii, or Smith's dart, is a moth of the family Noctuidae. The species was first described by Pieter Cornelius Tobias Snellen in 1896. It is found across northern North America.
References
Pogue, Michael G. (2006). "The Noctuinae (Lepidoptera: Noctuidae) of Great Smoky Mountains National Park, U.S.A." Zootaxa. 1215: 1-95. .