Polia nugatis (Smith, 1898)

Mamestra nugatis Smith, 1898, Proceedings of the Entomological Society of Philadelphia 3: 240. Type-locality: USA, Montana.

Taxonomic notes. A species restricted to the mountainous western parts of the Nearctic in the U.S. and Canada. It has long been considered as conspecific with the former species but is differentiated in genitalia of both sexes (MCCABE 1980) and co-occurring with P. purpurissata in most parts of its range.