Catocala semirelicta
Introduction '''''Catocala semirelicta''''', the '''semirelict underwing''',  is a moth of the family Erebidae. The species was first described by Augustus Radcliffe Grote in 1874.It is found in North America from  Nevada, Colorado, Utah, California, and Nova Scotia south to Maine, west across Canada to British Columbia, and southward in the mountains.IllustrationThe length of the forewings is about 30 mm. The wingspan is 65–75 mm.Adults are on wing from July to September in one generation depending on the location. The larvae feed on ''Populus balsamifera'', ''Populus tremuloides'', and ''Salix'' species. There is probably one generation per year.
Subspecies *''Catocala semirelicta semirelicta'' Grote, 1874*''Catocala semirelicta hippolyta'' Strecker, 1874The latter is sometimes considered a distinct species.
References
External links *Oehlke, Bill  "''Catocala pura'' = ''semirelicta'' Hulst, 1880". ''The Catocala Website''. Archived August 21, 2012. **Oehlke, Bill  "''Catocala semirelicta'' Guenee, 1852". ''The Catocala Website''. Archived September 14, 2009. *Oehlke, Bill  "''Catocala nevadensis'' = ''semirelicta'' Beutenmüller, 1907". ''The Catocala Website''. Archived August 21, 2012.