About Catocala ultronia Hübner, 1823
Catocala ultronia, commonly known as the dark red underwing or the ultronia underwing, is a species of moth that belongs to the family Erebidae. This species was first formally described by Jacob Hübner in 1823. It can be found across most of eastern North America, with its southern distribution extending to Florida and Texas. To the west, its range stretches across southern regions of Canada, reaching as far as extreme southeast British Columbia. The wingspan of adult individuals ranges from 46 to 60 mm. Adults are active in August, and the species produces one generation per year, with timing varying depending on location. The larvae of this moth feed on Fraxinus pennsylvanica, Malus species, Populus grandidentata, Prunus pensylvanica, Prunus serotina, Prunus virginiana, and Tilia americana.
