Acronicta falcula. Acronicta falcula (Grote, 1877), A. parallela (Grote, 1879), syn. n., and A. mansueta Smith, 1897, syn. n., do not differ in genitalia or COI mtDNA data and are synonymized here. Specimens from the Pacific Northwest (syn. A. mansueta) tend to have more black shading on the lower margin of the forewing than those from elsewhere. Acronicta falcula was characterized by having the thoracic vestiture mainly of hair-like scales, but the amount of hair-like versus broad scales varies with locality. Recent molecular data from the Barcode of Life Project supports this conclusion.