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Published online by Cambridge University Press: 31 May 2012
Pyrausta unifascialis (Packard) is the Nearctic representative of 3 closely knit group which ranges throughout the Holarctic Region and into northern South America, and which includes such species as P. aerealis (Hübner), P. limbopunctalis (Herrich-Schäffer), P. sardinialis (Guenée), P. canotinctalis Hampson, P. postalbalis South (=P. aerealis glauculalis Caradja, new synonymy), and P. polygamalis (Snellen). Study of the considerable series of P. unifascialis in the Canadian National Collection shows that four North American subspecies are recognizable, two of them undescribed.