Published online by Cambridge University Press: 31 May 2012
For many years the true members of the illibalis group (usually placed in the wastebasket genus Pyrausta) have been listed as two or three species, under the names gracilalis Hulst, illibalis Hübner, and arsalteulis Walker. I was considerably surprised, therefore, to find several additional species standing, for the most part unrecognized, in North American collections. A further species, haedulalis Hulst, was compared by its author to gracilalis, and was placed by McDunnough (1939) between gracilalis and illibalis; I have seen the badly damaged tvpe of haedulalis in the collection of Rutgers University, and am convinced ihat the species does not belong in the present group.