The typical genus of the family—a general favorite with collectors and the source of a good deal of worry and uncertainty to describers. I have seen very large series of specimens of many species, and have seen nearly all the species. From a rather careful study of the species I can see no reason why they should not be as easily recognizable or limited as those of any other Lepidopterous genus—indeed, the problem strikes, me as a remarkably easy one, the key to which lies in the fact that no amount of obsolescence of maculation authorizes a species, while change of pattern can be easily detected even in speciments with the markings much broken.