In Sir George Hampson's volume on the Syntomids, Cat. Lep. Phalænæ, Vol. I., London 1898, Ctenucha Cressonana is referred as a synonym to C. venosa, but erroneously so. Both species inhabit our Nort American territory, but C. venosa has the wider and more southern range, extending probably from Arizona, through Mexico, into South America. I know C. Cressonana from Colorado and New Mexico only; this larger form is also variable in the colors of the stripes of the wing, whereas C. venosa is quite constant, so far as the examples I have been able to examine are concerned.