In a recent note (1938, Canadian Entomologist, LXX, 128) I suggested that this name should be applied in a strict sense to the species the larva of which feeds on Aster and Grindelia, but hesitated to separate the Balsamorrhiza feeder as a distinct species owing to lack of material; I had, however, called attention (1936, Canadian Entomologist, LXVIII, 63) to certain differences in the setal structure of the pupal cases which warranted further investigation.