Of the three families of Saturnina found in North America, only the Saturnidæ occurs in the European fauna. Conversely no analogue of the European Aglia tau* has been found in America. In a very interesting paper, Ann. Mag. N. Hist., Vol. XI., 1893, Dr. Packard says of this species: “Aglia appears to be a Ceratocampid in its earlier larval stages, the caterpillar in its final stage, however, and the moth being closely related to the Saturnians”. This being so, it is clear that Aglia cannot be classed as a subfamily of Cithernidœ, from which the habit and struture of the moth and the mde of pupation seem to exclude it.