During a recent visit to the Museum of Comparative Zoology at Cambridge, Mass., undertaken primarily for the purpose of studying Chambers' Coleophorid types, I naturally took advantage of the opportunity to examine the numerous types of Geometridae incorporated from the Packard, Swett and Cassino collections. In consequence I was enabled to clear up a number of points which had been worrying me for some time and in the following notes I offer the main results of such studies.