In the February number of the Canadian Entonomoligist, Mr.Dyar very justly complains of the inadequacy of my descriptions of the above genera in Proceedings of the Zoological Society of London, for 1892. Both Preptos and Tamphana belong to the Eupterotidæ. Preptos is most closely allied to theEastern genus Tagora, walk., and differs in the following particulars:—Primaries with veins 5 and 6 from upper angle of cell, discocellulars angled outwardly and then inwardly close below vein 5; secondaries with discocellulars very obiique. No allied forms of Preptos oropus have as yet been discovered in America, although the species has been redescribed as Tagora corax Druce, Proc. Zool. Soc., London, 1893.