For many years I have collected diurnal Lepidoptera in the neighbourhood of Albany, N.Y., making a special study of established varieties, sports and minor vatieties within the species.

Among the Lycœnidœ the forms which have proved of greatest interest from this point of view are those afforded abundant material for investigation, and I.irus in particular has afforded abundant material for investigation, and long ago I was enabled to recognize several tendencies in the distribution of colour over both the wings and body, which made it possible to separate this species into groups or form-series.