Several years ago it occurred to me that a knowledge of the earlier stages in the lives of some of our Diurnal Lepidoptera might possibly be arrived at by obtaining eggs from impregnated females in captivity. My experiments began with the Hesperidæ as offering the greatest probability of success. As many females as could be procured (beaten ones preferred, as the likelihood of their impregnation was greater) were confined in separate boxes some with glass tops admitting right. others darkened. My success was greater than I had anticipated, but none attended the use of boxes where much light was admitted. whether the failure in the latter case was really due to the admission of light, I am not prepared to say ; the number of glass-covered boxes used was not proportionally large nor was their use long continued.