Sir,—I am much interested in Mr. Slingerland's note on the new popular name for Clisiocampa disstria in the Canadian Entomologist for January. I once wrote an editorial for “Insect Life” on popular names (Vol. VII., pp. 363, 364), in which I gave utterance to a certain distaste for “book names” and to a preference for the popular name which grows up among the people. Such names are rarely specifically distinctive, but they are usually catchy, frequently phonetic, and more or less descriptive.