Since the issue of the Check List of N. A. Coleoptera by the late Mr. G. R. crotch, I have been asked by several persons interested in that branch of science, if I would advise them to change the labels in their collections in accordance with the nomenclature of several familiar genera as therein set forth. To all such applicants I have answered, that such changes are not expedient, unless they are fully, convinced of the propriety of admitting them. For my part, I considered them quite unnecessary, and still further, contrarry to the code of laws of nomenclature under which I supposed we were acting.