In the preparation of my Catalogue of the Coccidæ I was not able to find where Illiger had proposed or described the genus Lecanium, although Burmeister in his handbook of Entomology, Vol. II., p. 69 (1835), used this genus, giving Illiger as the authority. Burmeister described the genus and placed under it hesperidum, Linn., and several other species. My husband, Prof. C. H. Fernald, wrote to Mr. Theodore Pergande, inquiring if he could give me any information whether Illiger had really published this genus, and if so where it could be found.