Though the larvæ and life-histories of several species of the Chrysomelid genus Donacia have been described more or less fully by European entomologists, I have been able to find but one such note in American entomological literature. In 1877 Dr. A. S. Packard gave a brief description of the larva and life-history of Donacia cincticornis, Newm., var. proxima, Kby., in the report of the U. S. Geological Survey for that year (p. 806), together with figures of the larva and cocoon (Pl. LXX., figs. 17–19) which he found on the roots of Nuphar advena.