Dr. Horn in his revision of the Galerucini places erosa, morosa and maritima as plain synonyms with puncticollis with the remark that no tangible difference seems to exist. In this he is wrong for on comparing typical puncticollis from Colorado, N. Dakota, etc. with maritima from the Atlantic coast the differences are very obvious. The latter have the prothorax much less roughly sculptured, more smooth, the elytral punctures are larger and more densely placed and the elytral pubescence generally scarcely visible, at least more easily abraded than in the typical form.