The form alone of these little beetles is amply sufficient for their separation from the other tribes of Chrysomelidæ. They are more or less wedge-shaped, the elytra often broadly and squarely truncate behind and with rows of deep punctures, sometimes costate as well. Only two of the North America genera have been recorded from our territory, Microrhopala, with 8-jointed antennæ (owing to the fact that the last four joints are closely connate), and Odontota, in which the antennæ are 11-jointed. The middle tibiæ are straight in both of these genera.