Helopini

Key to the genera of New World Helopini 1. Gena with longitudinal groove starting from anteroventral margin of eye and running posteriorly, groove is separate from marginal groove of eye; head in dorsal view with eye more rounded, length along lateral margin of head subequal to width of visible eye from lateral margin towards vertex................................................ Nalassus Mulsant 1’. Gena without longitudinal groove, eye may or may not have marginal groove; head in dorsal view with eye narrower, length along lateral margin of head about half the width of visible eye from lateral margin towards vertex........ Dinomus Brême