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The Lesser Diving Beetle (Acilius sulcatus) is of the family Dytiscidae which is in the genus Acilius. Also known as the Grooved Diving Beetle, it occurs on all continents of the world except Antarctica. In Ireland this water beetle has a very scattered distribution but as in other countries it is probably under recorded due to its aquatic life style. Separate with care from the almost identical but rarer Acilius canaliculatus by differences in face pattern. As a strong flier, it is not confined to a single body of water. It overwinters deep under water as an adult.
Patrick J. O'Keeffe / Raw Birds