Agabus Leach 1817

Key to instar III larvae of Agabus species from Honshu and western Japan 1. Body small; head length approximately 1.6 mm; head width approximately 1.3 mm. Abdominal segment VIII with only short setae....................................................................... Agabus japonicus Sharp, 1873 - Body large; head length approximately 2.0 mm; head width approximately 1.7 mm. Abdominal segment VIII with short and long hair-like setae.................................................................................... 2 2. Frontoclypeus with several small dark brown maculae and a large cross-shaped macula centrally................................................................................................. Agabus conspicuus Sharp, 1873 - Frontoclypeus almost entirely yellow-brown, with a diamond-shaped dark brown macula centrally................................................................................................. Agabus browni Kamiya, 1934