Agabus, Leach, 1817

Watanabe, Kohei, Kamite, Yuuki, Takechi, Leo & Hayashi, Masakazu, 2025, Description of the instar III larva of Agabus (Acatodes) browni Kamiya, 1934 (Coleoptera: Dytiscidae, Agabinae), Zootaxa 5618 (2), pp. 275-283 : 279-280

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