Bioacoustics of Diaulota

1. Body black, rarely dark reddish brown.................................................................... 2 – Body brown to reddish brown........................................................................... 7 2. Hypomeron without longitudinal carina, more angulated posteriorly; mentum with deeper anterior emargination; median lobe (fig. 36 in Ahn, 1996 )......................................................................... D. pacifica – Hypomeron with longitudinal carina, less angulated posteriorly; mentum with shallower anterior emargiantion........... 3 3. Elytron wider than long; posterior margin of male sternite VIII crenate; median lobe (fig. 26 in Ahn, 1996 ).... D . fulviventris – Elytron longer than wide; posterior margin of male sternite VIII smooth.......................................... 4 4. Anterior margin of labrum not truncated; median lobe (fig. 7 in Ahn, 1996 ); distributed in the NE Pacific coasts.................................................................................................... D. densissima – Anterior margin of labrum truncated; distributed in the NW Pacific coats and Alaska ................................ 5 5. Pronotum and elytra without distinctively long filiform setae; mandible not pointed; median lobe (fig. 22 in Ahn, 1996 )............................................................................................... D. alaskana – Pronotum and elytra with distinctively long filiform setae; mandible more or less pointed........................... 6 6. Median lobe (fig. 21 in Ahn, 1996 ); distributed in Korea and Honshu ( Japan )................................ D. aokii – Median lobe (figs. 3–4 in Song et al. , 2018 ); distributed in Hokkaido ( Japan ), Kamchatka ( Russia ), and USA ( Alaska )............................................................................................. D. hokkaidona 7. Labrum large and robust; mandible more elongate; labial palpi with 3 distinct articles; ligula with 2 minute setae; metum with shallower anterior emargination; tarsal formula 4-4-4......................................................... 8 – Labrum not large and robust; mandible less elongate; labial palpi with 3 indistinct articles; ligula without minute setae; metum with deeper anterior emargination; tarsal formula 3-3-4 or 4-4-5................................................ 9 8. Antennomeres 6–10 subquadrate; anterior margin of labrum truncated; labial palpomere 1 as wide as 2; median lobe smaller; apical process of median lobe broader; apical internal sclerite rounded (fig. 10L in Sawada, 1971 ); distributed in Japan .................................................................................................. D. uenoi – Antennomeres 6–10 transverse; anterior margin of labrum rounded ( Fig. 3A ); labial palpomere 1 wider than 2; median lobe bigger; apical process of median lobe narrower; apical internal sclerite larger and polygonal ( Fig. 4D ); distributed in Korea ........................................................................................... D. submarina 9. Elytron wider than long......................................................................... D. harteri – Elytron longer than wide.............................................................................. 10 10. Head rounded, as long as wide; antennomeres 8–10 subquadrate; tarsal formula 3-3-4; median lobe (fig. 6 in Yoo and Ahn, 2021 )...................................................................................... D. koreana -– Head oblong, longer than wide; antennomeres 8–10 trransverse; tarsal formula 4-4-5............................... 11 11. Infraorbital carina incomplete, reaching to half of head; median lobe (fig. 42 in Ahn, 1996 ); distributed in California ................................................................................................. D. vandykei – Infraorbital carina complete, reaching to eye; median lobe (fig. 12 in Song et al. , 2018 ); distributed in Hokkaido .. D. oharai