Diochus Erichson 1839

Key to species of Australian Diochus 1 Antennomeres 4−10 uniformly colored.................................................................... 2 - Antennomeres 4−10 not uniformly colored, gradually lightened toward apex...................................... 4 2 Antennae long, if flexed backward, reaching posterior margin of pronotum; antennomere 4 distinctly elongate, about 3 times longer than wide; body paler, with pronotum and elytra yellowish brown; body large, with length 5.2−6.3 mm ................................................................................... (Fig 2-1A) Diochus basseti sp. nov. - Antennae shorter, backward reaching about pronotum half; antennomere 4 slightly elongate, about 2 times longer than wide or less; body more darkly colored, with pronotum and elytra reddish brown to black brown; body smaller, with length: 3.8−4.4 mm ................................................................................................ 3 3 Antennomeres 4−10 transverse, distinctly widened toward apex................................ (Fig 7) D. longus Lea - Antennomeres 4−10 not transverse, slightly widened toward apex...................... (Fig 5-1A) D. slipinskii sp. nov. 4 Elytra not uniformly colored, at least apical margin pale....................................................... 5 - Elytra uniformly colored, dark brown to black brown......................................................... 6 5 Elytra with half or more pale....................................................... (Fig 6-1) D. divisus Fauvel - Elytra with apical margin pale......................................................(Fig 9-1) D. pubiventri s Lea 6 Posterior margin of male sternite VIII with wide and shallow emargination in middle, without any thick and short setae.... 7 - Posterior margin of male sternite VIII without wide and shallow emargination in middle, but nearly straight, with a row of thick and short setae (Fig 8E)............................................................ (Fig 8A) D. octavii Fauvel 7 Posterior margin of male sternite VIII with only one emargination in middle, rounded at both sides (Fig 3-1E)...........................................................................................(Fig 3-1A) D. weiri sp. nov. - Posterior margin of male sternite VIII with an emargination in middle, each side with shallower emargination, acute on both sides (Fig 4-1E)............................................................. (Fig 4-1A) D. lawrencei sp. nov.