Key to species of Lepanus australis species group.

1. Front edge of protibiae truncate (Fig. 1 A–B), apical digit short and triangular in males and absent in females, apical spur absent in males and present in females where it arises directly from the front edge; central Queensland, Eungella area.......................................................................... Lepanus eungella Gunter & Weir, new species

- Front edge of protibiae deeply angulate (Fig. 1 C–D), apical digit elongate in both males and females, apical spur absent in males and present in females where it arises from apical digit.................................................. 2

2. Elytra with striae 1–7 impressed, appearing as double lines (Fig. 2C); head and disc of pronotum with obvious dense punctures; metanepisternum reticulate and with a row of obvious punctures (Fig. 1E); male metafemora expanded medially (Fig. 1H); metatibiae with inner edge curved, more so in male than female; aedeagus as in Fig. 3C); northern Queensland, Wet Tropics............................................................. Lepanus dukungarri Gunter & Weir, new species

- Elytra with striae more superficial, striae 1–3 or 1–4 appearing as double lines, striae 5–7 appearing single; head and disc of pronotum with punctures less obvious and less dense; metanepisternum either reticulate or with a row of punctures, but never both together; metafemora not expanded medially; metatibiae with inner edge almost straight......................... 3

3. Basal carina of head present, interrupted in the middle (Fig. 1I); eye canthus not dividing eye; elytral epipleura not reticulate, lower edge curving upwards to meet lateral carina of elytra basally (Fig. 1G, grey arrow); metanepisternum smooth, with a row of very fine punctures (Fig. 1G, white arrow); abdominal ventrite 6 virtually impunctate; southeastern Queensland ......................................................................... Lepanus oxleyi Gunter & Weir, new species

- Basal carina of head absent; eye canthus dividing eye; elytral epipleura reticulate throughout, lower edge not curving upwards to meet lateral carina of elytra basally (Fig. 1F); metanepisternum reticulate, not punctate; abdominal ventrite 6 with discernible punctures............................................................................................ 4

4. Elytra black or dark brown with red humeri (Fig. 2B); pronotum with punctures along basal margin circular, similar to those adjacent on disc; elytra with neither striae 6 or 7 reaching basal margin, ending in the red humeral patch and parallel to each other at this point; southeastern Queensland ............................ Lepanus burnetti Gunter & Weir, new species

- Elytra uniformly black or brown; pronotum with punctures along basal margin somewhat elongate, different to those adjacent on disc; elytra with stria 6 reaching basal margin, stria 7 not reaching basal margin and converging towards stria 6 basally... ................................................................................................... 5

5. Lateral lobe of metaventrite with inner border beside mesocoxae anteriorly curving to meet lateral border (Fig. 1J); mesepimeron usually smooth; pygidium with minute unevenly distributed punctures, often appearing impunctate (Fig. 4E); aedeagus as in Figs 3E; northern Queensland, Wet Tropics................................... Lepanus latheticus Matthews, 1974

- Lateral lobe of metaventrite with inner border next to mesocoxae anteriorly straight, lateral border virtually absent (Fig. 1F); mesepimeron usually reticulate; pygidium with discernible punctures, evenly distributed (Fig. 4A); aedeagus as in Figs 3A; southeastern Australia from central Queensland (St Lawrence) to Victoria (Mallacoota)...................................................................................................... Lepanus australis Matthews, 1974