1. Mandibles relatively short, at most half of head capsule length; male abdominal ventrite 5 with transverse elevations near anterior margin; female abdominal ventrite 5 elongate..... H. blackburni

–. Mandibles elongate, longer than half of head capsule length; male abdominal ventrite 5 without transverse carinae near anterior margin; female abdominal ventrite 5 transverse...................... 2

2. Pronotal disc at least with some shiny and smooth area medially; mostly known from Queensland and New South Wales; male antennae longer, extending beyond the middle of elytra, erect long setal area on abdominal ventrites 1–4 longer, width over 2/3 of ventrite width..................... H. princeps

–. Pronotal disc uniformly densely and deeply punctate, without smooth area medially; mostly known from Western Australia; male antennae shorter, only extending to the middle of elytra, erect long setal area on abdominal ventrites 1–4 shorter, width about half of ventrite length..... H. mandibularis