Figure 8 in An illustrated key to powder post beetles (Coleoptera, Bostrichidae) associated with rubberwood in Thailand, with new records and a checklist of species found in Southern Thailand

Figure 8. Head and pronotum of Heterobostrychus pileatus Lesne, 1899 (frontal view, a-male, b-female), and Heterobostrychus unicornis (Waterhouse, 1879) (c-male, frontal view; d-female, lateral view). Lateral view of male elytral declivity (e-H. pileatus, f-H. unicornis).