FIGURES 1−9. Calvarium spp., head morphology. 1–5, C in Australian Marsh Beetles (Coleoptera: Scirtidae). 6. Genera Calvarium Pic, Papuacyphon Zwick, and Ypsiloncyphon Klausnitzer

FIGURES 1−9. Calvarium spp., head morphology. 1–5, C. (C.) australiense, n. sp.; 6–9, C. (Calvariellum) hamifer, n. sp.: 1, 6, ventral views of mounted heads; 2, left mandible, dorsal view; 3, labrum; 4, maxillary palpus; 5, labium; 7, frontal view, slightly from ventral side, diagrammatic, right antenna removed; 8, maxillary palpus; 9, labial palpus. Figures 2–5 and 8, 9 to the same scale, respectively; Fig. 7 not to scale. Abbreviations: af, antennal foramen; as, accessory suture; asu, antennal sulcus; la, labrum; md, mandible; sgr, subgenal ridge; sor, subocular ridge; trs, transverse suture.