FIGURES 18–22. Acilius sinensis Peschet, 1915, instar II in Larval morphology and new records of the iconic diving beetle Acilius sinensis Peschet, 1915 (Coleoptera: Dytiscidae: Dytiscinae)-a species well established in western Yunnan, China

FIGURES 18–22. Acilius sinensis Peschet, 1915, instar II: 18. parietale, ventral aspect; 19. mandible, dorsal aspect; 20. maxilla, dorsal aspect; 21. metathoracic leg, anterior surface; 22. metathoracic leg, posterior surface. Scale bars = 0.5 mm (Fig. 18); 0.2 mm (Figs 21–22); 0.1 mm (Figs 19–20).