S. Mahunka szerk.: Folia Entomologica Hungarica 62. (Budapest, 2001)

8 (7) Differently coloured. 9 (10) Longitudinal lines on middles lobes of mesonotum and longitudinal lines on the sides of the lateral lobes and tegulae red. Penis valve in Fig. 1. 8.0 mm. D. rubrosignalis sp. n. 10 (9) Only the outer angle of the middle lobe of mesonotum with dark red spot. Penis valve in Fig. 2. 8.5 mm. D. takaosanensis sp. n. 11 (6) Thorax, except cenchri, entirely black or with greenish blue iridescence but never with red spots. 12 (15) Body with strong bluish green or bluish black metallic luster. The following two species can be separated only by their penis valves figured in Haris 2000. (D. hordei Rohwer male unknown.) 13 (14) Penis valve concave ventrally, as figured in Haris 2000, Fig. 136. 6.5-8.0 mm. D. lewisii Cameron 14 (13) Penis valve angulary broken, as it figured in Haris 2000, Fig. 137. 6.5-8.0 mm. D. coreanus Takeuchi 15 (12) Body without metallic luster. 16 (17) Penis valve in Fig. 3. See the descreption above. (Female unknown. 8.0 mm.) D. honshuensis sp. n. 17 (16) Penis valve in Haris 2000, Fig. 148. 8.5-9.0 mm. D. yokohamensis Rohwer 18(1) Abdomen more or less red, if entirely black, than mesopleuron with crater-like punctures (except D. harukawai Waterston which has black abdomen and rough but not crater-like punctures). Abdominal tergites without transverse surface sculpture (except D. gessneri Ed. André). 19 (20) Abdomen more or less covered with transverse sculpture. Mesopleuron with crater-like punctures (punctures larger than abdominal spiracles). Entirely black species. Penis valve in Haris 2000, Fig. 180. 9.0-10.0 mm. D. gessneri Ed. André 20 (19) Abdomen smooth and shining. 21 (28) Legs more or less red, at least the first knees. 22 (23) Abdomen red, first and last abdominal tergites black. Penis valve in Haris 2000, Fig. 189. 7.0-9.0 mm. D. germanicus (Fabricius) 23 (22) Abdomen black or with dark reddish brown shadow-like band (D. japonicus Kirby).