Revision of the Agrilus cyanescens species-group (Coleoptera: Buprestidae) with description of three new species from the east Palaearctic region

The Agrilus cyanescens species-group of jewel beetles is defined to include seven species, three of which are newly described: A. dali Jendek sp. n. (China: Yunnan), A. zhongdian Jendek sp. n. (China: Yunnan) and A. arsenevi Jendek sp. n. (Russia: Primorsky Kray). Three new synonyms are proposed for A. cyanescens (Ratzeburg, 1837) (= italicus Obenberger, 1920 syn. n.; = cockerelli Fisher, 1925 syn. n.; = pooli Thery, 1936 syn. n.). Each member of the group is illustrated and an identification key to species, based on males, is provided.