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Micromorphometric analyses of genital capsules and comparison of adult cuticular reflectance of two species of Chrysina Kirby (Coleoptera: Scarabaeidae: Rutelinae) support the status of C. valentini Zubov and Ivshin, 2019 as a valid species. Compared with its closest relative C. optima (Bates, 1888), capsules of C. valentini are proportionately wider at the base of the parameres than those of C. optima, and taper toward the apex more abruptly. Reflectance of C. valentini under natural light appears slightly greenish while C. optima is uniformly reddish. The number of teeth on the protibia and the shape of the mesosternal process, characters cited by Zubov et al. (2019) to distinguish the two species, did not prove reliable.
The approximate type locality of Chrysina adelaida (Hope, 1841) (Coleoptera: Scarabaeidae: Rutelinae) is fixed in the mountains of southeastern Mexico. Chrysina occidentalis Robacker and Hawks is described as a new species from the Sierra Madre Occidental in northwestern Mexico based on morphometric comparisons of adults and genital capsules with those of C. adelaida from southeastern Mexico and with those of C. adelaida (of authors) from neighboring states south of the Sierra Madre Occidental.
ZooBank registration. urn:lsid:zoobank.org:pub:E123E40A-5776-4C75-90E6-6131E5C3AA32