Revision of the subgenus Orthoscymnus Canepari of Scymnus Kugelann (Coleoptera, Coccinellidae), with descriptions of four new species

The subgenus Orthoscymnus Canepari, 1997 of Scymnus Kugelann, 1794 is herein revised. Seven species of the Orthoscymnus fauna are recognized, of which four species, Scymnus (O.) jilongicus sp. n., S. (O.) paradoxus sp. n., S. (O.) crispatus sp. n. and S. (O.) duomaculatus sp. n., are described as new to science. Scymnus (O.) rhododendri Canepari is recorded from China for the first time. Scymnus (Pullus) robustibasalis Yu is transferred to the subgenus Orthoscymnus (comb. n.). All species are diagnosed, described and illustrated, and distributions are provided for each species. A key to the species is included