Definition of the jianfengling species group of the ground beetle genus Orthogonius MacLeay (Coleoptera, Carabidae, Orthogoniini)

The jianfengling species group of the termitophilous carabid genus Orthogonius MacLeay, 1825 is defined and reviewed. This species group ranges from southern China, crossing Indochina and Myanmar to eastern India. To date, the jianfengling species group is composed of ten species, including six new species which are hereinafter described and illustrated: Orthogonius wrasei sp. n. (Myanmar), Orthogonius bellus sp. n. and Orthogonius limbourgi sp. n. (Vietnam), Orthogonius politior sp. n., Orthogonius aberlenci sp. n. (Laos) and Orthogonius meghalayaensis sp. n. (India). Habitus, elytral apices and male genitalia of all species are illustrated. A key to species and a distribution map of jianfengling species group are provided.