Methods of biogeographic regionalization are discussed. One of these methods is ranging of different territories based on three principles: zonality, sectorality, and provinciality. This primary type of regionalization, established in classical biogeography by P.L. Sclater (1858) and A.R. Wallace (1876), was widely used in phytogeography and zoogeography of insects starting from A.P. Semenov-Tian-Shansky (1936) and developed for the Palaearctic by A.F. Emeljanov (1974). Zonality and sectorality are constructive principles associated with the biospheric abiotic factors and determining the boundaries of major biogeographic entities (not provinces). Provinciality is considered the main principle of biogeography because the province has a predicative status with faunistic substantiation at the species level. Species of a certain provincial fauna can be combined in a group with a particular habitus which may be taken as a characteristic biogeographic “fashion,” or a province-specific style. Examples of such provincial styles for Myrmeleontidae (Neuroptera) and Tephritidae (Diptera) are discussed. These styles can be used for biogeographic indication in parallel with individual indicatory species.