A cleanup effort for taxonomy of the Central European species of the genus Thinobius Kiesenwetter, 1844 resulted in a series of previously unpublished synonymies. The new edition of “Die Käfer Mitteleuropas, Band 4” interpreted the names in their correct identities,but the research that lead to these could not be presented there in detail, in part also because of extralimital taxa involved, this is supplied with the present contribution. One species is described as new to science: Thinobius paramicros sp. n. (Algeria: Tamanrasset),
for earlier erroneous use of T. algiricus Fauvel. The following new synonymies are proposed: T. angusticeps Fauvel, 1889 = Thinobius (Thinophilus) allocerus Eppelsheim, 1893, syn.
n., = Trogophloeus alaskanus Fall, 1926, syn. n., T. major Kraatz, 1857 = Thinobius diversicornis Fauvel, 1889, syn. n., = Thinobius sahlbergi Scheerpeltz, 1959, syn. n., T. micros Fauvel, 1871 = Thinobius algiricus Fauvel, 1898, syn. n., T. petzi Bernhauer, 1908 = Thinobius tingitanus Peyerimhoff,
1925, syn. n., = Thinobius (Thiphonilus) anatolicus Smetana, 1967, syn. n. T. procerus Eppelsheim, 1893 = Trogophloeus teres Fall, 1926, syn. n., and lectotypes are designated for
the following ten nominal species: Thinobius micros Fauvel, 1871, Thinobius diversicornis Fauvel, 1889, Thinobius (Thinophilus) allocerus Eppelsheim, 1893, Thinobius (Thinophilus)procerus Eppelsheim, 1893, Thinobius algiricus Fauvel, 1898, Thinobius silvaticus Bernhauer, 1899, Thinobius bicolor Joy, 1911, Thinobius longicornis Joy, 1913, Thinobius franzi Scheerpeltz, 1947 and Thinobius peezi Scheerpeltz, 1957. A neotype for Thinobius angusticeps Fauvel, 1889 is designated from France (Alpes-Maritimes)
