| Summary: | The long-horn bee genus <i>Tetralonia</i> consists of 35 Western Palaearctic species that are associated mostly with the family Asteraceae as host plants. A minority of the species are, however, exclusively associated with other host plants that have particularly large pollen grains, such as those in the plant families Caprifoliaceae, Malvaceae, and Onagraceae. This work presents a taxonomic account and morphological description of the assemblages of <i>Tetralonia</i> species with atypical (non-Asteraceae) host plants. It includes a key to the <i>pollinosa</i>-group, which contains most of the species, a description of three regionally restricted new species, namely <i>T. eoacinctella</i> Dorchin <b>sp. nov.</b>, <i>T. epilobii</i> Dorchin <b>sp. nov.</b>, and <i>T. stellipilis</i> Dorchin <b>sp. nov.</b>, a lectotype designation for <i>Eucera cinctella</i> Saunders, 1908 [=<i>Tetralonia cinctella</i> (Saunders, 1908)], and a neotype designation for <i>Apis malvae</i> Rossi, 1790 [=<i>Tetralonia malvae</i> (Rossi, 1790)]. In addition, the name <i>Eucera macroglossa</i> Illiger, 1806 is confirmed as a synonym of <i>Apis malvae</i> Rossi, 1790; <i>Tetralonia macroglossa</i> ssp. <i>xanthopyga</i> Alfken, 1936 is officially placed in synonymy with <i>Apis malvae</i> Rossi, 1790; and <i>Macrocera confusa</i> Pérez, 1902 is listed as a doubtful synonym of <i>Tetralonia scabiosae</i> Mocsàry, 1879 (<b>syn. nov.</b>).
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