| Summary: | In Sardinia, the second largest Mediterranean island, 316 species of bees are known. Here, for the first time, the following 20 <i>taxa</i> are reported: <i>Colletes cunicularius</i> (Linnaeus, 1761), and <i>C. eous</i> Morice, 1904 (Colletidae); <i>Andrena humilis</i> Imhoff, 1832, <i>A. granulosa</i> Pérez, 1902, <i>A. cineraria</i> (Linnaeus, 1758), <i>A</i>. <i>pallitarsis</i> Pérez, 1903, <i>A. rugulosa</i> Stöckhert, 1935, <i>A. savignyi</i> Spinola, 1838, and <i>A. tenuistriata</i> Pérez, 1895 (Andrenidae); <i>Sphecodes reticulatus</i> Thomson, 1870 (Halictidae); <i>Lithurgus tibialis</i> Morawitz, 1875, <i>Chelostoma emarginatum</i> (Nylander, 1856), <i>Dioxys cinctus</i> (Jurine, 1807), <i>Coelioxys caudatus</i> Spinola, 1838, <i>C. obtusus</i> Pérez, 1884, and <i>Megachile ericetorum</i> (Lepeletier, 1841) (Megachilidae); and <i>Nomada melathoracica</i> Imhoff, 1834, <i>N. pulchra</i> Arnold, 1888, <i>Eucera proxima</i> Morawitz, 1875 and <i>Tetralonia malvae</i> (Rossi, 1790) (Apidae). <i>N. pulchra</i> is reported for the first time in Italy.
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