A checklist of the bees of the genus Hylaeus Fabricius, 1793 of Iran, based on the literature data and also field surveys in northeastern Iran (North Khorasan and Khorasan-e Razavi provinces) is presented. The resulting checklist comprises nine subgenera and 63 species. Four species of the genus Hylaeus, including H. (Lambdopsis) rinki (Gorski, 1852), H. (Spatulariella) hyalinatus Smith, 1842, H. (Spatulariella) punctatus (Brullé, 1832) and H. (Prosopis) lionotus (Alfken, 1909), are newly recorded for the fauna of Iran. The later species is considered as ″ very rare″ , has only known in Kazakhstan. A redescription of the male of H. (Prosopis) lionotus together with the illustrations of morphological characters is given.

All three hitherto described species of the Palearctic subgenus Andrena (Longandrena Osytshnjuk, 1993), are revised and redescribed. This subgenus is characterized by an unusually long glossa, a rare character among short-tongued bees. A revised diagnosis of this subgenus is given. A key to the species of A. (Longandrena) is provided, and all diagnostic morphological features are illustrated in detail. The Central Asian species Andrena longiceps Morawitz 1895 is recorded for the first time from Iran. The distribution map of the subgenus is also presented.

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