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This paper presents data on bees of the families Megachilidae and Apidae (Apoidea) of the proposed nature reserve “Skarpa Wiœlana” in Mêæmierz (Kazimierski Landscape Park). Distributional and phenological data are given. Thirty-one species of Megachilidae and forty-three species of Apidae were collected. For rare and very rare species (Anthidium oblongatum (I LLIGER , 1806); Heriades crenulatus N YLANDER , 1856; Hoplitis claviventris (T HOMSON ,1872); Hoplitis papaveris (L ATREILLE , 1799); Megachile genalis M ORAWITZ , 1880; Osmia cerinthidis M ORAWITZ , 1876; Stelis odontopyga N OSKIEWICZ , 1926; Stelis ornatula (K LUG ,1807); Epeoloides coecutiens (F ABRICIUS , 1775); Eucera interrupta B AER , 1850; Nomada bifasciata O LIVIER , 1811; Nomada stigma F ABRICIUS , 1804; Nomada zonata P ANZER , 1798) this paper summarizes information about their distribution in 21st century in Poland, as well as data on their bionomics and their present status of threat in Europe.