Megachilidae Schenk, 1860
Osmia adae Bingham, 1897
Osmia adunca (Panzer, 1798)
Osmia aeruginosa Warncke, 1988
Osmia agilis Morawitz, 1875
Osmia alaiensis van der Zanden, 1994
Osmia albiventris Cresson, 1864
Osmia albolateralis Cockerell, 1906
Osmia alfkenii Ducke, 1899
Osmia aliciae Ayala & Griswold, 2005
Osmia alpestris Rust & Bohart, 1986
Osmia alticola Benoist, 1922
Osmia amathusica Mavromoustakis, 1937
Osmia anceps Pérez, 1895
Osmia andrenoides Spinola, 1808
Osmia angustipes Cockerell, 1933
Osmia anthocopoides (Schenck, 1853)
Osmia apicata Smith, 1853
Osmia aquila Warncke, 1988
Osmia argyropyga Pérez, 1879
Osmia ariadne Peters, 1978
Osmia ashmeadii (Titus, 1904)
Osmia atriventris Cresson, 1864
Osmia atroalba Morawitz, 1875
Osmia atrocyanea Cockerell, 1897
Osmia atrorufa Friese, 1913
Osmia aurulenta (Panzer, 1799)
Osmia ausica Cockerell, 1944
Osmia austromaritima Michener, 1936
Osmia avedata Warncke, 1992
Osmia avosetta Warncke, 1988
Osmia azteca Cresson, 1878
Osmia bakeri Sandhouse, 1924
Osmia balearica Schmiedeknecht, 1885
Osmia bella Cresson, 1878
Osmia bicolor (Schrank, 1781)
Osmia bischoffi Atanassov, 1938
Osmia botitena Cockerell, 1909
Osmia breviata Warncke, 1988
Osmia brevicornis (Fabricius, 1798)
Osmia brevipes van der Zanden, 1994
Osmia brevis Cresson, 1864
Osmia bruneri Cockerell, 1897
Osmia bucephala Cresson, 1864
Osmia caerulescens (Linnaeus, 1758)
Osmia cahuilla Cooper, 1993
Osmia calcarata White, 1952
Osmia californica Cresson, 1864
Osmia calla Cockerell, 1897
Osmia capicola Friese, 1906
Osmia cara Cockerell, 1910
Osmia carinoclypearis Wu, 1985
Osmia caulicola Cockerell, 1934
Osmia cephalotes Morawitz, 1870
Osmia cerasi Cockerell, 1897
Osmia cerinthidis Morawitz, 1876
Osmia chalybea Smith, 1853
Osmia chinensis Morawitz, 1890
Osmia chrysaetos Warncke, 1988
Osmia chrysolepta Haeseler, 2005
Osmia cinctella Dours, 1873
Osmia cinerea Warncke, 1988
Osmia cinnabarina Pérez, 1895
Osmia claremontensis Michener, 1936
Osmia clarescens Cockerell, 1911
Osmia claviventris Thomson, 1872
Osmia clypearis Morawitz, 1871
Osmia cobaltina Cresson, 1878
Osmia cockerelli Sandhouse, 1939
Osmia coerulescens (Latreille, 1758)
Osmia collinsiae Robertson, 1905
Osmia coloradensis Cresson, 1878
Osmia concavoclypearis Wu, 1985
Osmia conjuncta Cresson, 1864
Osmia cordata Robertson, 1902
Osmia corniculata (van der Zanden, 1989)
Osmia cornifrons (Radoszkowski, 1887)
Osmia cornuta (Latreille, 1805)
Osmia crassa Rust & Bohart, 1986
Osmia croceiventris Radoszkowski, 1882
Osmia cyanella Cockerell, 1897
Osmia cyaneonitens Cockerell, 1906
Osmia cyanescens Morawitz, 1875
Osmia cyanopoda Cockerell, 1916
Osmia cyanoxantha Pérez, 1879
Osmia cyrenaica Peters, 1978
Osmia dakotensis Michener, 1937
Osmia damascena Pérez, 1911
Osmia decorata Morawitz, 1886
Osmia densa Cresson, 1864
Osmia derasa Pérez, 1895
Osmia difficilis Morawitz, 1875
Osmia dilaticornis Morawitz, 1875
Osmia dimidiata Morawitz, 1870
Osmia diomedia Warncke, 1988
Osmia disjuncta Tkalcu, 1995
Osmia distincta Cresson, 1864
Osmia dives Mocsary, 1877
Osmia dlabolae Tkalcu, 1978
Osmia dolerosa Sandhouse, 1939
Osmia dusmeti van der Zanden, 1998
Osmia ednae Cockerell, 1907
Osmia emarginata Lepeletier, 1841
Osmia enixa Sandhouse, 1924
Osmia ephippiata Smith, 1879
Osmia erythrogastra Ferton, 1905
Osmia excavata Alfken, 1903
Osmia exigua Cresson, 1878
Osmia fasciata Latreille, 1811
Osmia fedtschenkoi Morawitz, 1875
Osmia felti Cockerell, 1911
Osmia ferruginea Latreille, 1811
Osmia fervida Smith, 1853
Osmia flavipes Friese, 1909
Osmia forticornis van der Zanden, 1989
Osmia foxi Cameron, 1901
Osmia francisconis White, 1952
Osmia frieseana Ducke, 1899
Osmia frunseensis Warncke, 1992
Osmia gabrielis Cockerell, 1910
Osmia gallarum Spinola, 1808
Osmia gaudiosa Cockerell, 1907
Osmia gemmea Pérez, 1896
Osmia georgica Cresson, 1878
Osmia giffardi Sandhouse, 1939
Osmia giliarum Cockerell, 1906
Osmia glareola Warncke, 1988
Osmia glauca (Fowler, 1899)
Osmia gracilicornis Pérez, 1895
Osmia granulosa Cockerell, 1911
Osmia grindeliae Cockerell, 1910
Osmia grinnelli Cockerell, 1910
Osmia gulmargensis Nurse, 1903
Osmia gutturalis Warncke, 1988
Osmia haemorrhoa Morawitz, 1886
Osmia heliaca Warncke, 1988
Osmia helicicola Robinaeau, 1836
Osmia hellados van der Zanden, 1984
Osmia hemera Sandhouse, 1939
Osmia hendersoni Cockerell, 1907
Osmia hermona Warncke, 1992
Osmia hesperos Sandhouse, 1939
Osmia heteracantha Pérez, 1896
Osmia hurdi White, 1952
Osmia hyperborea Tkalcu, 1983
Osmia iberica van der Zanden, 1987
Osmia illinoensis Robertson, 1897
Osmia imitatrix (Tkalcu, 1992)
Osmia indeprensa Sandhouse, 1939
Osmia indigotea Morawitz, 1875
Osmia inermis (Zetterstedt, 1838)
Osmia inspergens Lovell & Cockerell, 1907
Osmia integra Cresson, 1878
Osmia interrupta Latreille, 1811
Osmia inurbana Cresson, 1878
Osmia iridis Cockerell & Titus, 1902
Osmia ishikawai Hirashima, 1973
Osmia jacoti Cockerell, 1929
Osmia jason Benoist, 1929
Osmia jilinensis Wu, 2004
Osmia juxta Cresson, 1864
Osmia karooensis Brauns, 1926
Osmia kashmirensis Nurse, 1903
Osmia kenoyeri Cockerell, 1915
Osmia kincaidii Cockerell, 1897
Osmia kirgisiana van der Zanden, 1994
Osmia kohli Ducke, 1899
Osmia labialis Pérez, 1879
Osmia lacus Sandhouse, 1939
Osmia laeta Sandhouse, 1924
Osmia lanei Sandhouse, 1939
Osmia laticauda Stanek, 1969
Osmia laticella van der Zanden, 1986
Osmia latisulcata Michener, 1936
Osmia latreillei (Spinola, 1806)
Osmia lazulina Benoist, 1928
Osmia leaiana (Kirby, 1802)
Osmia leucomelana (Kirby, 1802)
Osmia lhotelleriei Pérez, 1887
Osmia lignaria Say, 1837
Osmia liogastra Cockerell, 1933
Osmia livida Tkalcu, 1978
Osmia lobata Friese, 1899
Osmia longicornis Morawitz, 1875
Osmia longula Cresson, 1864
Osmia lunata Benoist, 1929
Osmia lupinicola Cockerell, 1937
Osmia madeirensis van der Zanden, 1991
Osmia malina Cockerell, 1909
Osmia maracandica Morawitz, 1894
Osmia marginata Michener, 1936
Osmia marginipennis Cresson, 1878
Osmia maritima Friese, 1885
Osmia maxillaris Morawitz, 1875
Osmia mediana Engel, 2006
Osmia mediorufa Cockerell, 1932
Osmia melanocephala Morawitz, 1875
Osmia melanogaster Spinola, 1808
Osmia melanopleura Cockerell, 1916
Osmia melanota Morawitz, 1888
Osmia melanura Morawitz, 1872
Osmia mertensiae Cockerell, 1907
Osmia michiganensis Mitchell, 1962
Osmia microdonta Cockerell, 1931
Osmia microgramma Dours, 1873
Osmia milenae Tkalcu, 1992
Osmia mirhiji Mavromoustakis, 1957
Osmia mixta Michener, 1936
Osmia mongolica Morawitz, 1880
Osmia montana Cresson, 1864
Osmia moreensis van der Zanden, 1984
Osmia morongana Cockerell, 1937
Osmia mustelina Gerstäcker, 1869
Osmia mutensis Peters, 1978
Osmia namaquaensis Friese, 1913
Osmia nana Morawitz, 1873
Osmia nanula Cockerell, 1897
Osmia nasoproducta Ferton, 1909
Osmia nasuta Friese, 1899
Osmia natalensis Cockerell, 1920
Osmia nemoris Sandhouse, 1924
Osmia neocyanopoda Rust & Bohart, 1986
Osmia nifoata Cockerell, 1909
Osmia nigricollis Warncke, 1992
Osmia nigrifrons Cresson, 1878
Osmia nigritula Friese, 1902
Osmia nigriventris (Zetterstedt, 1838)
Osmia nigrobarbata Cockerell, 1916
Osmia nigrohirta Friese, 1899
Osmia nigroscopula (Wu, 1982)
Osmia niveata (Fabricius, 1804)
Osmia niveibarbis Pérez, 1902
Osmia niveocincta Pérez, 1879
Osmia notata (Fabricius, 1804)
Osmia novaescotiae Cockerell, 1912
Osmia nuda Friese, 1899
Osmia obliqua White, 1952
Osmia ocularis Warncke, 1988
Osmia odontogaster Cockerell, 1897
Osmia ogilviae Cockerell, 1932
Osmia onocrotala Warncke, 1988
Osmia opima Romankova, 1985
Osmia oramara Warncke, 1992
Osmia orientalis Benoist, 1929
Osmia ornatula Cockerell, 1932
Osmia pachyceps Friese, 1922
Osmia pagosa Sandhouse, 1939
Osmia palmae Tkalcu, 2001
Osmia palmyrae van der Zanden, 1998
Osmia pamirensis Gussakovsky, 1930
Osmia papaveris (Latreille, 1799)
Osmia paradisica Sandhouse, 1924
Osmia parietina Curtis, 1828
Osmia pedicornis Cockerell, 1919
Osmia pennata Warncke, 1988
Osmia pentstemonis Cockerell, 1906
Osmia peregrina Warncke, 1988
Osmia phenax Cockerell, 1897
Osmia physariae Cockerell, 1907
Osmia pieli Cockerell, 1931
Osmia pikei Cockerell, 1907
Osmia pilicornis Smith, 1846
Osmia piliventris Friese, 1913
Osmia pingreeana Michener, 1937
Osmia polkruga Warncke, 1992
Osmia potentillae Michener, 1936
Osmia pratincola Warncke, 1988
Osmia proxima Cresson, 1864
Osmia prunorum Cockerell, 1897
Osmia pulsatillae Cockerell, 1907
Osmia pumila Cresson, 1864
Osmia punica Pérez, 1896
Osmia purpurata Ducke, 1899
Osmia pusilla Cresson, 1864
Osmia quadricornuta Wu, 2004
Osmia quadridentata (Dumeril, 1860)
Osmia ramona Warncke, 1992
Osmia raritatis Michener, 1957
Osmia ravouxi Pérez, 1902
Osmia rawlinsi Sandhouse, 1939
Osmia recta Pérez, 1902
Osmia reginae Cockerell, 1932
Osmia regulina Cockerell, 1911
Osmia relicta (Popov, 1954)
Osmia rhodoensis (van der Zanden, 1983)
Osmia rhodognatha Cockerell, 1932
Osmia ribifloris Cockerell, 1900
Osmia rostrata Sandhouse, 1924
Osmia rufa (Linnaeus, 1758)
Osmia rufigastra Lepeletier, 1841
Osmia rufina Cockerell, 1931
Osmia rufinoides Wu, 2004
Osmia rufohirta Latreille, 1811
Osmia rufotibialis Friese, 1920
Osmia rutila Erichson, 1835
Osmia sanctaerosae Cockerell, 1910
Osmia sandhouseae Mitchell, 1927
Osmia sanrafaelae Parker, 1985
Osmia satoi Yasumatsu & Hirashima, 1950
Osmia saxatilis Warncke, 1988
Osmia saxicola Ducke, 1899
Osmia sculleni Sandhouse, 1939
Osmia scutispina Gribodo, 1894
Osmia sedula Sandhouse, 1924
Osmia sequoiae Michener, 1936
Osmia sexsignata Benoist, 1950
Osmia shaanxiensis Wu, 2004
Osmia signata Erichson, 1835
Osmia simillima Smith, 1853
Osmia simplex Morawitz, 1875
Osmia sladeni Sandhouse, 1925
Osmia sogdiana Morawitz, 1875
Osmia solitaria Sandhouse, 1924
Osmia sparsipuncta Alfken, 1914
Osmia spinulosa (Kirby, 1802)
Osmia sponsa Nurse, 1904
Osmia stangei Genaro, 2001
Osmia steinmanni Müller, 2002
Osmia subaustralis Cockerell, 1900
Osmia subcornuta Morawitz, 1875
Osmia subfasciata Cresson, 1872
Osmia submicans Morawitz, 1870
Osmia subtersa Cockerell, 1930
Osmia svenssoni Tkalcu, 1983
Osmia sybarita Smith, 1853
Osmia tadjika Warncke, 1992
Osmia tanneri Sandhouse, 1939
Osmia tarsata Provancher, 1888
Osmia taurus Smith, 1873
Osmia tawildara Warncke, 1992
Osmia tergestensis Ducke, 1897
Osmia tersula Cockerell, 1912
Osmia teunisseni van der Zanden, 1981
Osmia texana Cresson, 1872
Osmia thoracica Radoszkowski, 1874
Osmia thysanisca Michener, 1957
Osmia tingitana Benoist, 1969
Osmia titusi Cockerell, 1905
Osmia tokopahensis Michener, 1936
Osmia torquata Warncke, 1988
Osmia trevoris Cockerell, 1897
Osmia tricornis Latreille, 1811
Osmia tricuspidata Dours, 1873
Osmia tridentata Dufour & Perris, 1840
Osmia trifoliama Sandhouse, 1939
Osmia tristella Cockerell, 1897
Osmia tuberculata (Nylander, 1848)
Osmia tunensis (Fabricius, 1787)
Osmia turneri Cockerell, 1937
Osmia unca Michener, 1937
Osmia uncicornis Pérez, 1895
Osmia uncinata Gerstäcker, 1869
Osmia universitatis Cockerell, 1907
Osmia vandykei Sandhouse, 1924
Osmia versicolor Latreille, 1811
Osmia villosa (Schenck, 1853)
Osmia virga Sandhouse, 1939
Osmia viridana Morawitz, 1874
Osmia watsoni Cockerell, 1911
Osmia xanthomelana (Kirby, 1802)
Osmia yanbianensis Wu, 2004
Osmia zarzisa Warncke, 1992
Osmia zephyros Sandhouse, 1939