Oil-beetle.
Ornate Cerceris.
Oryctes nasicornis.
Oryctes Silenus.
Osmia (see also the varieties below).
Osmia cyanea (see Blue Osmia).
Osmia cyanoxantha.
Osmia Latreillii (see Latreille's Osmia).
Osmia parvula (see Tiny Osmia).
Osmia tricornis (see Three-horned Osmia).