O
Oniticellus (see also [Oniticellus flavipes]), [xvii], [176]–181, [186], [281], [286].
Oniticellus flavipes (see [Yellow-footed Oniticellus]).
Onitis (see also [Bison Onitis]), [38], [48], [286].
Onthophagus (see also the varieties below), [xiii], [xv], [xvii], [30]–31, [34], [48], [150], [164], [168], [172]–188, [190], [223], [227], [231], [263]–292.
Onthophagus cænobita (see [Monk Onthophagus]).
Onthophagus fronticornis, [188].
Onthophagus furcatus (see [Forked Onthophagus]).
Onthophagus lemur (see [Spectral Onthophagus]).
Onthophagus nuchicornis, [173], [183], [265].
Onthophagus Schreberi (see [Schreber’s Onthophagus]).
Onthophagus taurus (see [Bull Onthophagus]).
Onthophagus vacca (see [Cow Onthophagus]).
Orus Apollo (see [Horapollo]).