Necrophorus, [191].

Newt, [1].

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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].