Key to the subgenera of Malthodes:

(1) Aedeagus small and globular; elytra very short or short enough to leave at least the last abdominal segments uncovered 2
  Aedeagus large and elongate; elytra long enough to cover and slightly surpass the last abdominal segment; posteriormost urites little modified Libertimalthodes subg. nov.
(2) Elytra short; metathoracic wings tend to be present Malthodes Kiesenwetter, 1852
  Elytra very short; wings absent; head elongate; pronotum longitudinal Podistrina Fairmaire, 1875