Unknown distribution. Recorded only from Fiji on two weeds: crowsfoot and barnyard grasses. The Oulema species unknown. Another species, Oulema melanopus, is recorded from Asia, Africa (north), North America, Europe, as a major pest of cereals.
Eggs laid on leaf mid-vein; larvae hump-backed, covering themselves in faecal matter. Pupate on soil. Adults with red heads and thorax and black wing cases; often seen 'mate-guarding'.
Larvae feed on the surface of leaves setting back plant growth so that the grasses are overgrown by other weed species. Damage greatest on crowsfoot grass.
No control measure required. Whether or not the beetles will move to other grasses, i.e., those of the grasslands of western Viti Levu, Fiji, is unknown.
Alternatively, the Fiji Oulema species may have potential as a biocontrol organism attacking particular weed grasses.