The masked ring-tailed possum is a marsupial of New Guinea’s forests. It has been recorded in mid-montane primary and secondary forest.
A 1915 comparison with related species describes the back of P. larvatus as smoky gray. This entry reports only that dorsal color from the comparison.
At Mount Stolle in Papua New Guinea, animals treated as P. forbesi larvatus were observed eating bark. Adult males were captured at feeding trees more often than females or juvenile males.
An extinction-risk assessment has not been added yet.