A mouse with records from the New Guinea highlands. Four specimens reported under the former subspecies name were caught in secondary savanna and a sweet-potato field.
In a comparison of four specimens, the former frigicola form was reported as longer-furred and brighter, with darker feet, than muscalis specimens. The sample was small, so this is not asserted for the whole population.
Field records under the former subspecies name include captures in secondary savanna at Wamena and in savanna and a sweet-potato field at Jiwika.
An extinction-risk assessment has not been added yet.