It has a notably more elongated snout than most of its relatives, a feature that gives it its scientific name and distinguishes it at first glance from other wood mice in the mountains of Chiapas. It inhabits the cloud forest and pine-oak forest of this range in south-eastern Mexico, an area that harbours a remarkable diversity of endemic small mammals thanks to its complex mountainous topography. Like other mice of its genus, it is an opportunistic nocturnal forager that takes seeds, fruit and invertebrates depending on seasonal availability in the understorey. Described so thoroughly that it is one of the best-documented endemic rodent species in Chiapas within its genus, its range nevertheless remains restricted to the mid- and high-altitude zones of these mountains.
Small rodent with greyish-brown fur on the upperparts and white on the underparts, featuring a notably more elongated snout than related species, a trait that gives it its name. It differs from other Peromyscus species in the Chiapas mountains precisely by this longer, narrower snout.
Small track 1.3-1.8 cm, with 4 fore toes and 5 hind toes. Small, elongated droppings 3-5 mm, left scattered along paths through the mountain understorey vegetation. It digs shallow burrows beneath roots, fallen logs or rocks, with the entrance semi-hidden among dense vegetation in the cloud forest and pine-oak woodland it inhabits.
Mountain cloud forest and pine-oak forest with a dense understorey, generally between 1500 and 3000 m altitude. Endemic to the mountains of Chiapas in south-eastern Mexico.
Omnivorous, feeding on seeds, fruit, fungi and invertebrates from the mountain understorey where it lives.
Solitary and nocturnal, with a home range centred in the dense understorey of its mountain forest habitat.
Populations are considered to be in decline due to the ongoing loss of the cloud forest and pine-oak woodland on which it depends, across a range fragmented by the various mountain ridges of Chiapas.
Deforestation and fragmentation of mountain forest caused by agricultural and livestock expansion in the mountains of Chiapas.
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