214.

Mount Pirr 1 Deermouse

Isthmomys pirrensis

French: Péromyscus du Pirre / German: Braune Isthmusratte / Spanish: Ratén ciervo de Pirri

Other common names: Mount Pirri Isthmus Rat

Taxonomy. Peromyscus pirrensis Goldman, 1912, headwaters of Rio Limon, 4500 ft (= 1372 m), Mt. Piri, Darién Province, Panama,

Isthmomys pirrensis was initially described as a species of Peromyscus following recognition of Isthmomys as subgenus under Peromyscus . Recent evidence suggests that Isthmomys is sister to Reithrodontomys instead of Peromyscus, validating its status as a valid genus. Monotypic.

Distribution. E Panama and extreme NW Colombia.

Descriptive notes. Head-body 157-172 mm, tail 185-204 mm, hindfoot 36-37 mm. No specific data are available for ear measurements or body weights. The Mount Pirri Deermouse is a Neotoma-sized, Peromyscus-like rodent. Dorsum is brownish cinnamon to cinnamon rufous, lined with black hairs; venter is white, with plumbeous-colored hairs. Forefeet are white, and hindfeet are white, with dusky hair to toes. The Mount Pirri Deermouse differs from the Yellow Deermouse ( I. flavidus) in being darker in color and having a larger hindfoot and longer more narrow skull.

Habitat. Old growth evergreen forests at elevations of 1067-1584 m in the Serrania del Darién mountain range.

Food and Feeding. No information.

Breeding. No information.

Activity patterns. The Mount Pirri Deermouse is presumably nocturnal.

Movements, Home range and Social organization. No information.

Status and Conservation. Classified as Least Concern on The IUCN Red List.

Bibliography. Carleton (1980, 1989), Goldman (1912b), Hall (1981), Osgood (1909), Platt et al. (2015).