425.

Bolivian Rice Rat

Hylaeamys acritus

French: Oryzomys de Bolivie / German: Bolivien-Reisratte / Spanish: Rata arrocera de Bolivia

Other common names: Bolivian Hylaeamys

Taxonomy. Oryzomys acritus Emmons & Patton, 2005, El Refugio Huanchaca, Noel Kempff Mercado National Park, Santa Cruz, Bolivia.

This species is monotypic.

Distribution. Restricted to E bank tributaries of Rio Iténez in Beni and Santa Cruz departments, NE Bolivia.

Descriptive notes. Head-body 131-152 mm, tail 110-130 mm, ear 20-23 mm, hindfoot 27-31 mm; weight 57 g (holotype). The Bolivian Rice Rat is mediumsized, characterized externally by tail shorter than head-body length (average 81%), long dorsal (9-10 mm) and ventral hairs (3—4 mm), whitish venter, and large and fleshy hypothenar pad. Dorsum is brown to yellow-brown, with gray-based hair. Sides are paler than dorsum, yellowish to distinctly orange, brightest on cheeks and below ear. Rostrum is dusky above to behind eyes, with dusky-tipped cream or whitish hair. Anteroventral bases of ears have inconspicuous preauricular tuft of entirely whitish or pale gray hair, sometimes tipped with pale rufous. Pinnae are brown, thinly covered on interior surfaces with whitish or rarely brown hairs. Skin surrounding eyes is blackish. Ventral hairs are quite long, pale gray at bases with long white tips, and white of inner legs extends to join pure white of forefeet and hindfeet. Tail is dusky, paler below at base, but not prominently bicolored, and covered with inconspicuous short, fine, dusky hairs. Hindfeet are long and narrow.

Habitat. Evergreen riverine or gallery forest to deciduous and semideciduous terra firma and seasonally flooded forest bordering seasonally flooded pampa, including those of the top of the Huanchaca tableland, at elevations of ¢.700 m.

Food and Feeding. No information.

Breeding. The holotype of Bolivian Rice Rat was a subadult male with scrotal testes captured in November.

Activity patterns. The Bolivian Rice Rat is terrestrial and captured on the ground.

Movements, Home range and Social organization. No information.

Status and Conservation. Classified as Data Deficient on The IUCN Red List.

Bibliography. Emmons & Patton (2005, 2008), Percequillo (2015e).