Pelage.—Aristiforms on middorsal region: Gray basally, gradually blackening toward tip; total length, 24 to 26 mm; maximum width, 1.3 mm. Aristiforms on outer thighs: Gray basally, gradually blackening toward middle, and distal parts near (15"c) Pinkish Cinnamon; total length, 18 to 20 mm; maximum width 0.8 mm. Setiforms on middorsal region: Gray basally, gradually blackening toward tip but interrupted by Cinnamon-Buff, subapical zone; total length 14 to 16 mm; maximum width, 0.06 mm.
Skull.—Slender; bullae large and well-inflated; jugals with conspicuous, transverse ridge; postorbital process of zygoma moderately developed and involving only squamosal; incisive foramen short and narrow (4.1 × 2.1 mm); vomerine sheath complete, with maxillary part short and thick; mesopterygoid fossa extending forward as far as posterior parts of second molars; posterior palatine foramina at plane of premolars.
Fig. 128. Map showing the geographic ranges of the subspecies of Proechimys iheringi.
Teeth.—Upper and lower molariform teeth with two counterfolds. Counterfolds coalesced in P4 and M1 of one specimen.
Comparisons.—From P. i. gratiosus and P. i. panema, paratus differs in: all molariform teeth with two, instead of some with fewer, counterfolds; vomerine sheath complete and thick instead of usually incomplete; incisive foramen shorter and narrower; aristiforms conspicuously wider; setiforms Cinnamon-Buff instead of Ochraceous-Buff and Cinnamon, respectively. Tail 96 per cent of head and body in paratus instead of 100 per cent as in panema.
Remarks.—The animals were captured in climax forest.
Specimens examined.—Total number, 3 (MN), from Brazil, Espirito Santo, Santa Teresa, Floresta da Capela de São Braz; altitude 630 meters.