Figs. 129-132. Proechimys setosus elegans, sex ?, UZM no. L 104, Lagoa Santa. × 1.
Skull.—Short; rostrum short and stout; length of nasals approximately 15 mm (broken); bullae roundish, smooth and well-inflated; jugals dorso-ventrally narrow (3.1 mm) with strong transverse ridge; postorbital process of zygoma spiniform, slender and involving mostly jugal; incisive foramen narrow (3.8 x 1.7 mm) and narrowest in posterior part; vomerine sheath complete; posterior palatine foramina obsolete; mesopterygoid fossa extending forward as far as middle of second molars.
Teeth.—Incisors orthodont. P4 with two counterfolds; M1 with two counterfolds but anterior one notably small; M2 and M3 with only one counterfold each. In lower jaw: p4 with two counterfolds, one anterior to main fold; molars with only one counterfold.
Comparisons.—From P. s. elegans, setosus differs in: M1 with two counterfolds as opposed to only one; M3 with one counterfold instead of sometimes with two counterfolds; p4 with one counterfold anterior to main fold and another posterior, instead of both counterfolds posterior.
Remarks.—The measurements above were taken from the Maximilian specimen mentioned above. Measurements of the type were given by [Desmarest] as: head and body, 5-1/2 inches, tail about 6-1/2 inches. Is. [Geoffroy] Saint-Hilaire (1838:886) corrects these measurements to: head and body 195 mm; tail (part missing), 170 mm.
Proechimys setosus elegans ([Lund])
E[chimys]. elegans [Lund], 1841, Kong. Danske Videnskab. Selsk. natur-vidensk. math. Afhandl., Kjöbenhavn, 8:99 (orig. descr.).
Loncheres elegans [Lund], 1841, Kong. Danske Videnskab. Selsk, natur-vidensk. math. Afhandl., Kjöbenhavn, 8:245, 266, 294; [Wagner], 1843, Wiegman's Archiv f. Naturg., Berlin, 2 (Jahrg. 9):47.
Echimys cayennensis Waterhouse, 1848, Nat. Hist., Mammalia, 2:337.