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Show 1903.] OF THE PERCY SLADEN EXPEDITION. 243 size of examples from Pard, while those from South Brazil and Matto Grosso agree with Paraguayan specimens in having this dimension about 105 mm. D. sexcinctus will therefore stand for the N. Brazilian form, and D. gilvipes, based on Azara's Tatou poyou, for the large southern one. 34. TATU NOVEMCINCTUS L. <?. 1032,1040, 1079, 1102, 1133, 1148. 2 . 1039, 1202. 35. TATU MEGALOLEPIS Cope. 2. 1H5. As a topotype of Cope's species, hitherto unrepresented in the Museum coUection, this Armadillo forms a valuable accession. The species is perhaps not so widely separated from T. septem-cinctus as its describer supposed, for this specimen has 45-47 scales in the movable bands, and the Museum contains examples of septemcinctus from Rio Grande do Sul with only 54, so that the gap between the two, stated by Cope to be from 43 to 57, is thereby considerably reduced. In size T. megalolepis is decidedly smaller than the older known species, the skull of Mr. Robert's example being only 63 m m . in length. 36. DIDELPHIS PARAGUAYENSIS Oken. J. 998. 2. 1207. Practically topotypes of Wagner's D. pcecilotis, which was collected at Cuyaba. 37. MARMOSA CONSTANTLE, sp. n. tf. 1110. 27 August, 1902. Type. (B.M. No. 3.7.7.157.) Size rather larger than in M. cinerea. Fur close and fine, shorter and less woolly than in M. cinerea; hairs of back about 9 mm. in length. General colour above paler than usual in this group, nearly matching Ridgway's " isabella," or slightly greyer. On the sides the colour gradually becomes more buffy, passing gradually into the " buff-yellow " of the under surface, the chin, chest, centre of belly, inner side of limbs, and inguinal region being all of this latter colour. On the sides of the belly the hairs are slaty at base, but on the rest of the under surface they are yellow to their roots. Face pale buffy grey; black orbital rings present, but narrow, ill-defined, and not prolonged forwards on to the sides of the nose. Cheeks to base of ear dull buffy yellow. Ears large, naked, greyish brown. Outer side of fore and hind limbs dull buffy isabella, like the sides. Tail rather shorter than usual in this group, its basal furry portion about 1 \ inches in length, brownish isabella above, yellowish below; naked portion about half brown and half white, the junction of the two colours mottled and irregular. 16* |