318 DlDELPHTIDiE. 



This beautiful little species is readily distinguished from D. mit- 

 rina by its smaller size and shorter ears, from J), pusilla by its 

 possession of supraorbital ledges and of anterior basal ear-projections, 

 and from both by its smaller number of mammae and its more 

 brilliant coloration. 



j Ad. sk. I Q qi /K iDo Santa Cruz, Huallaga Mr. E. Bartlett [0.1. 



"•) Skull. ( ¥)*5i/o/oo- E., Peruvian Amazons. ( Ty^je of species.) 



, llmm. sk. I Bolivia. Mr. T. Bridges [0.]. 

 *• jSkuU. \ 



c, d. Yg. al., (5 ? . " Lidth de Jeude Coll. 



10. Didelphys pusilla. 



MicourS nain, Azara, Quadr. Parag. i. p. 304 (1801). 



Didelphys pusilla, Desm. N. Diet. d'H. iV. (1) xxiv. Tabl. p. 19 

 (1804) ; id. op. cit. (2) ix. p. 430 (1817) ; id. Mamm. i. p. 261 

 (1820) ; Desmoul. Diet. Class. d'S. N. v. p. 493 (1824) ; Gray, 

 Oriff. Cuv. An. K. v. p. 191 (1827) ; Less. Man. Mamm. p. 213 

 (1827) ; Desm. Diet. Sci. Nat. xlvii. p. 399 (1827) ; J. B. Fisch. 

 Syn. Mamm. p. 269 (1829); Less. H. N. Mamm. {Compl. Buff.) 

 V. p. 366 (1836); Waterh. Jard. Nat. Libr., Mamm. xi. p. 112 

 (1841) ; Wagn. Sehr. Sdug. Sui)p. iii. p. 50 (1843), v. p. 245 (1855) ; 

 Schinz, Syn. Mamm. i. p. 510 (1844) ; Waterh. N. H. Mamm. i. 

 p. 514 (1846); Burm. Thiere Bras. i. p. 140 (1854); Tomes, 

 P. Z. S. 1858, p. 648 ; Gieb. Sdug. p. 715 (1859) ; Lyd. Cat. Pass. 

 Mamm. B. M. v. p. 282 (1887). 



Didelphys nana, lU. Abh. Ak. Berl. 1811, p. 107 (1815) ; Schim, 

 Cuv. Thierr. i. p. 252 (1821). 



Peramys pusilla. Less. N. TaU. R. A., Mamm. p. 187 (1842). 



Didelphys elegans, Lund, Blik. Bras. Dyrev., Dansk. Afliandl, ix. 

 p. 135 (1842) {nee Waterh). 



Didelphys (Grymseomya) agilis, Burm. Thiere Bras. i. p. 139 (1854). 



Micoureus pusillus, Oerv. Casteln. Am. Sud, Mamm. p. 103, pi. xx. 

 fig. 2 (teeth) (1855). 



GrymjBomys agilia, Burm. Erldut. Faun. Bras. p. 82, pi. xv. flg. 1 

 (animal), pi. xi. fig. 6 (skull) (1856) ; Hem. Abh. Ak. Berl. 1872, 

 p. 124. 



Didelphys agilis, Oieb. Sdug. p. 714 (1859). 



Pigmy Opossttm. 



Size very small, much as in D. lepida. Fur soft, thick, and straight. 

 Ehinarium with two distinet notches on each side of the median line 

 below. General colour bright rufous, rather paler and less rich than 

 in B. lepida. Centre of face pale rufous ; black mark round eyes very 

 prominent, continued forwards to the sides of the muzzle nearly to 

 the nose. Ears (PL XXVIII. fig. 2) large, laid forward (in spirit- 

 specimens) they reach to or beyond the anterior canthus of the eye ; 

 their internal basal projection short, rounded, often almost obsolete, 

 their metatragus large and broad. Back very uniform rufous, 

 becoming gradually paler on the sides, and white, or whitish rufous 

 on the belly, the bases of the hairs mostly slate, except just on the 

 chin ; the whole of the underside, however, sometimes pure white. 

 Pouch absent. Mammce (PI. XXVIII. fig. 3) 6-1-6 or 7-1-7= 13 



