“The northern limit of this species on the Atlantic side of the continent, is (as I was told by the inhabitants) near the southern one of the _D. hybridus_, namely, 37° 30′. It is extremely abundant on the arid plains near the Sierra Ventana, and likewise in the neighbourhood of the Rio Negro. This species has a range considerably further southward than any other: I obtained specimens at Port Desire, where, however, it is far from common, and at Santa Cruz (in latitude 50°) I saw its tesselated covering lying on the ground. At Bahia Blanca, I found in the stomach of this armadillo, coleoptera, larvæ, roots of plants, and even a small snake of the genus Amphisbæna. All the species, excepting one, wander about by day. At Bahia Blanca, during a morning’s ride, three or four of the _D. minutus_ generally were met with; but, in order to secure them, it was necessary to jump off one’s horse as quickly as possible, otherwise, they would have disappeared by burrowing in the sandy soil. This species often endeavours to escape detection by squatting close to the ground, and remaining motionless.”—D. 1. DIDELPHIS AZARÆ. Didelphis Azaræ, _Auct._ “This species is said to inhabit burrows: it is nocturnal, and is very destructive to poultry. The body after death possesses a very offensive odour. My specimen was procured at Maldonado.”—D. 2. DIDELPHIS CRASSICAUDATA. PLATE XXX. Didelphis crassicaudata, _Desmarest_, Nouv. Dict. d’Hist. Nat. 2d Ed. ix. p. 425. —— —— Mammalogie, p. 257, Species 393. Microuré troisième, ou Macrouré à grosse queue, _Azara_, Essais sur l’Histoire Nat. des Quad. de la Province de Paraguay, vol. i. p. 284. _D. capite brevi; auribus parvis; colore corporis fuscescenti-flavo subtùs pallidiore; infra oculos flavescente; caudâ crassâ, caput corpusque, quoad longitudinem, ferè æquante; ad basin corporis colore tinctâ, dein nigra, ad apicem albâ._