To this genus belongs one of the best-known species of the group, the six-banded armadillo or encoubert (_D. sexcinctus_) of Brazil and Paraguay; a very similar species, _D. villosus_, the hairy armadillo, replacing it south of the Rio Plata. There are also two small species, _D. vellerosus_ and _D. minutus_, from the Argentine Republic and North Patagonia; the latter, which differs from the other three in having no tooth implanted in the premaxillary bone and is often referred to a genus apart, as _Zäedius_. In _Tatoua_ (_Cabassous_ or _Lysiurus_) the teeth are 9/9 or 8/8, of moderate size and subcylindrical: the most posterior placed a little way behind the anterior root of the zygoma, but far from the hinder margin of the palate. Skull somewhat elongated, much constricted behind the orbits, and immediately in front of the constriction considerably dilated. Lower jaw slender, with the coronoid process small and sharp pointed, sometimes obsolete. Vertebrae: C 7, D 12-13, L 5, S 10, Ca 18. Head broad behind. Ears rather large and rounded, wide apart. Movable bands of armour 12-13. Tail considerably shorter than the body, and slender, covered with nearly naked skin, with a few small, scattered, bony plates, chiefly on the under surface and near the apex. On the fore-feet the first and second toes are long and slender, with small claws and the normal number of phalanges. The other toes have but two phalanges; the third has an immense sickle-like claw; the fourth and fifth similar but smaller claws. The hind-feet are comparatively small, with five toes, and small, triangular, blunt nails; the third longest, the first shortest. The best-known species of this genus, the tatouay or cabassou, _T. unicinctus_, is, after _Priodon gigas_, the largest of the group. It is found, though not abundantly, in Surinam, Brazil and Paraguay. Others, such as _T. hispidus_ and _T. lugubris_, have been described.