50 MAMMALS another genus (Propithecus) and are all curiously local and limited, each distinct species being characteristic of a distinct area. The avahis or woolly lemurs, unlike the indris and sifakas, are found either THE BROWN MOUSE-LEMUR solitary or in pairs. The true lemurs have more teeth than the others; the gentle lemur belongs to a different genus (Hapalemur) distinguishable by the more rounded head and shorter muzzle; the weasel-