To the point of view that the differentiation of the sexes at Zuñi proceeds on the whole from the division of labor, the native custom of allowing a boy or man to become, as far as ways of living go, a girl or woman, gives color. Towards adolescence, and sometimes in later life, it is permissible for a boy culturally to change sex. He puts on women’s dress, speaks like a woman, and behaves like a woman. This alteration is due to the fact that one takes readily to women’s work, one prefers it to men’s work. Of one or another of the three men-women now at Zuñi or of the men-women in other pueblos I have always been told that the person in question made the change because he wanted to work like a woman or because his household was short of women and needed a woman worker.