Reviewing the Hopi calendar it is found that _katcina_ worship appears in ceremonies from December to July, inclusive, and while none of the festivals between July and December is a true _katcina_, the majority of those during the remainder of the year bear this name. As expressed by the Hopi priests, the _Nimán_ ceremony celebrates the departure of the _katcinas_ from the pueblos, to which they do not return for about six months. This _Nimán_ (“Departure”) ceremony of the _katcinas_ is celebrated in July, and no _katcinas_ are personated in the Hopi pueblos until December. The time of the return of these supernaturals is not as distinct as that of their departure, and they may be said to straggle back in the December and January rites; but their return in force takes place in the February ceremony called _Powamû_ which is made up wholly of characteristic _katcina_ exhibitions. It is of some interest to determine the month of the return, for there are _katcina_ personations in December (_Soyáluña_) and during the January moon, and it may be held that their appearance in the former proves that the advent of these worthies occurs in the month named. The chief participants in the December rite (and the same may be said of the January ceremony) are not distinctive _katcinas_, or rather there are other ceremonies not belonging to this cult in their composition, and no special distinctive _katcina_ altars are erected. In the _Powamû_, however, there is a true _katcina_ altar which is essentially the same as that set up in the _Nimán_ when the _katcinas_ leave the pueblo. _Powamû_ may thus be regarded as the official celebration of the return, and from that time to July these personages dominate the ritual. But the rites of intervening moons are not all necessarily pure _katcinas_, even if _katcinas_ participate in them. Thus, in the March ceremony, _Palülükoñti_ (_Unkwanti_), they are again subordinate. This is not a pure _katcina_, but that of another cult into which they have straggled or to which they have been added in the course of evolution. There are only two great _katcina_ celebrations, _Powamû_ and _Nimán_, both controlled by the _katcina_ chief, both with a true _katcina_ altar, both free from other Hopi cults.