509 Von Alpenburg, _Mythen und Sagen Tirols_, p. 260 _sq._ A Westphalian form of the expulsion of evil is the driving out the _Süntevögel_, _Sunnenvögel_, or _Sommervögel_, _i.e._, the butterfly. On St. Peter’s Day, 22d February, children go from house to house knocking on them with hammers and singing doggerel rhymes in which they bid the _Sommervögel_ to depart. Presents are given to them at every house. Or the people of the house themselves go through all the rooms, knocking on all the doors, to drive away the _Sunnenvögel_. If this ceremony is omitted, it is thought that various misfortunes will be the consequence. The house will swarm with rats, mice, and other vermin, the cattle will be sick, the butterflies will multiply at the milk-bowls, etc. Woeste, _Volksüberlieferungen in der Grafschaft Mark_, p. 24; J. W. Wolf, Beiträge zur deutschen Mythologie, i. 87; A. Kuhn, _Westfälische Sagen, Gebräuche und Märchen_, ii. §§ 366-374; Montanus, _Die deutschen Volksfeste, Volksbräuche_, etc., p. 21 _sq._; Jahn, _Die deutschen Opfergebräuche bei Ackerbau und Viehzucht_, pp. 94-96. 510 Usener, “Italische Mythen,” in _Rheinisches Museum_, N. F. xxx. 198. 511 S. Powers, _Tribes of California_, p. 159. 512 G. Catlin, _North American Indians_, i. 166 _sqq._; _id._, _O-kee-pa, a Religious Ceremony, and other Customs of the Mandans_. 513 Moura, _Le Royaume du Cambodge_, i. 172. Cp. above, p. 178.