The Queens' smorguesbord from their mystery magazine in the annual selection of 24 pieces. Phyllis Bentley's West Riding and Stuart Cloete's old Africa provide less expected backgrounds and contributors; Anthony and Michael Gilbert, Julian Symons and Simenon among the more than predictable; Stanley Ellin's story of a bottle of wine worth 100,000 francs to a cuckold is not his best but then there's Christianna Brand's ""King of the Air""--about a dying woman and a bird of prey--and Celia Fremlin's ""The Betrayal"" in which a woman unintentionally provides a coup de grace to a former, now dying, lover. And others--with the editor's introductions like frilly springs of parsley. . . . Reliable.