Vegetation of the Bealey River Basin. Supplement to List of Species (1929), With Notes. Robert M. Laing, M.A., B.S.c., F.N.Z.Inst., and H. W. Gourlay, M.Sc. [Received by Editor, 27th October, 1932; issued separately, May, 1934.] We are well aware that the work of Drs. Cockayne and Allan has shaken to its foundations the splendid taxonomic work of Cheeseman; and that no list of species of any New Zealand district can be considered altogether satisfactory which does not take into account the presence of hybrids and epharmonic varieties. Nevertheless, it is necessary in the first place to follow to some extent Cheeseman's system if the ground is to be prepared for a fuller and more modern investigation of the area under consideration; and we have therefore in this paper in many cases identified species on the basis of Cheeseman's Flora, though we know that we are dealing with aggregate species, or with forms whose exact type is unknown. Obviously it would be impossible for us in many cases to do otherwise; for a more exact research would demand a complete study of the species dealt with in all its forms throughout New Zealand. Such a study is impracticable in a paper intended merely to form a basis of further research in a given district. We hope, however, if time and opportunity offer, to extend our work to a fuller consideration of the forms dealt with, to bring our knowledge of them as far as possible into harmony with modern taxonomic and ecological methods. We have already begun such a study in connection with the smaller-leaved species of Pittosporum, and it is proving exceptionally interesting. At present we intend only to add to the list already published (1929, Trans., N.Z. Inst., 59, p. 715) such species as have been identified in the district subsequently to its publication. We propose in some cases to give descriptions of forms rather than actual names that may be misleading. The attempt to force into the Procrustean bed of the Manual, a form which obviously is too wide or too narrow for such a process, can only create further difficulties for subsequent observers, since it is quite clear that some races of plants in the Pass are distinct from those found elsewhere, or at least differ in certain respects from those included by Cheeseman in his description. When, however, a name is given without comment, we consider that the plant referred to may readily be included within the four corners of Cheeseman's prescription. Further, we have not restricted this list to the Upper Bealey River basin, but have included some species found in the watershed, only to the south of Halpins Creek. We have, however, so far not made any complete investigation of the lower area, nor of many of the valleys near the snow line. Mr Gourlay has paid much attention to the grasses, and the result is a largely extended list of these.