LIST OF THE ORCHIDE^E OF THE MUDGEE DISTRICT. By Alex. G. Hamilton. My object in compiling this list is to contribute something towards a knowledge of the geographical distribution of plants in New South Wales. At some future time I hope to be able to give a list of the remaining phanerogamous plants, and of the ferns. Most of the species hereinmentioned have been collected by myself, and determined by Mr. R. D. Fitzgerald from fresh specimens. For the names of a few species which I have not myself collected, I am indebted to a list given me by Dr. Woolls, of plants which he collected when on a trip to Mudgee. I have to thank both these gentlemen for their assistance in this and many other matters of the kind. Some of the species, notably those belonging to the genus Caladenia, are not considered good by some authors, but Mr. Bentham points out, (in the Flora Australiensis) that the study of the plants in a fresh state may afford some characters which will separate those that in a dry state appear to be mere varieties, and such study leads me to think that the species in question are good ones. It is on the examination of fresh specimens that Mr. Fitzgerald bases the diagnoses of the species in his elaborate work on Australian Orchids. The greater number of the species mentioned have been collected within a radius of five miles from Guntawang. The country here is a fair specimen of the district generally, including rocky and barren hills, moist, shady and fertile gullies, open timbered country, and rich flats on the banks of the Cudgegong River. I have also collected around Cullenbone, Reedy Creek, Two-Mile Flat, and Mudgee, but have found no species differing from those at Guntawang, with the exception of Bendrobium,
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