Epiphytal. _Pseudobulbs_ large, oblong-ovate, compressed, about three inches high and two inches broad, diphyllous. _Leaves_ lorate-lanceolate, keeled, very much narrowed to the base, of a dark green. _Scapes_ radical, bearing drooping racemes of from twelve to fifteen blossoms. _Flowers_ large and pleasingly coloured; _sepals_ spreading in a narrow triangle, lanceolate, slightly grooved in the centre, clear bright chestnut, with a narrow even edge of yellow; _petals_ smaller, lanceolate, spreading, an inch and a half long, of the same colour as the sepals but with more distinct yellow tips, and about two forked bars of a pale yellow colour at the base, opposite the lateral lobes of the lip, the margin slightly wavy; _lip_ white, three-lobed, the lateral lobes erect, crescent-shaped, spotted with chestnut, the broad rounded front lobe deeply fringed, cuspidato-acuminate, the base cuneate, channelled, the disk with a bifid crest, and three obcuneate conical brown spots. _Column_ erect, half-an-inch long, galeate, spotted with red, and having two short horn-like lateral auricles. Odontoglossum nevadense, _Reichenbach fil._, _MS._ in _Horto Lindeniano ac Mendeliano_; _Id._ _Xenia Orchidacea_, ii., t. 191, figs. 1, 2; _Id._ _Gardeners’ Chronicle_, N.S. xv., 136; _André_, _L’Illustration Horticole_, 3 ser., t. 45. The _Odontoglossum nevadense_ is a very distinct and also a very rare and beautiful species which was first discovered in 1868, by Mr. G. Wallis, when travelling for Mr. Linden in the Sierra Nevada of New Grenada. It is not often met with, as there are very few plants of it in cultivation, so far as we know, but we may hope that our energetic collectors will be fortunate enough to meet with and send home a further supply of so lovely a plant. We are indebted to Dr. Boddaert, of Gand, Belgium, for the materials which have been used in preparing our illustration, the plant from which our plate was copied having been grown in his fine collection of Orchids; this was the best specimen of the kind which we have seen, and was, when in bloom, an object of attraction of which Dr. Boddaert might well be proud. In this _Odontoglossum nevadense_ we have a compact-growing evergreen species, with small pseudobulbs, and light green foliage; it grows about ten inches in height, and produces its spikes of elegant flowers during the spring and summer months. The sepals and petals are reddish-brown, margined and tipped with yellow; the lip is white, its side lobes spotted with brown inside. It lasts about six weeks in beauty.