28TH FEBRUARY.--The wheelwright and Mortimer came into the camp at 6 A.M., bringing back the horse of the former, and one of the lost bullocks. We set out early, and after travelling about six miles I came upon a cart-track, which I followed to the westward until overtaken by a stockman, who informed me that the Wammerawa, on which I had been encamped, joined the Barwan, then on my right, within two miles of the spot on which we stood; that he belonged to the cattle station of Mr. Parnell, Jun., which was distant from my last camp about five miles, and on the main river; also that the track I was following led to Mohanna, Mr. Lawson's station, seventy-five miles lower down the Barwan. I turned with him towards the junction of the Macquarie and Barwan, and encamped thereby, right glad to reach at length, the river beyond which our exploratory tour was to commence. The river looked well, with a good current of muddy water in it, of considerable width, and really like a river. I understood from my guide to this point, that there was a good ford across the river at his station; also that Commissioner Mitchell had been down the river a short time back, making a map to show all the cattle stations on both banks. We had neither seen nor heard anything of Mr. Wright, the commissioner of the Macquarie district through which we had just passed, except that he "might visit the district when the hot weather was over." Here we found a new species of CALOTIS.[*] Thermometer at sunrise, 61 deg.; at noon, 101 deg.; at 4 P.M., 100 deg.; at 9, with wet bulb, 62 deg.. [* Calotis SCAPIGERA (Hook. MSS.); stolonifera glaberrima, foliis omnibus radicalibus lineari-spathulatis, scapo nudo monocephalo, achenii aristis robustis subulatis retrorsum pilosis apice rectis vel uncinatis.--A very distinct species. Habit of BRACHYSTEPHIUM SCAPIGERUM D. C.: but that ought to have no aristae to the achenium: here the awns are very stout in proportion to the size of the capitulum.]