At seventeen miles we entered a plain where grew trees of the Acacia pendula, and we traversed it in the most elongated direction or to the south-west. On entering the wood beyond a sudden, extreme pain in my thigh made me shout before I was aware of the cause. A large insect had fastened upon me, and on looking back I perceived Souter, The Doctor, defending himself from several insects of the same kind.* He told me that I had passed near a tree from which their nest was suspended; and it appeared that this had been sufficient to provoke the attack of these saucy insects, who were provided with the largest stings I had ever seen. The pain I felt was extreme, and the effect so permanent that when I alighted in the evening from my horse on that leg, not thinking of the circumstance, I fell to the ground, the muscles having been generally affected. The wound was marked by a blue circular spot as large as a sixpence for several months. (*Footnote. Genus, Vespa; subgenus, Abispa; species, Abispa australiana (mihi). Head, antennae, and feet yellow; eyes black; the scutellum of prothorax yellow; the scutum of mesothorax black, with the scutellum yellow; the scutum of metathorax yellow, with the scutellum black, and the axillae yellow. The wings yellow, with dusky tips. The first segment of abdomen has the petiole black. The second segment is black, and the rest yellow.) Beyond the wood a magnificent sheet of water lay before us and extended like a noble river in a north and south direction. Keeping its eastern bank I traced it southwards until I reached the termination, or rather an interval, where some rocks occurred in its bed, of the same kind as those last mentioned. The produce of gradual decomposition lay around the rocks and seemed to prove that although these masses had been originally denuded by the current which formed the channel, the current had not flowed there for a very considerable time. We encamped between the two lagoons, separated by this interval and these rocks, in latitude 29 degrees 27 minutes 27 seconds South. February 4.