Its song, which is by no means disagreeable, is poured forth while the bird is perched upon some conspicuous part of a bush, or some little spray among the branches of the large fallen trees, where it loves to dwell, as on the approach of an intruder it can readily and effectually secrete itself among the high grass and herbage which have grown up amidst the branches. The facility with which it creeps among or threads these little thickets is surprising. It rarely flies, but depends for progression more upon the rapidity with which it can pass over the ground, than upon the feeble powers of its small rounded wing. This species may be regarded as a bird whose natural habitat is the interior rather than the country near the coast; for although it does occur in some districts of New South Wales on the sea side of the dividing range, it is much more abundant on the northern or interior side in all situations favourable to its existence. I found it on the low bills to the north of the Liverpool Plains, as well as in most parts of South Australia; I believe it is a stationary bird, as it appeared to be equally numerous in summer and winter. Of its nidification I have nothing to communicate, its nest not having been discovered either by myself or by any of my party. Its food consists of insects of various kinds, and like many insectivorous birds, I believe it seldom if ever drinks, not even during the greatest droughts. The sexes present no visible difference in their plumage. Crown of the head, all the upper surface, wings and tail brown; lower part of the rump and upper tail-coverts chestnut-red; all but the two centre tail-feathers crossed near the tip with a broad band of black, beyond which the tips are greyish white; line over the eye and all the under surface greyish white, each feather of the latter with a line of black down the centre, except on the middle of the abdomen bill dark brown; irides buffy white; legs flesh-brown. The figures are of the natural size. [Illustration: HYLACOLA CAUTA: _Gould_. _J. Gould and H. C. Richter del et lith._ _C. Hullmandel Imp._ ] HYLACOLA CAUTA, _Gould_. Cautious Wren. _Hylacola cauta_, Gould in Proc. of Zool. Soc., Part X. p. 135. The only locality in which I have seen this species is the great scrub clothing the banks of the river Murray in South Australia, where it was not uncommon, but so excessively shy that I obtained a single specimen only during my stay in the district. Its timidity being so great, and its natural habitat the more dense parts of the scrub, it is a species which must for a long time be exceedingly scarce in our collections. The individual killed was fired at within a few yards of where I stood, it being impossible to sight it at a greater distance.