The Genus _Scopodes_ contains a number of tiny beetles that are common on the plains and about crabholes and swamps. _Scopodes sigillatus_ has the wing covers roughened, and measures about 2 lines in length; with its large projecting eyes it might be mistaken for a small Tiger Beetle. We now come to a group, PSEUDOMORPHIDES, comprising a number of genera that live under the loose bark on tree trunks; they have adapted themselves to their confined hiding places, so that they have become flattened and rounded, and even remarkable in colouration; and so, unless a collector carefully examines them, he would never at first sight think of including them among the Carabidae. The Genus _Silphomorpha_, in which over 40 species have been described, are yellow and black, or yellow and brown beetles up to ½ an inch in length; all their parts fit close together into a convex or oval form very like some of the water-beetles. _Silphomorpha colymbetoides_ and _S. nitiduloides_ are found about Sydney. The first has the head and thorax reddish brown, the elytra pale yellow broadly blotched in the centre with black: the second, much larger (¼ of an inch in length) is blackish, and the centre only of each wing cover blotched with dull yellow. The members of the Genus _Adelotopus_ are mostly black, narrow, and shield-shaped, with the tips of the wing covers truncated; while in _Philophloeus_, though very thin and flattened, they have the head and thorax well divided from the broad abdomen; and are dull yellow, striped, and barred with darker brown. Turning from these we come to the giant of all our carabs, _Hyperion schroetteri_, which lives in cavities in tree trunks, where it is often found by splitters in the red gum forests in Victoria and N.S. Wales. I have taken it at night round the camp fire on the Murray frontage. It is shining black, and measures 2½ inches in length, but being narrow in proportion it appears much longer than it really is; while with its large elongate head and immense jaws it is a very formidable-looking creature. The next in order is a large and interesting group, the SCARITIDES, which are not only wingless, but have the wing covers soldered together into one solid armour plate; their legs are adapted for digging, and many of them live in underground tunnels of considerable length. In most species the head, armed with large powerful jaws, fits close into the thorax, so that they move together; and in some groups the insect appears to be formed only of two parts, for the head and thorax taken together are as long and broad as the abdomen. After a heavy fall of rain in the interior, some species may be found in numbers under logs and stones, driven out of their holes and deep burrows. They are much sought after by collectors; and Macleay, Blackburn, and Sloane have described a number of curious species.