_Calosoma schayeri_ is our type of this cosmopolitan genus. They live in cavities in cultivated fields, and are very useful insects where numerous, for they devour the larvae and pupae of many species of cut-worms. It measures about 1 inch in length, has a small head, narrow rounded thorax, and very broad, short, rounded abdomen; the whole is bright metallic green. It has a wide range over Australia, and may sometimes be even taken in the Sydney streets. The Genus _Pamborus_ contains many distinctive black beetles, some of which are marked with coppery green tints; they measure up to 1 inch in length, and are broad in proportion. When captured, many of them discharge an acrid fluid or gas that stains the fingers reddish brown. _Pamborus viridis_ is black, with the wing covers thickly ridged with parallel punctured striae marked with green. _P. alternans_ is a larger beetle, 1¼ inches long, with the same small head, and rounded thorax tapering and narrow behind; the coppery-tinted elytra have very broad parallel ridges. [Illustration: =Figs. 56–59.=--Typical Carabidae. 56. _Helluo costatus_ (Bonelli). The Desert-Carab. 58. _Hyperion schroetteri_ (Schreib.). The Forest-Carab. 57. _Trichosternus renardi_ (Chaud.). The Scrub-Carab. 59. _Catadromus australis_ (Casteln.). The Swamp-Carab. (Original photo. Burton.)] _Drypta australis_ is a small beetle about 5 lines in length; it has a pointed head, large projecting eyes, and the thorax forms a cylindrical neck hardly broader than the head; the wing covers do not quite cover the tip of the abdomen. In general colour it is yellowish brown, with the antennae, legs, a broad stripe down the centre and the edges of the wing covers dark purple to black; the wing covers are very finely striated and punctured. They live on the edges of swamps, and sometimes fly into the lamp at night. A beetle with a very wide range is _Helluo costatus_; it is a medium sized brown beetle; the head and thorax are about the same length, the latter rounded on either side in front but narrowed behind; the wing covers are flattened, broadly ridged, and not reaching to the tip of the abdomen. [Illustration: =Fig. 60.=--_Pheropsophus verticalis_ (Dejean). The Yellow Bombardier Beetle which discharges an acrid gas when disturbed. (“Agricultural Gazette,” N.S.W.)] Our Common “Bombardier Beetle,” _Pheropsophus verticalis_, is another widely distributed species; it measures over ½ an inch in length, and is of a general dark brown tint, with the head, antennae, and thorax dull yellow; the wing covers, which do not reach to the tip of the abdomen, are blotched on either side and the tip with the same colour. It can be found in any damp spot under stones or logs; and as soon as disturbed, it discharges a small cloud of vapour with a distinct report, and which feels quite warm to the fingers.