_Lamprima latreillei_ is our commonest species; it measures 1¼ inches in length; the head is rich coppery red, the rest metallic green; the thorax deeply and coarsely punctured. It is however a very variable species both in size and colouration; in a large series we can find them all shades to metallic blue; with stout horns or long horns; and ranging from the dimensions given to ½ an inch smaller. _L. rutilans_ is the southern form found in Victoria: _M. insularis_ is only found in Lord Howe Island. _Phalacrognathus muelleri_, one of the largest and most beautiful of all our beetles, was named by Macleay after Baron von Mueller, from specimens obtained from Cairns, North Queensland; it could be best described as a giant gold beetle, 2 inches long; of a brilliant green and coppery red tint. The male has the horns greatly produced in front of the head. _Lissapterus howittanus_ measures nearly 1½ inches, and is broad in proportion; the abdomen is shorter than the head and thorax combined; the horns curve round in front and are thickened and serrate at the base; the rugose head forms a ridge in front, fitting closely into the punctured thorax. The female is about 1 inch in length; has the head more flattened, and furnished with short, stout, toothed mandibles. This curious beetle is peculiar to Victoria. The Genus _Ceratognathus_ contains 7 species of our smallest Stag Beetles, none of which measure ½ an inch; they are black or brown; the mandibles of the male are produced into short curved horns with a square flange on the outer basal margins. I obtained the larvae of the species named after me by Blackburn in considerable numbers in the outer bark of _Eucalyptus robusta_. The larva is a white, shining, semitransparent grub with a slender abdomen; the pale brownish head is round and slightly elongate, with stout three-toothed mandibles; with long slender legs; and with the dorsal surface of the body clothed with fine ferruginous spines interspersed with hairs. _Figulus regularis_ is a small, shining, elongate black beetle measuring slightly over ½ an inch; it has short angular mandibles, finely punctured thorax, and striated elytra. It has a wide range over Australia, and is very common under decaying logs. The PASSALIDES are a group of what might be called flattened hornless Stag Beetles (some of very large size), that are found under rotting logs. _Aulacocyclus kaupi_, measuring 1¼ inches, is shining black; has short curved mandibles in front; the head is excavated in the centre, with a short, bent, finger-like horn curving forward above the hollow; the thorax is broad; and the elytra ribbed. The larva is dull white, long, slender, and somewhat cylindrical; it has a small head, and very long legs furnished with sickle-shaped claws. When full grown, they pupate in elongate, oval, smooth, brown cocoons of earth and woody matter. Kaup in 1871 published a Monograph of the _Passalidae_, in which many of our species are described.