1. _Bolboceras proboscidium_ (Schreibers). 3. _Onthophagus australis_ (Guérin). 5. _Trox dohrni_ (Harold). Family TENEBRIONIDAE. 6. _Zopherosis georgii_ (White). (Original photo. Burton.)] [Illustration: _Plate XVII.--COLEOPTERA._] Family 26. HETEROCERIDAE. This group contains a number of small beetles that are semi-aquatic in their habits; these are also clothed with fine hairs, and have short clubbed antennae with the two basal joints enlarged. They are found burrowing in mud or wet sand close to water. Only seven species are recorded from this country, most of them belonging to the Genus _Heterocerus_; Westwood described two (Proc. Ent. Soc. London 1874): Macleay another from Gayndah 1871: and Blackburn four others (Trans. Roy. Soc. S.A. 1887–91). Family 27. Stag Beetles. LUCANIDAE. This is the first group of the Lamellicorn beetles, which are defined by the structure of their short antennae composed of 9–10 joints ending in a three-jointed lamellated club. In the Stag Beetles the antennae are ten-jointed, and in the typical forms have the mandibles, especially in the males, produced in front of the eyes like horns. Australia is rich in these beetles, both in number and beauty of form and colouration. The chief writers upon them are Macleay (Proc. Linn. Soc. N.S.W. 1885); and Westwood (Trans. Ent. Soc. London 1885–63–71). _Rhyssonotus nebulosus_ is a dark brown beetle mottled with black upon the dorsal surface; the small narrow head is furnished with projecting horns with several distinct points; the thorax is broad, curiously divided into rounded areas interspersed with depressed punctured patches; the body is rather short; the wing covers very indistinctly ribbed and mottled with black. It measures slightly over 1 inch in length, and has a wide range over N.S. Wales and Southern Queensland. I have bred this beetle from the fleshy white grub of the usual Lamellicorn Beetle type taken under rotten logs. In the Genus _Lamprima_ we have 12 described species of our beautiful “Gold Beetles,” which in the larval state live in rotten wood, from which the beetles emerge and crawl up the twigs of the young gum saplings; in favourable localities they can often be taken in great numbers while mating. They are all rich metallic green, gold, blue, or coppery in tint; the horns, projecting and turning up in front, are clothed with fine hairs along the inner margin; the thorax is very convex, rounded on the sides; the fore-legs very robust; the body not twice the length of the thorax, and rounded at the apex. Many species are so variable that it is probable that when carefully studied the number of species will be much reduced.