_Opistoplatys australasiae_, representing the small sub-family TRIBELOCEPHALIDAE, was described and figured by Westwood in 1859; it is not uncommon on tree trunks about the Richmond River, N.S.W. It measures over ½ an inch in length, and is flattened on the dorsal surface; the abdomen is elongate, and rounded at the apex; its general colour is dull chocolate brown, with the centre of the back slightly pubescent. In the group HOLOPTILINAE are some species with feather-like hind legs, the tibiae being densely clothed with long dark hairs. They are usually found on the trunks of dead trees, under the shelter of the drying detached bark, where they are found in all stages of development; they probably feed upon the small insects that come there for shelter. Horvath has identified those I have sent him as _Ptilocnemus femoralis_, a new species, though there are four other species described from Australia. This new species measures over ⅓ of an inch, and has the head, thorax, and joints of the legs dull yellow; the under surface and apical areas of the elytra are marbled with black and brown; the antennae, head, thorax and legs are fringed with long black hairs, which on the hind tibiae are so thick as to give the appearance of a feather or brush. _Aradellus cygnalis_, figured and described by Westwood (Thesaurus Ent. 1874), is also found hiding under dead bark on tree trunks. Some specimens were taken at Gunnedah, N.S.W., but I also have a closely allied, if not a new species, from Bathurst, N.S.W. It measures slightly over ⅙ of an inch in length, is of a general blackish brown colour, with yellowish legs, and the elytra are black, mottled with blotches of white; the curious thickened antennae and legs are fringed with short stout, bristle-like hairs. The ACANTHASPINAE are larger slender-legged bugs, well represented in Australia. The genus _Sphedanocores_ contains several distinct species with a wide range. _S. distinctus_ measures over ¼ of an inch in length, and is mottled and barred with dark orange and black; the head is turned downwards and the rostrum is stout; the thorax is very rugose. _Reduvius personatus_ is a cosmopolitan species that takes up its quarters in the house, covering itself with bits of dirt and feeding upon the common bed bug. It is recorded both from Australia and Tasmania. The larval form of an allied bug has the broad back concave, and covers itself with particles of sand; it rests under the shelter of logs and stones where it lurks during the day. _Reduvius rivulosus_ is a large bug measuring ¾ of an inch in length; it is of a general dull brown colour with the elytra mottled with dull yellow, while the whole insect is clothed with fine woolly hairs, denser upon the legs. It comes from the Shoalhaven district, N.S.W.