1. _Opistoplatys australasiae_ (Westw.). 3. _Pirates ephippiger_ (White). 6. _Pristhesancus papuensis_ (Stal). 12. _Gminatus nigroscutellatus_ (Bredden). 15. _Gardena australis_ (Horvath). Family PENTATOMIDAE. 2. _Cuspicona forticornis_ (Bredden). 4. _Poecilometis strigatus_ (Westw.). 7. _Megymenum insulare_ (Westw.). 8. _Philia basalis_ (Grey). 9. _Poecilometis histricus_ (Stal). 13. _Cermatulus nasalis_ (Westw.). 14. _Geobia australis_ (Erich.). 16. _Notius depressus_ (Dall.). Family COREIDAE. 5. _Amorbus robustus_ (Mayr). Family GALGULIDAE. 10. _Mononyx annulipes_ (Horvath). Family PENTATOMIDAE. 11. _Oechalia schellembergi_ (Guérin).] [Illustration: _Plate XXXII.--HEMIPTERA._] Family 6. Fungus Bugs. ARADIDAE. These are dull coloured black or brown bugs of moderate size, with the dorsal surface very rugose, and the whole insect thin and flattened, admirably adapted to the life it leads hidden under the dead bark on tree trunks, their chief food being fungous growths found upon the damp bark. Howard calls them “Flat Bark Bugs,” and remarks that they look as if they had been stepped upon. They have the tip of the abdomen exposed, as the elytra are shorter than the body, which is also exposed on the sides when the wings are folded. Like the Lace-bugs (_Tingidae_) they have no ocelli, but, unlike them, they have the scutellum exposed. This family contains about 300 described species, divided into four sub-divisions. Erichson has described several from Tasmania (Arch. 1842); Bergroth (Verh. Z. b. Ges. Wien 1886) and Walker (Cat. Heter. 1874) others from Australia. There are a number of undetermined species in our Museum collections, most of which are to be found upon fallen timber where the bark is rotting and peeling off the trunk. Family 7. Water Striders. HYDROMETRIDAE. These are aquatic insects, living upon the surface of the water, and some are even found on the open ocean, hundreds of miles away from land. They, like most other water-dwellers, are covered with a velvet-like pubescence; the head is ornamented with large projecting eyes; the antennae are four-jointed. They may be wingless; when present, the elytra are of a uniform texture. Most of the species are furnished with very long legs. The tarsi are two-jointed. About 160 species are described under four sub-families; only three or four are described from Australia; but more from the open waters of the Pacific Ocean.