The typical Genus _Rutilia_ is well represented in Australia by a number of large, showy flies rich in metallic tints, and as a general rule not so thickly or coarsely clothed with bristles. _Rutilia formosa_, originally described from New Holland by Desvoidy, is not uncommon along the eastern coast in the summer months. It measures from ¾ to 1 inch in length; is of a general rich light metallic blue tint; the abdomen indistinctly barred with black is rich metallic coppery red, duller in the larger females, which have the abdominal segments more hirsute and bristly. The larvae are parasitic upon beetle grubs, probably those of the brown cockchafer (_Anoplognathus_). _R. decora_ is about the same size and has much the same habits and range. The thorax is rich metallic blue, darker in front, with a row of short black bars; the abdomen is black with a double row of bright green metallic spots down the centre, the two at the anal tip largest. _R. vivipara_ measures about 1 inch in length, with a wing expanse of 1½ inches; it is of a general dull greyish brown tint; the abdomen is lighter brown, and has a dark line down the centre and the sides and tips lightly clothed with grey hairs. _R. inornata_, about the same size as the last species, is a much darker fly; the abdomen is of a uniform dull shining black with grey hairs on the sides but none on the tip. Both these species have an extended range in forest country. _Myocera longipes_ has the general colouration of a house fly, with long, clear wings behind which are large white squamae; and it has very long slender legs. It has a curious habit of resting on the tree trunks with its long legs spread out in a very characteristic manner. [Illustration: Plate XXIX.--DIPTERA. Family MUSCIDAE. 1. _Lucilia tasmaniensis_ (Macquart). Large blue-bottle fly. 2. _Lucilia caesar_ (Linn.). Introduced sheep fly. 3. _Lucilia sericata_ (Meigen). Metallic blue-bottle fly. 4. _Musca domestica_ (Linn.). Common house fly. 5. _Musca corvina_ (Fabr.). Bush fly.] [Illustration: _Plate XXIX.--DIPTERA._] Family 20. Flesh Flies. SARCOPHAGIDAE. These flies differ from the true house flies in having the bristle of the antennae plumose at the base but fine and hair-like at the extremity. They lay their eggs or living larvae upon meat or other exposed food, and are also known as “Scavenger” flies because they frequent evil-smelling places like pig-sties and slaughter-yards. Some species are known to deposit their larvae in the nostrils of animals, and there are several records of the death of human beings from infestation by these maggots.