The typical Genus _Asilis_ contains some handsome flies generally met with in open forest country: _Asilis inglorius_, over 1 inch in length, has large black eyes; the front of the head is clothed with grey bristles; the thorax is olive green, marbled with grey pubescence, thickest on the ventral surface; the legs are red, the tarsi black; and the wings are clouded with yellow; the abdomen is much elongated to the pointed tip, reddish brown, the first 3 segments thickly clothed with long, pale, golden, downy hairs, and with the terminal segments covered with very short reddish brown hairs. _A. plicatus_ is slightly larger, of a general greyish brown tint, with pale reddish brown markings on the thorax; the legs are darker brown; the abdomen is lightly clothed with fine scattered grey hairs. _A. fulvitarsus_ is a much smaller species of a somewhat uniform buff tint, inclined to a golden tint on the lower portion of the abdomen; the face is clothed with grey and buff hairs, and the wings are light brown. _Blepharotes splendidissma_ is a very handsome fly with the abdomen flattened, broad, and almost heart shaped; it measures nearly 1½ inches in length, and 2½ across the outspread wings. It is of a general black colour with the abdomen of a shining bronzy green tint; the face is clothed with yellow bristles; the thorax has grey pubescence on the sides, and the outer margins and tip of abdomen are fringed with tufts of yellow and black downy hairs. I have frequently captured it flying about in the Botanic Gardens, Sydney, in the early summer. _Phellus glaucus_ is a very curious fly found in the interior of Western Australia; it measures nearly 2 inches from the front of the head to the tip of the wings; a great tuft of bright yellow hairs stand out in front of the head; it is thickly clothed on the under-surface of the head with pale yellow hairs; the legs are very stout and hairy, and clothed with black down marked with white and large yellow tufts on the hind legs. The abdomen is thickened, elongated and broadly rounded to the tip, of a uniform deep metallic blue tint, but so thickly clothed with short black down that its rich colour is somewhat obscured. _Craspedia coriaria_ is one of our largest robber-flies, widely distributed all over the interior of the continent; its mouth is produced into a stout pointed awl-like process, with which it can pierce the integument of the stoutest insect, and it can be often seen flying along with its beak buried in the back of a large cockchafer beetle (_Anoplognathus_), and with its large legs clasping its victim as it sucks up its blood. Its general colour is black, with the broad, flattened, more elongate abdomen thickly clothed with short brick-red hairs; the legs and under surface are very hairy, with tufts of stiff black hairs fringing the outer edges of the abdominal segments. The wings are opaque and almost black, with an expanse of about 3 inches.