_Saropogon princeps_, described by Macquart, has a large reddish brown wasp-like form that at first sight might be easily mistaken for a Pompilid wasp. It measures 1½ inches in length, with a wing expanse of about 3 inches. The head, under-surface, centre of the thorax above, the basal segment, and two bands on the abdomen are black; the rest is dull red, with the hind margin of the wings hyaline. I have a specimen from Mittagong N.S. Wales. _Brachyrhopala ruficornis_ comes from Mackay, Queensland, and has a very wasp-like appearance both in the colouration and shape of the body. It is under ½ an inch in length with the typical robber-fly head and spiny legs, but the abdomen is contracted into a cylindrical waist behind the thorax, rounded in the centre, and tapered to the tip. The head and thorax are almost black; the hind margin of the latter and legs are dull red; the abdomen is dull yellow with the basal segments marked with blackish brown, forming two almost confluent bands round the broad centre. Family 12. False Robber-flies. APIOCERIDAE. These flies are of medium size not unlike _Muscidae_, with large elongated bodies, short antennae, and clear wings. This is a small family containing two genera, the species of which are peculiar to North America, Chili, and Australia. _Apiocera bigotii_, described by Macquart, is about ¾ of an inch in length; it has a short head not so wide as the thorax, with a long projecting proboscis; the elongate broadly rounded thorax is truncated behind; the abdomen is broadest in front, rounded, and tapers to the tip, which terminates in a tuft of fine spines. The wings are somewhat iridescent with reddish veins; the general colour of the fly is a dull brown, with white hairs and silvery pubescence clothing the hind portion of the head and under-surface of the thorax, and also mottling the dorsal surface of the body with grey. Some specimens in my possession come from the Shoalhaven district. _Apiocera asilica_ described by Westwood is a larger much darker insect, with black hairs on the upper surface and grey on the under surface; it ranges from Queensland to the Blue Mountains N.S.W. Family 13. Big-eyed Flies. PIPUNCULIDAE. These are tiny little creatures with very large heads consisting almost entirely of two great hemispherical eyes. The short antenna terminates in a bristle. About 80 species had been described, chiefly from Europe, until Perkins published the descriptions of 26 species from Australia (Leaf Hoppers and their natural enemies Pt. iv. Pipunculidae) Hawaii 1905.