The family ORTALIDAE is represented here by a very handsome species, _Ortalis coerulea_; it is about the size of a house fly, with deep metallic blue thorax and banded black abdomen; the transparent wing is clouded with black at the base and the tip, and has a black V-shaped band in the centre. It is very common in summer usually resting on the foliage of the grass-trees, and can be easily captured with a net. _Lamprogaster laeta_ is another fine species, with a wide range from Victoria to Queensland. It measures nearly ½ an inch from the front of the head to the tip of the body; the large semitransparent wings are blotched along the front with black. The dorsal surface and curious angular abdomen are deep metallic blue; the legs and under-surface reddish brown. I have usually found it on the highlands, and it is common on the Blue Mountains N.S.W. in the summer months. The AGROMYZIDAE are small yellow flies, sometimes marked with green; they puncture the tissue of plants and cause excrescences and galls upon the foliage and flower buds. One tiny species, _Agromyza sp._, attacks the midrib of the leaves of the “Blood-wood” (_Eucalyptus corymbosa_), common about Sydney; producing soft yellow spongy excrescences aborting all the young foliage. _A. phaseoli_ is a great pest to the growers of french beans in the Gosford district N.S.W.; the fly inserts her eggs in the stem of the young plant just above the surface of the ground. It is a tiny black fly, with bluish tints on the body. It was described by Coquillett (Pro. Linn. Soc. N.S.W. 1899) from specimens I sent to him for identification. [Illustration: =Fig. 149.=--_Agromyza phaseoli_ (Coquillett). The French-bean fly, the larva of which feeds on the stems. (“Agricultural Gazette,” N.S.W.)] [Illustration: =Fig. 150.=--_Phytomyza affinis_ (Fallen). An introduced Leaf-mining fly, and a common garden pest. (“Agricultural Gazette,” N.S.W.)] The PHYTOMYZIDAE are small dark coloured flies, whose larvae are leaf miners; and several species are well known pests to the gardener. _Phytomyza affinis_ breeds in the winter in the leaves of the sow thistle; the next generation swarm on the marguerites, sunflowers and many others of the _Compositae_, thereby causing them to wither and fall.