The SAPROMYZIDAE contain a great number of small flies which are generally met with resting among the foliage when sweeping or beating the scrub in the early morning. They seldom have the wings spotted, and the abdomen is broader than that of the former group. The larvae feed under the bark of trees, or among decaying vegetation. _Sapromyza fuscicornis_ is of a uniform pale brownish yellow, with dark eyes, and with scattered stout bristles on the thorax; it is a large species over ¼ of an inch in length to the tip of the closed wings. It has a wide range over Australia. _S. decora_ is a very much smaller dark brown fly, with a fine white stripe on each side of the thorax extending across the sides of the head above the eyes. It is common in summer in the orchards among the orange trees. In the members of the Genus _Celyphus_ the scutellum is so abnormally inflated that it covers all the posterior parts of the body, so that these tiny shining black creatures are quite unlike the typical Diptera. A dark brown fly about the size of a house fly that has been described under the name of _Batrachomyia nigritarsis_ by Skuse, is a parasite in the larval state on the back of several of our common frogs, where feeding under the skin it forms a regular blister; when full grown the larva makes its way through the skin, and pupates in the damp soil. The SCATOPHAGIDAE are slender, elongate, medium sized flies that can be bred out of dung or decaying vegetable matter, and are found in most parts of the world. _Scatophaga guerini_ measures over ⅓ of an inch in length; it is of a dull greyish brown tint, marked on the head and thorax with parallel whitish bars, thickly clothed on the stout legs with fine hairs; and the long wings are folded over the back when at rest. It has a wide range; I have it from Sydney, and have bred it from the cylindrical white maggots in “toad-stools” collected on the banks of the Darling River, N.S. Wales.