Family 24, Scenopinidæ.—The Scenopinidæ include a few minute, black flies, not exceeding a quarter of an inch in length. They are not very common, but are sometimes found about windows.
Family 25, Scroceridæ.—This family also contains small species of flies, but their metamorphoses are at present unknown.
Fig. 141.—Medeterus Nolatus (Mag.)
They are usually to be found resting easily on dry branches of trees, but are generally rare.
Family 26, Empididæ.—The insects of this group are very similar to the Asilidæ in their carnivorous propensities, but the species are usually of a much smaller size. Empis livida is a common yellowish species measuring about one-third of an inch in length.
Fig. 142.—Dolichopus Regalis (Mag.)
Family 27, Dolichopodidæ.—This family is a very extensive one, including a considerable number of genera and species. They are usually small flies often of brilliant metallic colouring. They may be found generally in the neighbourhood of water.
