WALLACE ON DIPTERA OF AEU ISLANDS. 77 700 species of plants, and numerous fine fruits, which he says " will rejoice Sir William Hooker's heart." Dr. Baikie's postscript, however, mentions that his vessel had been wrecked ahout twelve miles above Lagos, and that she sunk in a few minutes after she struck. He does not say what was the fate of his collections, but states that all the party had fever from fatigue and sleeping in swamps after the wreck. — J. E. Catalogue of the Dipterous Insects collected in the Aru Islands by Mr. A. E. Wallace, with Descriptions of New Species. By Feancis Walkeb. Artj Island. Fam. MYCETOPHILID^, Raliday. Q-en. SciAEA, Meigen. Div. A. a., Meig. vi. 305. 1. SciARA SELECTA, D. s. Mus. Nigra, cinereo-tomentosa, antennis sat validis, pedibus piceis, ahs cinereis, venis costalibus crassis. Male. Black, with cinereous tomentum; antennae rather stout; legs piceous ; wings greyish ; veins black ; radial and cubital veins thick ; radial vein extending to the fork of the subapical. Length of the body If line; of the wings 4 lines. Fam. BIBIONID^, Haliday. G^en. Pleolal, Hoffmansegg. 2. Plecia dorsalis. Walk. See Vol. L p. 5. Fam. CULICIDiE, Haliday. 3. CuLEX scuTELLARis, n. s. Mas. Nigro-fuseus, capite thoraeeque argenteo trivittatis, scutello rufescente ; abdominis segmentis argenteo faseiatis, genubus et tarsorum posticorum fasciis niveis ; alis subcine-reis, venis nigris ciliatis. Male. Blackish brown. Head and thorax with three silvery stripes, the middle one very distinct ; scutellum reddish ; pectus with silvery gloss ; abdomen with silvery bands, which are narrow above, broad beneath ; femora pale towards the base ; knees snow-white ; hind tarsi with 5 broad snow-white bands ; middle tarsi with the first and second joints white at the base ; wings slightly greyish ; veins black, fringed. Length of the body 3 lines ; of the wings 5 lines.