Dr. Baikie's postscript, however, mentions that his vessel had been wrecked about 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. R. Catalogue of the Dipterous Insects collected in the Aru Islands by Mr. A. R. WALLACE, with Descriptions of New Species. By FRANCIS WALKER. ARU ISLAND. Fam. MYCETOPHILIDAE, _Haliday_. Gen. SCIARA, _Meigen_. Div. A. _a., Meig_. vi. 305. 1. SCIARA SELECTA, n. s. _Mas_. Nigra, cinereo-tomentosa, antennis sat validis, pedibus piceis, alis 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 1-3/4 line; of the wings 4 lines. Fam. BIBIONIDAE, _Haliday_. Gen. PLECIA, _Hoffmansegg_. 2. Plecia dorsalis, _Walk_. See Vol. I. p. 5. Fam. CULICIDAE, _Haliday_. 3. CULEX SCUTELLARIS, n. s. _Mas_. Nigro-fuscus, capite thoraceque argenteo trivittatis, scutello rufescente; abdominis segmentis argenteo fasciatis, genubus et tarsorum posticorum fasciis niveis; alis subcinereis, 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. Fam. TIPULIDAE. Gen. MEGISTOCERA, _Wied_. 4. Megistocera tuscana, _Wied. Auss. Zweist._ 1. 55. 1. Inhabits also Java. Gen. GYNOPLISTIA, _Westw_. 5. GYNOPLISTIA JURGIOSA, n. s. _Mas. et Foem._ Nigra, capite rufescente, alis cinereis, plagis costalibus nigro-fuscis.--_Mas_. Abdomine ochraceo, apice nigro, femoribus basi testaceis.--_Foem._ Abdomine atro fasciis albidis apice luteo. _Male and Female._ Black. Head reddish; antennae testaceous at the base; thorax testaceous in front; wings greyish, blackish-brown along the costa, and with three subcostal blackish-brown patches, the third continued along the veins towards the hind border. _Male_. Abdomen ochraceous, black at the tip; femora testaceous at the base; halteres testaceous. _Female._ Abdomen deep black, with whitish bands on the sutures; tip luteous. Length of the body 5-6 lines; of the wings 9-10 lines. Fam. STRATIOMIDAE, _Haliday_. Gen. PTILOCERA, _Wied_. 6. Ptilocera quadridentata. See Vol. 1. p. _7_.