No. XII.— NEUROPTERA, MYRMELEONID^ FROM THE INDIAN OCEAN. By James G. Needham. (Communicated by Prof. J. Stanley Gardiner, M.A., F.R.S., F.L.S.) (Text-Figures 1—3.) Eead 5th June, 1913. Four species of antlions, collected in the Seychelles and other islands of the south-western part of the Indian Ocean by the Percy Sladen Trust Expedition, were sent to me by Mr Hugh Scott for study, and are here reported upon. One of the species is the well-known Myrmeleon obscurus Rambur which is widely spread in that part of the world. Rambur and Walker reported it from Mauritius, and in the present collection it is represented by specimens from nearly all the islands that were visited. A new species of Formicaleo, belonging to the subgenus Distoleon, is represented by a single specimen from Mahe, Seychelles Islands. Tlie other two species, singularly enough, were collected only from the coral atoll of Aldabra. One of these, a fine Acanthaclisis, is new to science. The list, with localities and other data, together with descriptions of the new species follows. 1. Myrmeleon obscurus, Rambur (Fig. l). Myrmeleon obscurus Rambur, Hist. Nat. Ins. Neur., 1842, p. 403; Walker, Cat. Neur., Part II, 1853, p. 370. Fig. 1. Myrmeleon obscurus Rambur, wings. This species is represented by fifteen specimens from a number of difierent islands. Length to wing tips 27 mm., expanse of wings 50 mm. The specimens agree well with Walker's description, which is ample for recognition.