( 84 II. Pseudacraea euiytus hobleyi, its forms and its models on the islands of L. Victoria, and the bearing of the facts on the explanation of tnimicry by Natural Selection. By G. D. Hale Carpenter, M.B.E., D.M., F.L.S.;F.E.S., F.Z.S., Uganda Medical Service. [lluad November 5tli, 1919.] Plates II, III. Forms of Pseudacraea eurytus hobleyi and its models were the subject of a paper which was communicated to the Society in November 1913, and was pubUshed in these Transactions, March 31, 1914, pp. 60G-645. The object of the paper was to show that with com-parative scarcity of models on the islands, mimics which do not maintain the typically close resemblance are not destroyed by the action of natural selection (working, presumably, through vertebrate enemies), but are pre-served ; while in other places such as Entebbe on the mainland where models are more numerous than mimics the latter are kept true to type. The explanation of the great number of varieties on the islands as compared with the mainland was first suggested to me by Prof. Poulton, as a result of a collection made on Damba island in 1911, which was described in Proc. Ent. Soc. 1911, pp. xci-xcv; 1912, pp. xxii-xxiii. Some of them were figured on PI. xxxvi in the above-mentioned paper in 1914. When I returned to the islands at the beginning of 1914 I went to a different group (see map), lying south of Entebbe and about twenty-five miles from it. Camp was pitched on the west end of the north shore of Kome, and the neighbouring small islands Bulago, Tavu, Ngamba, and Kimmi were frequently visited. In August 1914 work was cut short by the call of active service, and during the rest of that year and in 1915 I was with troops on the Kagera river to the west of the lake. I spent many months at Kakindu (about 31° 30' E., 1° 10' S.), where was a fine forest known as the Tero forest, and here were obtained more specimens of the forms of Pseudacraea eurytus and their models. TRANS. ENT. SOC. LOND. 1920. — PARTS I, II. (jULY)
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