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Show 94 MR. R. TRIMEN ON BUTTERFLIES [Jan. 20, appearances under process of modification in mimicry of the genus Acrcea. While the fulvous colouring and dark borders unquestionably give this butterfly a strong resemblance to A. buxtoni, Butler, as far as the upper surface goes, the spotting and colouring of the under surface present (especially in the hind wings) an unmistakable likeness to those of A. axina and A. atergatis, Westwood, the mimicry being further strengthened by all the details of colouring in the head, body, and legs. I regard this as a most instructive case of mimicry in progress, because, on both surfaces of the wings, the ordinary coloration and markings of the section of Zeritis to which Z. molomo, mihi, and Z. aranda, Wallengr., belong would appear to have afforded the obvious material on which natural selection has worked to bring about the very decided, though still incomplete, likeness to Acrcea, the lengthening of the fore wings materially assisting in producing the effect required. Genus ALPENA, Boisd. 78. A L ^ N A A M A Z O U L A , Boisd. Acrcea (Alcena) amazoula, Boisd. App. Voy. de Deleg. dans l'Afr. Aust. p. 591. n. 60(1847). Okavango River (December). One female example. This is the most northern and w7estern station known to m e for this species. Other tropical localities for it are Bulawayo in Mata-bele- land, and Umfula River in Mashuna-land, whence examples have been sent to m e by Mr. F. C. Selous. Family PAPILIONID^E. Subfamily PIERIN^E. Genus T E R I A S , Swains. 79. T E R I A S BRIGITTA (Cram.). 2 • Papillio brigitta, Cram. Pap. Exot. iv. t. cccxxxi. ff. B C (1780). Omrora (August), Ehanda (August-September), Humbe (October), and Okavango River (December). Twenty-two examples; ten males and twelve females. One of the three males from Ehanda has the underside without any tinge of rufous, and resembling that of the ordinary male zoe, Hopff., in tint, but the markings are almost obsolete. 80. TERIAS ZOE, Hopff. $. Terias zoe, Hopff., Monatsb. Akad. Wissensch. Berl. 1855, p. 640; and Peters, Reise Mossamb., Ins. p. 369, t. xxiii ff. 10 11 (1862). Omrora (August and November), Ehanda (September), Humbe (October), and Omaramba-Oamatako (January). Seven male examples. |