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Show 1894.] MANICA, SOUTH-EAST AFRICA. 29 obsolescence. This last-mentioned male has some other black markings of the upperside considerably enlarged, and the middle spot of the oblique median row of three in the fore wings is out of line, being nearer to base than usual. Variation in the female lies chiefly in ground-colour, which in most examples is much obscured with brownish-fuscous clouding from the bases to beyond middle, but which exhibits much gradation, especiaUy as regards the red of the hind wings, which in one specimen is almost as bright as in the male. The hind-marginal border on the upperside is more or less diffused internally, and its enclosed spots quite obsolescent in aU the females. The two specimens (male and female) from the Eevue Eiver are a good deal larger (exp. 2 in. 8 lin.), with more elongated fore wings ; their colouring is brighter and clearer, and all the black markings, except the few spots on the fore wings, are reduced, especially the spots and hind-marginal border of the hind wings, which latter has no diffusion internally and all the ground-colour spots it encloses quite distinct. On the underside of the hind wings the dull lake-red colouring is much reduced, forming internervular rays ; and on the back of the thorax and abdomen the paired creamy and whitish spots are much larger and more conspicuous. Mr. Selous was disposed to think that these larger brighter individuals just mentioned belonged to a species distinct from A. acrita, especially as they were found flying in forest tracts among lofty trees, whereas the numerous examples of typical acrita frequented open grassy hill-sides. But after very careful examination it seems to m e more probable that they represent a seasonal (winter) form, having been captured in June, whereas all the ordinary specimens of A. acrita were captured between February 12th and March 18th. The male taken by Mr. Selous in Mashunaland in 1883 (exact date not recorded), mentioned by me loc. cit., belongs to this form, but is a little smaller. 23. ACRCEA ACARA, Hewits. Acrcea acara, Hewits. Exot. Butt. iii. pi. 8. figs. 19, 20 (1865). Six specimens of this species, from Christmas Pass, exhibit no difference in either sex from typical Natalian examples \ 24. ACR^IA ENCEDON (Linn.). Papilio encedon, Linn. Mus. Lud. Ulr. Eeg. p. 244, n 63 (1764). There are only two examples of this widely-spread Ethiopian 1 I described (P. Z. S. 1891, p. 72) a single female taken in Ehanda, near the Upper Cunene River, presenting the aberration of a wide suffusion and coalescence of the black markings of the fore wings. This was the only example of A. acara in Mr. Eriksson's first collection from S.W. Tropical Africa • but in a second collection, made in the same region between the 15th November 1890, and the 1st March, 1891, out of a series of eight males and three females captured in three localities between the Cunene and the Ondonga Road, five |