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Show 922 DR. A. G. BUTLER ON BUTTERFLIES [Dec. 4, over and round the bushes and so difficult to take : finally I have got the better of them by going after them in the afternoon, when they are tired with their day's play and so inclined to rest." (R. C.) One perfect example was chased for ten minutes before it could be captured. 34. BYBLIA ILITHYIA. Papilio ilithyia, Drury, 111. Exot. Ent. ii. pi. xvii. figs. 1, 2 (1773). 2, Eoromo, Kikuyu forest, Jan. 12 ; 8, Euarka Eiver, April 25, 1900. Of the female Mr. Crawshay writes :-" A n insect unknown to me, I think"; and of the male:-"A new arrival on the scene; until the last day or two I have not come across one." 35. BYBLIA GOETZIUS. 2 • Papilio goetzius, Herbst, Natursvst. Schmett. ix. p. 193, pi. 258. figs. 3, 4 (1798). . cf, Euarka Eiver, April 25, 1900. I quite agree with Prof. Aurivillius that B. vulgaris is only a variety of this species and B. acheloia the dry form ; but I regard B. castanea, boydi, and anvatara as representative species : I am quite sure that the last two are so, whatever B. castanea may prove to be. 36. ACR^A ALICIA. Acrcea alicia, E. M . Sharpe, Ann. N . H . (6) v. p. 442 (1890). 2 , Nairobi forest, March 18 ; cf cf, Euarka Eiver, 5500 feet, April 15, 1900. Of the female Mr. Crawshay says :-" The only one of its kind I have seen here. This insect does not succumb to 90 per cent. cyanide in an hour-cyanide which suffocates every other Lepi-dopteron in 25 to 30 seconds." Of the male he writes :-" Simply in swarms on the m u d on the rocks in the bed of the stream; dies very hard in the cyanide-bottle." W e have so few examples of this pretty species that I much regret the fact that only the female noted above, tw7o good males, and one which lost its antennae on the journey, were sent home. 37. ACRJEA ENCEDON. Papilio encedon, Linnaeus, Syst. Nat. ed. 10, i. p. 488 (1758). 2 , var. Igcia, Fabr., Nairobi plains, 5400 eet, M a y 4, 1900. " Unfortunately, with m y fingers shaky after a night's fever, I have destroyed one of the antennae when pinching this specimen- all the more regrettable as I do not know this Acrcea unless it be a variety of some known species." (R. C.) Var. daira, Godm., 8 8,2i Nairobi plains, March 28, M a y 4, 1900. " Plentiful on the grass-land round m y tent these days, newly |