[519] Wallace on the Papilionidæ of the Malayan Region, in ‘Transact. Linn. Soc. vol. xxv. 1865, p. 8, 36. A striking case of a rare variety, strictly intermediate between two other well-marked female varieties, is given by Mr. Wallace. See also Mr. Bates, in ‘Proc. Entomolog. Soc.’ Nov. 19th, 1866, p. xl.
[520] Mr. R. MacLachlan, ‘Transact. Ent. Soc.’ vol. ii. part 6th, 3rd series, 1866, p. 459.
[521] H. W. Bates, ‘The Naturalist on the Amazons,’ vol. ii. 1863, p. 228. A. R. Wallace, in ‘Transact. Linn. Soc.’ vol. xxv. 1865, p. 10.
[522] On this whole subject see ‘The Variation of Animals and Plants under Domestication,’ vol. ii. 1868, chap. xxiii.
[523] A. R. Wallace, in ‘The Journal of Travel,’ vol. i. 1868, p. 88. 'Westminster Review,’ July, 1857, p. 37. See also Messrs. Wallace and Bates in ‘Proc. Ent. Soc.’ Nov. 19th, 1866, p. xxxix.
[524] ‘The Variation of Animals and Plants under Domestication,’ vol. ii. chap. xii. p. 17.
[525] ‘Transact. Linn. Soc.’ vol. xxiii. 1862, p. 495.
[526] ‘Proc. Ent. Soc.’ Dec. 3rd, 1866, p. xlv.
[527] ‘Transact. Linn. Soc.’ vol. xxv. 1865, p. 1; also ‘Transact. Ent. Soc.’ vol. iv. (3rd series), 1867, p. 301.
[528] See an ingenious article entitled, “Difficulties of the Theory of Natural Selection,” in the ‘Month,’ 1869. The writer strangely supposes that I attribute the variations in colour of the Lepidoptera, by which certain species belonging to distinct families have come to resemble others, to reversion to a common progenitor; but there is no more reason to attribute these variations to reversion than in the case of any ordinary variation.