RECORD: Darwin, C. R. n.d. Rhopalocera / Heterocera [numbers of males and females table]. CUL-DAR81.84-86. Edited by John van Wyhe (The Complete Work of Charles Darwin Online, http://darwin-online.org.uk/)

REVISION HISTORY: Text prepared and edited by John van Wyhe 2.2022. RN1

NOTE: See record in the Darwin Online manuscript catalogue, enter its Identifier here. Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volumes CUL-DAR80-86 contain material for Darwin's book Descent of man (1871).


84

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84v

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85

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So that on average if a male cost 100, a female cost 149 — or the price of male to female is as 100 to 149; consequently by standard for every 100 females there wd be 149 males.

(Species & Vars  (are they all European?) So that the price of each female on average being called 100, a male costs only

There are in list of 300 of butterflies, & of these 113 differ in prices by sex: that males in all cases but one being the cheapest or commonest Mr D. says probably many are bred.—

(D. O. Staudinger Lepidopteren — Domblatten Lists no. X. Dec. 1866.—)

85v

So that on average if a male cost 100, a female cost 149 — or the price of male to female is as 100 to 149; consequently by standard for every 100 females there wd be 149 males.

(Species & Vars  (are they all European?) So that the price of each female on average being called 100, a male costs only

There are in list of 300 of butterflies, & of these 113 differ in prices by sex: that males in all cases but one being the cheapest or commonest Mr D. says probably many are bred.—

(D. O. Staudinger Lepidopteren — Domblatten Lists no. X. Dec. 1866.—)

86

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86v

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So that on average the price of males to that of females is as 100 to 143: consequently by the standard for every 100 female moths there must be 143 males.—

There are about 2000 species & vars. Of Heterocera moths in catalogue. Exchange those with Aplennes females of these 141 differ by sexes in female; in only 11 the males are dearer than females; in 130 the males are cheaper in proportions given. However sexes do not differ apparently in number as often in moth as with butterflies & difference not quite so great & this agrees with less apparent results of sexual selection.—

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So that in these 11 for every 100 females there would be only 74 males.

The exceptional cases of male moths dearer than females.—

Are these beautiful??


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Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)

File last updated 3 July, 2025