On numerical proportions of sexes in insects; coloration. Dimorphism in dragonflies (Agrion) in which usual coloration is reversed in sexes [see Descent 1: 362–4].
Wallace seems to ride his hobby too hard.
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The Darwin Correspondence Project is publishing letters written by and to the naturalist Charles Darwin (1809–1882). Complete transcripts of letters are being made available through the Project’s website (www.darwinproject.ac.uk) after publication in the ongoing print edition of The Correspondence of Charles Darwin (Cambridge University Press 1985–). Metadata and summaries of all known letters (c. 15,000) appear in Ɛpsilon, and the full texts of available letters can also be searched, with links to the full texts.
On numerical proportions of sexes in insects; coloration. Dimorphism in dragonflies (Agrion) in which usual coloration is reversed in sexes [see Descent 1: 362–4].
Wallace seems to ride his hobby too hard.
Reports that when August Meyer confined several distinct species of Phryganeidae they coupled and produced fertile ova, indicating that some specific characters are not so important so far as reproduction is concerned [see Descent 1: 342 n. 2].