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From John Blackwall   12 February 1868

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Summary

Variability of sizes and colours in spiders; on proportion of sexes; courtship of spiders.

Author:  John Blackwall
Addressee:  Charles Robert Darwin
Date:  12 Feb 1868
Classmark:  DAR 82: A78–9
Letter no:  DCP-LETT-5871

From John Blackwall   18 February 1868

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Summary

Proportion of sexes in spiders; coloration.

Author:  John Blackwall
Addressee:  Charles Robert Darwin
Date:  18 Feb 1868
Classmark:  DAR 86: A2–3
Letter no:  DCP-LETT-5892

From John Blackwall   10 August 1869

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Summary

Immature male spiders usually resemble in colour the females of their species of the same age. In some species colours of sexes differ when mature.

Author:  John Blackwall
Addressee:  Charles Robert Darwin
Date:  10 Aug 1869
Classmark:  DAR 82: 82–3
Letter no:  DCP-LETT-6860

From John Blackwall   8 September 1869

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Summary

His observations on young of Theridion lineatum reveal no characteristics distinguishing one from another;

quotes N. Westring on stridulation in Theridion serratipes [see Descent 1: 339].

Author:  John Blackwall
Addressee:  Charles Robert Darwin
Date:  8 Sept 1869
Classmark:  DAR 82: A80–1
Letter no:  DCP-LETT-6884
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1868 (2)
1869 (2)
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