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From:
John Blackwall
To:
Charles Robert Darwin
Date:
10 Aug 1869
Source of text:
DAR 82: 82–3
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.

Contributor:
Darwin Correspondence Project
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From:
John Blackwall
To:
Charles Robert Darwin
Date:
8 Sept 1869
Source of text:
DAR 82: A80–1
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].

Contributor:
Darwin Correspondence Project
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