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Darwin, C. R. in correspondent 
Walker, Francis in correspondent 
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DCP-LETT-3053

From:
Francis Walker
To:
Charles Robert Darwin
Date:
1 Feb 1861
Source of text:
DAR 46.2 (ser. 3): 54–5
Summary:

Identifies two dipterous species of parasites [chalcidites].

Was not able to attend to the aphids last year, but will make use of CD’s suggestions and "study as much as I can the inquiry as to species".

Contributor:
Darwin Correspondence Project

DCP-LETT-10547

From:
Francis Walker
To:
Charles Robert Darwin
Date:
24 June [1862]
Source of text:
DAR 70: 182
Summary:

Identified two flies as species of Empis that suck flowers, but the females also feed on small Diptera.

Contributor:
Darwin Correspondence Project
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DCP-LETT-4014

From:
Francis Walker
To:
Charles Robert Darwin
Date:
26 Feb 1863
Source of text:
DAR 181: 3
Summary:

Identifies flies sent to him by CD. [CD note states that these were found with orchid pollinia adhering to them.]

Contributor:
Darwin Correspondence Project

DCP-LETT-5718

From:
Francis Walker
To:
Charles Robert Darwin
Date:
9 Dec 1867
Source of text:
DAR 82: A48–9
Summary:

The horns and spines of homopterous insects do not vary between sexes. Sexual differences in Blattidae.

Contributor:
Darwin Correspondence Project
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