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From Francis Walker   24 June [1862]

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Summary

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

Author:  Francis Walker
Addressee:  Charles Robert Darwin
Date:  24 June [1862]
Classmark:  DAR 70: 182
Letter no:  DCP-LETT-10547

From Francis Walker   1 February 1861

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".

Author:  Francis Walker
Addressee:  Charles Robert Darwin
Date:  1 Feb 1861
Classmark:  DAR 46.2 (ser. 3): 54–5
Letter no:  DCP-LETT-3053

From Francis Walker   26 February 1863

Summary

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

Author:  Francis Walker
Addressee:  Charles Robert Darwin
Date:  26 Feb 1863
Classmark:  DAR 181: 3
Letter no:  DCP-LETT-4014

From Francis Walker   6 July [1838]

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Summary

Thanks CD for suggestions for improving his descriptions of species by indicating localities. With few exceptions the Chalcidites of South America and Australia are remarkably like European species.

Author:  Francis Walker
Addressee:  Charles Robert Darwin
Date:  6 July [1838]
Classmark:  DAR 205.3: 293
Letter no:  DCP-LETT-421

From Francis Walker   9 December 1867

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Summary

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

Author:  Francis Walker
Addressee:  Charles Robert Darwin
Date:  9 Dec 1867
Classmark:  DAR 82: A48–9
Letter no:  DCP-LETT-5718

From Francis Walker   10 December 1843

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Summary

Chalcidites collected by CD are all similar to those of Europe. Mentions other specimens quite different from European forms.

Author:  Francis Walker
Addressee:  Charles Robert Darwin
Date:  10 Dec 1843
Classmark:  DAR 205.3: 294
Letter no:  DCP-LETT-721
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letter (6)
Author
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1838 (1)
1843 (1)
1861 (1)
1862 (1)
1863 (1)
1867 (1)
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