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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 |
