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From Francis Walker 24 June [1862]
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 |
