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From Francis Walker 9 December 1867
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 |
Author
| Walker, Francis | (1) |
Addressee
| Darwin, C. R. | (1) |
