To B. D. Walsh 9 June 1868
Down. | Bromley. | Kent. S.E.
June 9. 1868
My dear Sir
I am very much obliged for your letter of May 1st, chiefly about Anthocaris.1 I had already introduced this genus into my M.S. discussion, but I shall probably be very glad to make use of the new facts which you have given me.2
It has occurred to me that you might perhaps whilst collecting, observe one subject for me without much trouble. I have lately been examining the stridulating apparatus in lamellicorns; & I am surprized to find it in a totally different position in Oryctes & Geotrupes.3 I have not yet examined enough specimens, but the organ seemed more developed in the male Oryctes than in the female.4 Now if you catch any m. & f. lamell. will you observe whether the f. can squeak or grate, or whether it does so louder than the male. If so, could you send me a m. & f. named. Does Trox exist with you? As far as I can make out with dead specimens, it grates by rubbing the spinose tibia of middle legs on the edges of the Elytra; & it seems to have no proper stridulating apparatus.5
Many thanks for your Report. I agree with your criticism on my expression; as far as I remember I used it merely because others might make a similar objection.6
This Report of yours must have cost you an immense quantity of labour. I am still at work & shall continue so for many months on the sexual differences of animals.7
With all good wishes believe me | my dear Sir | yours sincerely | Charles Darwin
Thanks BDW for new facts about Anthocaris [see 6156].
Asks BDW to observe stridulation apparatus in male and female lamellicorns.
- Letter no.
- Darwin, C. R.
- Walsh, B. D.
- Sent from
- Source of text
- Field Museum of Natural History, (Walsh 13) Chicago
- Physical description
Please cite as
Darwin Correspondence Project, “Letter no. 6236,” accessed on 7 December 2016, http://www.darwinproject.ac.uk/DCP-LETT-6236