Identified two flies as species of Empis that suck flowers, but the females also feed on small Diptera.
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The Charles Darwin Collection
The Darwin Correspondence Project is publishing letters written by and to the naturalist Charles Darwin (1809–1882). Complete transcripts of letters are being made available through the Project’s website (www.darwinproject.ac.uk) after publication in the ongoing print edition of The Correspondence of Charles Darwin (Cambridge University Press 1985–). Metadata and summaries of all known letters (c. 15,000) appear in Ɛpsilon, and the full texts of available letters can also be searched, with links to the full texts.
Identified two flies as species of Empis that suck flowers, but the females also feed on small Diptera.
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".
Identifies flies sent to him by CD. [CD note states that these were found with orchid pollinia adhering to them.]
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.
The horns and spines of homopterous insects do not vary between sexes. Sexual differences in Blattidae.
Chalcidites collected by CD are all similar to those of Europe. Mentions other specimens quite different from European forms.