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Baños de Agua Santa, Andes of Ecuador
Size as a common blowfly

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I think it's one of the Tachinidae - Winthemia?

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Many thanks eklans, I will look in this genus!

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I think it is at least Winthemiini. If it is Winthemia I do not see the details necessary to key it.

Reinhard, H. J. 1931. Revision of the American parasitic flies belonging to the genus Winthemia. Proceedings of the United States National Museum 79 (Art. 20) [= No. 2886]: 1–54 + 1 pl.

Coelho, Sonia M. P. et al. 1989. Chave e sinonímias para as espécies sul-americanas de Winthemia Robineau-Desvoidy (Diptera, Tachinidae) com descrição de três espécies novas. Revista Brasileira de Zoologia 6(2):271-296

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Thanks John! It's Sonia Coelho still active in entomology? Maybe she could recognize the fly by general appareance despite not being possible to key it?

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I know nothing about Sonia Coelho. Of the other coauthors Jose Guimarães died in 2008 and Claudio J. B. De Carvalho appears to be still working on Diptera: https://cjbcarva....odiversity.

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Thanks, I will try to contact Carvalho!