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Iis it possible to identify this Chrysops?

Thanks in advance,
Paul Hoekstra

http://observado....w/54226210

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Using the key by Philip (1955) I get Chrysops pallidefemorata Kröber. I do not know what this species looks like and I could be wrong. There is a group of Neotropical species with the irregular crossband of your fly.

Philip, C. B. 1955. New North American Tabanidae IX. Notes on and keys to the genus Chrysops. Revista brasileira de entomologia 3:47-128.

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Thanks a lot for your help! Chrysops pallidefemorata is on the checklist of Tabanidae of Quintana Roo: http://www.cicy.mx/Documentos/CICY/sitios/Biodiversidad/pdfs/Cap4/35%20Tabanos.pdf

Do you know if it is possible to download or buy the article you mention? It is out of print on amazon.com.

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With the key of Philip 1955 I now think it could be Chrysops scalaratus.

Of the southeast-mexican Chrysops, C. pallidefemoratus, C. scalaratus and C. auroguttatus have the irregular crossband.

C. scalaratus differs from the other 2 by having the abdomen quadrivittate and the outer margin of the crossband with step-like offset at vein R4+5. The other 2 species should have: "Abdominal pattern not quadrivittate although there is a median row of yellow triangles; outer margin may be sinuous, but not step-like".

I am not sure about the quadrivittate abdomen, but I think I see the step-like offset of the crossband at vein R4+5.

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I thought the abdomen was more clearly not quadrivittate than the wing band was stepped.

I don't think there is a modern key or revision. There is a key to species of Costa Rica but it does not include all the species of your region.

Burger, J. F. 2002. Description of five new species of Tabanidae (Diptera) from Costa Rica and revised keys to species for the genera Fidena Walker, Scione Walker, and Chrysops Meigen in Costa Rica. Proceedings of the Entomological Society of Washington 104:928-940.

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Thanks for your help!

I found some photos of Costa Rican Tabanidae : http://darnis.inb...&-Find including photos of Chrysops scalaratus and C. auroguttatus (but not C. pallidefemoratus). On those photos it looks like the quadrivittate pattern of the female is not very clear, and the wing pattern seems to coincide with the wing pattern of my photos of Chrysops. See this photo of the Costa rican site: http://attila.inbio.ac.cr:7777/pls/portal30//IMAGEDB.Get_bfile_image_old_code?p_oldimageId=35960&p_oldImageFile=6