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This fly seems to have strong intraalar setae, which the Papp key puts to Minettia. But this seems wrong to me. Can someone ID this fly?

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If you are referring to the bristle in front of the corner of the scutellum, that is a postalar. A bristle in front of it would be considered intraalar.

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Is the definition of intralar seta wrong here: https://www.delta-intkey.com/anatox/morphol.htm Based on that the two rightmost setae in front of the scutellum would be intralar (the inner one) and postalar (outer one).

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If there are two strong setae on (on near) the line between the posteriior notopleural seta and posterior dorsocentral setae, then ia is present. If it is just one, it is absent. By looking at in that way, it is easier to judge presence or absence also in side view.

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That page describes terminology used in Tephritidae. The terminology used to distinguish Minettia (and New World relatives) from other Lauxaniidae is different. There is a second bristle, often weak, in front of the one adjacent to the scutellum. See Manual of Nearctic Diptera volume 2 page 957 figure 31.