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In North America the defining characters of tribe Dexiini are

* Only one frontal bristle arising below upper margin of pedicel
* Pedicel with one or two exceptionally long slender setae which are more than half as long as arista
* Arista pubescent or plumose
* Subvibrissal ridge with five or more slender bristles usually continuous with bristles of subcranial margin.

See Manual of Nearctic Diptera page 1247. No doubt there are a few exceptions. The plumose arista alone will usually work.

In addition, Dexiini and Siphona account for most of the long-beaked Tachinidae in the Northern Hemisphere. (At least, most of the ones photographed.)