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In the American key,

Posterior margin of postgena meeting occiput at acute angle; postgena with fine pale setulae. Mostly or entirely shiny black species, with setation much reduced ... Athyroglossa and Platygymnopa

Posterior margin of postgena meeting occiput at obtuse and broadly rounded angle; postgena usually with coarse black setulae. Shiny to dull species with setation usually well-developed ... other genera including Psilopa