Megachilinae

Key to Eocene Tribes of Megachilinae View in CoL View at ENA

1. Basal area and lateral surface of propodeum areolate (figs. 2B, 3B, 3D, 4B, 4D, 4E); mandible with apical tooth and large edentate preapical margin (figs. 5I–L).............. 2

—. Basal area and lateral surface of propodeum imbricate to punctate, never areolate (e.g., fig. 4A) ; mandible multidentate (tridentate in females, bidentate to quadridentate in males) [Baltic, Bitterfeld, Rovno, Oise; five extinct genera, 1 extant genus ( southern Africa )]............ Ctenoplectrellini Engel

2. Mesoscutellum rounded, not projecting posteriorly over metanotum or propodeum (figs. 2B, 3B, D, 4B, D, E); compound eye hirsute (fig. 2A); metatibial spurs slender (fig. 4A, D); metanotum simple (figs. 2B, 4E); mesoscutum and mesoscutellum with large, craterlike punctures (figs. 2B, 3B–D, 4B–E) [Baltic, Bitterfeld, Rovno; one extinct genus, Glyptapis Cockerell ]................. Glyptapini Cockerell

—. Mesoscutellum flat, extending posteriorly as shield over metanotum and basal area of propodeum (figs. 15, 16A); compound eye bare (fig. 14A); metatibial spurs thickened (fig. 18B); metanotum bituberculate medially; mesoscutum and mesoscutellum with dense, strong, small punctures (fig. 15) [Fushun; one extinct genus, Glyptosmia , n. gen.]............... Glyptosmiini Engel , n. tribe