Structures of Hylaeinae. a, Elevated upper supraclypeal area, marked by arrow in laterofrontal view of head of Hylaeus ellipticus (Kirby); b, Propodeal profile and side view of metasoma of Pharohylaeus lactiferus (Cockerell); c, Propodeal profile of Hylaeus (Macrohylaeus) alcyoneus (Erichson); d, Same, of Palaeorhiza (Callorhiza) stygica Michener; e, Same, of P. (Anchirhiza) mandibularis Michener; f, Same, of P. (Ceratorhiza) conica Michener; g, Propodeal profile and base of metasoma of Hylaeus (Analastoroides) foveatus (Rayment), female; h, Same, of Hylaeus (Hylaeorhiza) nubilosus (Smith); i, Base of metasoma of Hyleoides concinna (Fabricius), showing projection of S2; j, Base of metasoma of Hemirhiza melliceps (Cockerell); k, Same, of Hylaeus (Euprosopellus) dromedarius (Cockerell); l-o, Apices of hind tibiae of females of Hylaeus (Hylaeorhiza) nubilosus (Smith), Amphylaeus (Agogenohylaeus) nubilosellus (Cockerell), A. (Amphylaeus) morosus (Smith), and Meroglossa canaliculata Smith; p, Front tibia of Hyleoides concinna (Fabricius). a, from Michener, McGinley, and Danforth, 1994; b, from Houston, 1975a; c, from Houston, 1981a; dp, from Michener, 1965b. (source: Michener, 2007)