Subgenus Chelostomopsis
The subgenus Chelostomopsis Cockerell is distributed both in the Palaearctic and the Nearctic region. It contains 3 described species, 2 of which occur in the Palaearctic.
Protosmia (Chelostomopsis) capitata (Schletterer, 1889)
1889 Chelostoma capitatum Schletterer, Zoologisches Jahrbuch für Systematik, 4: 647. Type material: f(f), “Nord-Afrika (Algier)” [Algeria].-Combination Heriades capitatus (Schletterer) in Friese (1911b: 17). Combination Chelostomopsis capitatus (Schletterer) in Tkalcu (1975a: 176).
1895 Chelostoma mystax Pérez, Espèces nouvelles de mellifères de Barbarie, p. 20. Type material: Syntypes mm, [Algeria], MNHN (Paris).-Combination Heriades mystax (Pérez) in Friese (1911b: 22).-Synonymy in Benoist (1928d: 107).
1897 Eriades trilobatus Friese, Entomologische Nachrichten (Berlin), 23: 194. Type material: Syntypes mm, “Algeria” [Algeria], ZMHB (Berlin) and NMW (Wien).-Synonymy in Benoist (1928d: 108).
Distribution-Europe: E, P. Northern Africa: DZ, MA, TN.
Identification-Keys, Descriptions: Friese (1898).
Nesting biology-Nesting site: Several males were observed to patrol dead wood indicating that insect burrows in dead wood are used as nesting sites. Nesting material: Unknown. (A. Müller, personal observation)
Flower preferences: Polylectic; pollen sources include Lamiaceae, Cistaceae, Carduoideae (Asteraceae), Brassicaceae and Crassulaceae (A. Müller, unpublished, based on 12 pollen samples from 9 different localities).
Protosmia (Chelostomopsis) longiceps (Friese, 1899)
1899 Eriades longiceps Friese, Entomologische Nachrichten (Berlin), 25: 326. Type material: Lectotype f, by designation of Griswold (1994a: 26), “Libanon” [Lebanon], ZMHB (Berlin).
1928 Heriades depauperata Benoist, Bulletin du Muséum d’Histoire Naturelle Paris, 34: 334. Type material: Holotype f, “Anatolie” [Turkey], MNHN (Paris).-Synonymy in Griswold (1994a: 26).
Distribution- Europe: GR, GR(Cr). Southwestern Asia: IL, JOR, RL, SYR, TR.
Identification-Keys, Descriptions: Griswold (1994a: 26); Mavromoustakis (1955b: 333-334).
Nesting biology-Nesting site: Individuals were observed at an old post indicating that insect burrows in dead wood are used as nesting sites. Nesting material: Unknown. (Morawitz, 1876)
Flower preferences: Polylectic; pollen sources include Fabaceae, Lamiaceae, Asteraceae (Carduoideae, Cichorioideae), Cistaceae, Boraginaceae, Crassulaceae, Caryophyllaceae and monocots (A. Müller, unpublished, based on 35 pollen samples from 21 different localities).