Osmia (Hemiosmia) Tkalců, 1975

Müller, Andreas, 2020, Palaearctic Osmia bees of the subgenera Hemiosmia, Tergosmia and Erythrosmia (Megachilidae, Osmiini): biology, taxonomy and key to species, Zootaxa 4778 (2), pp. 201-236 : 202

Subgenus Osmia (Hemiosmia) Tkalců, 1975

Morphological diagnosis

Osmia (Hemiosmia) species are nonmetallic, robust and medium-sized bees (8–12 mm) with punctiform parapsidal lines, a largely polished basal area of the propodeum and tergal hair bands, which—depending on the species—are distinctly or sparsely developed, foxy red or whitish and continuous or interrupted. Diagnostic character of the females is a large median tooth on the lower inner margin of the mandible in combination with a strongly carinate trochanter of the fore leg. The metasomal scopa is either foxy red, yellowish-red or whitish. Unifying characters of the males are two lateral teeth and one or two median teeth at the apical margin of tergum 6 rendering tergum 6 three- or four-toothed ( Fig. 5–7 ), and a rather small tergum 7, which is hidden under tergum 6. As in most males of Osmia , sternum 2 is more or less enlarged, sternum 3 is medially both emarginate and fringed and sternum 6 lacks membraneous basal flaps. The male of Osmia spinicoxa spec. nov. differs from the males of the other O. ( Hemiosmia ) species in that tergum 6 lacks median teeth ( Fig. 13 ).

Figures

FIGURES 1–7: Osmia (Hemiosmia). 1: Female of O. balearica on Lotus creticus (Fabaceae; photo V. Haeseler). 2: Female of O. uncicornis digging out nest burrow in loose soil (photo V. Haeseler). 3: Excavated brood cells of O. uncicornis. 4: Copulating pair of O. balearica (photo V. Haeseler). 5–7: Male terga 5–6 of O. uncicornis (5), O. argyropyga (6) and O. difficilis (7).

FIGURES 8–13: Osmia (Hemiosmia) spinicoxa spec. nov.. 8: Female. 9: Erect spine arising from posterior side of female middle leg coxa. 10: Trochanter of female middle leg. 11: Anterior side of trochanter of female hind leg. 12: Male genitalia. 13: Male terga 6–7. 14: Male sterna 1–6.