Female mandibles of three closely related Osmia (Melanosmia) species; left=mandible in front view, right=mandible from below: 21–22 O. pilicornis 23–24 O. inermis 25–26 O. parietina. Figures are not to scale.

 
 
  Part of: Prosi R, Wiesbauer H, Müller A (2016) Distribution, biology and habitat of the rare European osmiine bee species Osmia (Melanosmia) pilicornis (Hymenoptera, Megachilidae, Osmiini). Journal of Hymenoptera Research 52: 1-36. https://doi.org/10.3897/jhr.52.10441