---

Hello,
Maybe someone can tell me what species this is? I found them both in the garden today mating on a dandelion blossom.
Kind regards, Volkmar


Find data: Germany, North Rhine-Westphalia, D-59821 Arnsberg, 235 m, 27.4.2025.

---

I think it's not Osmia cornuta ?

---

I think it's Osmia bicornis: female with black last tergites and cornuta's male abldomen is red.

---

I'm not entirely sure about bicornis, maybe it's cornuta after all, I see two little horns on the female's head, what do you think?
The male's abdomen isn't red enough for me, and doesn't necessarily look faded either.

---

Here's another picture

---

Hello Volkmar, you may compare the Osmias here:
O. bicornis: https://www.wildb...-orufa.htm
O. cornuta: https://www.wildb...-ocorn.htm
Like O. bicolor these Osmias live in my garden since years.

---

Thank you Eric,
for now I archived the couple under Osmia spec..


Kind regards, Volkmar