Christian Ziegler / Bumblebee Orchid (Ophrys bombyliflora) flower and its male Longhorn Bee (Eucera sp) pollinator, Sardinia, Italy

Heather Angel / Long-horned bee (Eucera sp.), two crawling into Wild gladiolus (Gladiolus atroviolaceus) flower to roost at night. Turkey. May.

MYN / Clay Bolt / Longhorn bee (Melissodes sp) male, Madison, Wisconsin, USA Meetyourneighbours.net project

MYN / Clay Bolt / Longhorn bee (Melissodes sp) male, Madison, Wisconsin, USA Meetyourneighbours.net project

MYN / Clay Bolt / Longhorn bee (Melissodes sp) female, Madison, Wisconsin, USA. Meetyourneighbours.net project

MYN / Clay Bolt / Longhorn bee (Melissodes sp) female Madison, Wisconsin, USA. Meetyourneighbours.net project

MYN / Clay Bolt / Long-horned bee (Eucera species) Photographed in Chatanooga, Tennessee, USA, April. Meetyourneighbours.net project

Chris Shields / Long-horned mining bee (Eucera longicornis) illustration of a male.

Christian Ziegler / Bumblebee Orchid (Ophrys bombyliflora) flower and its male Longhorn Bee (Eucera sp) pollinator, Sardinia, Italy

Rolf Nussbaumer / Longhorn bees {Eucera nigrescens} on Golden Crownbeard (Verbesina encelioides) Rio Grande Valley, Texas, USA

Nick Upton / Female Long-horned bee (Eucera longicornis), rare species in the UK surviving in a few dozen sites with rich flower meadows, near its nest site on sandy cliffs, The Lizard, Cornwall, UK. June.

Paul Harcourt Davies / Male Long-horned bee (Eucera longicornis) feeding on purple flowers, Umbria, Italy. June.