Chris Shields / Illustration of British bumblebees (Bombus sp): (Across rows) Adrena fulva,Bombus hypnorum,B. terrestris,B. lacornum,B. pratorum,B. lapidarus,B. ruderatus,B. humilis,B. muscorum,B. barbutellus,B. sylv...

Andy Sands / Sharp-tail Bee (Coelioxys elongata) male feeding on nectar from Fleabane flower, Oxfordshire, England, UK, August

Andy Sands / Sharp-tail Bee (Coelioxys elongata) male feeding on nectar from Fleabane flower, Oxfordshire, England, UK, August

Andy Sands / Sharp-tail Bee (Coelioxys elongata) male feeding on nectar from Fleabane flower, Oxfordshire, England, UK, August

MYN / Clay Bolt / Leafcutter cuckoo bee (Coelioxys sp), Pickens, South Carolina Meetyourneighbours.net project

Clay Bolt / Leaf-cutting cuckoo bees (Coelioxys sp) entering the nest of her host, Pickens, South Carolina, USA, May.

Alan Williams / Bee (Coelioxys conoidea) female feeding on Common Fleabane (Pulicaria dysenterica) flower Cheshire, UK, August.

Andy Sands / Sharp-tailed bee (Coelioxys conoidea) cleptoparasite of Leaf cutter bee (Megachile maratima) these bees use their sharp tail to slice into the nest of the host leaf cutter bee to lay their eggs inside...

Andy Sands / Sharp-tailed bee (Coelioxys conoidea) cleptoparasite of Leaf cutter bee (Megachile maritima). This species uses their sharp tails to slice into the nests of the host leaf cutter bees to lay their egg...

Jose B. Ruiz / Leafcutter bee {Coelioxys sp} sleeping, clasped to plant by its mandibles, Spain

Jose B. Ruiz / Leafcutter bee {Coelioxys sp} sleeping, clasped to plant by its mandibles, Spain

Nick Upton / Shiny-vented sharp-tail bee (Coelioxys inermis) visiting an insect hotel, searching for Leafcutter bee (Megachile sp.) nests to parasitise, Wiltshire garden, UK. July.