Ancistrocerus

thumb|200px|Ancistrocerus campestris on goldenrod thumb|200px|Ancistrocerus nigricornis in copula (video, 1m 50s)

Ancistrocerus is a widely distributed genus of potter wasps present in many biogeographical regions of the world. They are nonpetiolate eumenine wasps with a transverse ridge at the bending summit of the first metasomal tergum and with a low and opaque propodeal lamella completely fused to the submarginal carina.