1 to 18 members. Microstigmus is widely considered to be the only true eusocial species of apoid wasp. The species of Microstigmus ranges in length from...

flavolineata, use mud. A small group of eusocial crabronid wasps, of the genus Microstigmus (the only eusocial wasps outside the family Vespidae), also constructs...

de Saussure, 1892 Spilomenina Menke, 1989 Arpactophilus Smith, 1863 Microstigmus Ducke, 1907 Spilomena Shuckard, 1838 Xysma Pate, 1937 Stigmina R. Bohart...