Very little is known about the sand wasp, Bicyrtes variegatus , in the Galápagos archipelago. In this study, we compiled information from surveys, museum collections and the literature to better understand its distribution and ecology. We found records of B. variegatus on seven islands with the earliest known record from 1964, from San Cristóbal Island. Wasps have been collected in the littoral, arid, transition and humid vegetation zones and have been reported visiting endemic, native, cryptogenic, and introduced plants. Sun dances and a tight cluster of wasps, similar in form to what others have called “mating balls”, were observed in the hot season.