Howard Ensign Evans was a brilliant ethologist and systematist for whom the joy of science included lying on his belly in some remote location, digging out and diagramming a wasp’s nest. During his career, Evans described over 900 species and authored more than a dozen books, both technical and popular, on a wide range of entomological and natural history subjects. Upon his death in 2002, he left behind an unfinished manuscript, intended as an update (though not a revision) of his classic 1966 work, . Kevin O’Neill, Evans’s former student and coauthor, has completed and enlarged Evans’s manuscript to provide coverage of all sand-wasp tribes in Evan’s earlier book. The result is a tribe-by-tribe, species-by-species review of studies of the Bembicinae that have appeared over the last four decades. already has been hailed by specialists as a new bible for those working on solitary wasps and an essential reference for scientists more broadly interested in insect behavioral evolution.