Engel, Michael S.2010-05-172010-05-172010-05-17ZooKeys 46: 61-70https://hdl.handle.net/1808/6212A new species of Chlerogas Vachal (Halictinae, Augochlorini) is described and figured from Bolivia, correcting a past mis-association of sexes for Chlerogas boliviensis Brooks & Engel. Chlerogas aterrimus sp. n. is described from two males and a single female collected in the Department of Santa Cruz (Provinces of Florida and Caballero) and is distinguished from C. boliviensis, known only from females, and its other congeners. A revised key to the species of Chlerogas is provided along with a new locality record for C. boliviensisen-USEntomologySystematicsBiodiversityBeesTaxonomyAndesArticle10.3897/zookeys.46.460openAccess