A first phylogenetic hypothesis is proposed for Protopolybia Ducke, 1905 based on cladistic analysis of 31 species. New evidence in support of monophyly of the genus is presented. A revision of the Protopolybia exigua species-group is also presented. Protopolybia diligens (Smith, 1857), stat. resurr. is revalidated. Four new species are described: P. collombiana Santos, Silveira & Carpenter, sp...

Vol. XXXVIII (August 2001), 349–361 349 *Alexander Chernev is Associate Professor of Marketing (e-mail: ach@ kellogg.nwu.edu), and Gregory S. Carpenter is James Farley/Booz-Allen & Hamilton Professor of Marketing Strategy (e-mail: g-carpenter@kellogg. nwu.edu), Kellogg Graduate School of Management, Northwestern University. The authors thank Dawn Iacobucci, Angela Lee, Brian Sternthal, Alice Ty...