1054 Accepted by M. Buffington: 8 Sept. 2005; published: 27 Sept. 2005 1 ZOOTAXA ISSN 1175-5326 (print edition) ISSN 1175-5334 (online edition) Copyright © 2005 Magnolia Press Zootaxa 1054: 1–14 (2005) www.mapress.com/zootaxa/ A revision of the genus Xenochilicola (Hymenoptera: Apoidea, Colletidae), with the description of a new species JULIO A. GENARO* & LAURENCE PACKER** Department of Biology, York University, 4700 Keele St., Toronto ON, M3J 1P3, Canada. *jagenaro@yorku.ca ** bugsrus@yorku.ca Abstract The bee genus Xenochilicola (Colletidae: Xeromelissinae) is revised. Three species are recognized, with one described as new: X. haroldotoroi, only known from males. Xenochilicola fulva is proposed as a new junior synonym of X. diminuta. A key to species is provided. Key words. Hymenoptera, bee, Xenochilicola, new species, synonymy, key, Chile. Resumen Se revisa el género de abejas Xenochilicola (Colletidae: Xeromelissinae). Se reconocen tres especies y se describe una nueva: X. haroldotoroi, conocida sólo por los machos. Se propone Xenochilicola fulva como sinonimia menor de X. diminuta. Se presenta una clave para separar los machos. Palabras clave. Hymenoptera, abejas, Xenochilicola, especie nueva, sinonimia, clave, Chile. Introduction Xenochilicola is a genus of minute bees (Figs. 1–9), endemic to Chile (Michener, 2000). Toro and Moldenke (1979) described the genus, assigning to it three new species: X. mamigna, X. diminuta and X. fulva, and providing a key to separate them. The last two species were only known from one sex: male and female, respectively. Toro and Magunacelaya (1987) studied the femoral musculature of Xeromelissinae including X.