Central and western México (Michoacan, Aguascalientes, Zacatecas, Jalisco, Colima): Two weeks (30 June–14 July, 2005), funded jointly by the NSF REVSYS project and the Instituto de Biología, UNAM. REVSYS collaborator Dr. Oscar Francke led this expedition to the Mexican states of Michoacan, Aguascalientes, Zacatecas, Jalisco, and Colima, accompanied by Dr. Javier Ponce (Universidad Michoacana de San Nicolás de Hidalgo), Milagros Córdova and Abigail Jaimes (undergraduate students from Universidad Autónoma de Morelos), Vinicius Capovilla (undergraduate student, Universidad Estadual de Campiñas, Sao Paulo, Brazil), and Gabriela Francke (undergraduate student, Universidad Católica, Lima, Perú). This trip covered ca. 4,000 km and visited the type localities of several scorpion species to obtain important material for DNA analysis, e.g. Paruroctonus gracilior, Vaejovis monticola, and V. punctatus spadix. About 1,000 scorpions were collected, including several potential new buthids, diplocentrids and vaejovids.