2009:
Queretaro
Hidalgo
Sonora
Guerrero

2008:
New Mexico
Arizona
Michoacan, Guerrero
Texas, New Mexico
California
Arizona, New Mexico
Baja California peninsula/islands
Arizona California New Mexico
Mississippi Louisiana
Arizona Nevada
Guerrero
Colima

2007:
Arizona New Mexico
Arizona
Arizona California New Mexico
Nevada
New Mexico Texas
Jalisco
Arizona Utah
Arizona New Mexico Texas
Morelos Guanajuato
Oaxaca Guerrero
Guerrero
Utah
Michoacan

2006:
Chiapas
California Nevada
Nuevo Leon San Luis Potosi Tamaulipas
Coahuila
Chihuahua Sonora
Oaxaca
Arizona New Mexico
Pacific Coast of Mexico
Veracruz
San Luis Potosí, Hidalgo, Querétaro
Michoacan, Guanajuato

2005:
Oaxaca
Pueblo, Oaxaca
California, Nevada
Veracruz, Chiapas
Durango, Chihuahua
México, Nayarit, Jalisco, Colima
Michoacan, Aguascalientes, Zacatecas, Jalisco, Colima
Sonora,Baja California, Baja California Sur
Chiapas (II)
Chiapas (I)

2004:
Puebla, Oaxaca, Chiapas, Tabasco
Tamaulipas, San Luis Potosí, Veracruz, Puebla, Oaxaca
southern California
Baja California Sur
Arizona, New México, Baja California, Baja California Sur

2002:
Arizona, New México
D.F., Puebla, Veracruz, Oaxaca, Edo. México, San Luis Potosí, Tamaulipas, Hidalgo

U.S.A. (Arizona, California, New Mexico) 2008

6–12 May, 2008: funded by East Carolina University. Volunteer Zach Valois (Utah) and Brent E. Hendrixson (Postdoctoral Fellow, East Carolina University) flew into Las Vegas from Salt Lake City, Utah and Raleigh, North Carolina, respectively, for a trip of more than 1,700 miles through the desert communities of of southeastern California, southern Nevada, and the northern half of Arizona. Between blacklighting for scorpions until late into the night and searching for tarantulas at the crack of dawn, Valois and Hendrixson obtained only a few hours of sleep each night. In spite of fatigue, the trip was fairly successful. More than fifty scorpions were collected, representing six genera and at least 11 species, including Hadrurus obscurus, near the eastern extent of its range. Some populations of Hadrurus obscurus and H. spadix were found in some considerably sandy areas, as opposed to the rocky outcrops and escarpments in which these species are most commonly found.