09 September 1958.
Zacatecas, Mexico
Locality: 4 miles S of Ojo Caliente; km 695 on the Aguas Caliente-Zacatecas road, 50 miles from Aguas Calientes.
Coordinates: 21.8833, -102.2500
(Map it)
Elevation: 2050m.
Environment description: E side of the highway in a maize field.