07 September 1983.
Hidalgo, Mexico
Locality: Hwy 85, Zimapan to Tamazunchale, N of Barranca los Marmoles, about 3 km E along the track to La Encarnacion.
Coordinates: 21.0000, -99.1333
(Map it)
Elevation: 2460m.
Environment description: Pine-oak forest; among agaves, and along a rock wall at the lower edge of an old field.