25 September 1983.
Durango, Mexico
Locality: Hwy 40, 51 km W of Durango, 0.5 km along the track to Barballones.
Coordinates: 24.0333, -105.1667
(Map it)
Elevation: 2630m.
Environment description: Predominantly pine, with oak and juniper; among rocks and branches along the track.