TEXAS: Jeff Davis Co; TX 166/scenic loop - July 2021
TEXAS: Jeff Davis Co; Rock Canyon - June 2020
TEXAS: Jeff Davis Co; on FM 505 - September 2017
NEW MEXICO: Hidalgo Co; on NM 9, near jct NM 80 - September 2016
TEXAS: Presidio Co; NE of Big Bend Ranch State Park - June 2016
NEW MEXICO: Hidalgo Co; SW of Lordsburg - September 2011
likely a hybrid with Crotalus viridis
TEXAS: Presidio Co; SW of Marfa - July 2009
MEXICO: Nuevo Leon; near La Ascencion - July 2008
MEXICO: Coahuila; between San Antonio de las Alazanas and Saltillo - August 2007
TEXAS: Presidio Co; Sierra Vieja Mts - May 2007
TEXAS: Brewster Co; north of Christmas Mts - July 2006
TEXAS: Brewster Co; near Alpine - neonates - July 2006
TEXAS: Jeff Davis Co; west of Fort Davis - August 2003 (scan from slide)
TEXAS: Culberson Co; north of Van Horn - August 2002 (scan from slide)
TEXAS: Brewster Co; Black Gap - July 2002 (scan from slide)