Crotalus molossus

My favorite of the rattlesnakes.

Hidalgo County, NM, 9/18/04.

Hidalgo County, NM, 9/18/04.

Hidalgo County, NM, 9/19/04.

Cochise County, AZ, 9/6/04.

An adult on the west side of the Organ Mountains, Doña Ana County, New Mexico, 11 Oct 2008.

The same critter as above, 11 Oct 2008.

An adult north of the Florida Mountains, Luna County, New Mexico, 25 Aug 2008.

An adult on Riley Peak, Doña Ana County, New Mexico, 24 Aug 2007.

The same critter as above, 24 Aug 2007.

A subadult in the Dragoon Mountains, Cochise County, Arizona, 6 May 2008.

The same critter as above, 6 May 2008.

An adult hiding under a rock on the west side of the Organ Mountains, Doña Ana County, New Mexico, 3 May 2008.

Cochise County, AZ, 9/6/04.

Hidalgo County, NM, 9/6/04. This guy started rattling at me from 10 feet away, otherwise I would've walked right by in the dusk.