Lampropeltis getula splendida
A mostly black subspecies of Lampropeltis getula, which generally doesn't cooperate well for photographs.
An adult male near the Rio Grande, Doña Ana County, New Mexico, 23 Jun 2007.
The same critter as above, with Lillis Urban, 23 Jun 2007.
Another view, 23 Jun 2007.
A subadult in Hidalgo County, New Mexico, 1 Sep 2008.