The Texas (gray) wolf († Canis lupus monstrabilis) is a possible extinct subspecies of gray wolf, distinct from the Texas red wolf (Canis rufus var. "rufus"), whose range once included southern and western Texas and northeastern Mexico. It is darker than its more northern cousins, and has a highly arched frontal bone. As of 2005, it is considered a valid subspecies by MSW3, though it is classed as either a synonym of C. l. nubilus or C. l. baileyi by the United States Fish and Wildlife Service.