Schizocosa mccooki

Schizocosa mccooki is a species of wolf spider in the family Lycosidae. They can be found from the west coast to western Lake Erie in western North America, including Canada, the United States, and Mexico.

Description
Schizocosa mccooki is a large wolf spider with the body length ranging between 9.1–15.5 mm (0.35–0.61 in) for males and 9.6–22.7 mm (0.37–0.89 in) for females.

Similar species
S. maxima and S. mccooki are virtually indistinguishable except by size. S. maxima have a body length ranging between 16.1–20.3 mm (0.63–.08 in) for males and 21-28.4 mm (0.82–1.11 in) for females. Recent phylogenomic work suggests that S. maxima may be a junior synonym of S. mccooki, however formal nomenclatural changes are pending future studies.

Habitat
S. mccooki are widespread in open habitats such as grasslands, chaparral, the desert, and pinyon pine forests, among others. Some populations of this species have been observed digging burrows.