Agonum cyclifer is a species of ground beetles in the family Carabidae. It is found in Mexico and southwestern United States.
References
Further reading
Arnett, R.H. Jr., and M. C. Thomas. (eds.). (2000). American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia. CRC Press LLC, Boca Raton, FL. Arnett, Ross H. (2000). American Insects: A Handbook of the Insects of America North of Mexico. CRC Press. Richard E. White. (1983). Peterson Field Guides: Beetles. Houghton Mifflin Company.