Covers at least 280,000 sq km. Widespread through CA.Savage, J. 2003. Revision of the genus Thricops Rondani (Diptera: Muscidae). Ins. Syst. Evol., Suppl. 61, 143 pp.; Huckett, H.C., 1965. The Muscidae of Northern Canada, Alaska, and Greenland (Diptera). Memoirs of the Entomological Society of Canada, 97(S42), pp.5-369.