Order Lagomorpha Author Robert S. Hoffmann text 1993 Smithsonian Institution Press Washington and London Editor Don E. Wilson Editor DeeAnn M. Reeder Mammal Species of the World (2 nd Edition) 807 827 book chapter http://doi.org/10.5281/zenodo.7353088 1-56098-217-9 7353088 Ochotona collaris (Nelson, 1893) . Proc. Biol. Soc. Washington , 8:117 . TYPE LOCALITY: "about 200 miles south of Fort Yukon, Alaska near the head of the Tanana River." [ USA ]. DISTRIBUTION: WC Mackenzie, S Yukon , NW British Columbia ( Canada ); SE Alaska ( USA ). STATUS: Not significantly threatened ( MacDonald and Jones, 1987 ). SYNONYMS: Monotypic. COMMENTS: Broadbooks (1965) and Youngman (1975) considered collaris and princeps conspecific. Corbet (1978c) , following Argyropulo (1948) and Gureev (1964) , included collaris in alpina . A statistical réévaluation of craniometric data by Weston (1981) indicated that collaris , princeps and alpina are separate species; Hall (1981:286) also recognized collaris as a distinct species. O. collaris and O. princeps share similar chromosome numbers that differ sharply from those of alpina and hyperborea ( Vorontsov and Ivanitskaya, 1973 ) . Reviewed by MacDonald and Jones (1987 , Mammalian Species, 281).