Utah's Book Cliffs and Bird Migration

The specimen is much blacker than most breeding birds from Nova Scotia to Ontario, and compared with worn Newfoundland birds, loaned through Dr. H. C. Oberholser by the Cleveland Museum of Natural History, appears referable to nigrideus. Hitherto the species has been recorded three times in Greenland: Qornoq near Godthaab; Sukkertoppen and Graedefjord. H•rring and Salomonsen, 1941, p. 74, refer' the earlier records to T. m. migratorins Linnaeus, apparently without considering the then newly described race nigrideus. It is probable that all the records belong under the heading Turdus migratorins nigrideus Aldrich and Nutt. I am aware that occasional dark birds, as dark as nigrideus, occur in the populations of T. m. migratorins, as far west as the Mackenzie delta, and the Greenland specimen might be a dark example of migratorins, but it seems advisable to refer it to nigrideus on probability.