_Casual records._--There are a few records in extreme southern British Columbia, where it may breed occasionally. A pair were collected on April 22, 1913, on Schoonover Mountain, near Okanagan Falls; one was taken at Similkameen in June 1882, while Swarth (1917) records three from Midway. _Egg dates._--California: 14 records, May 27 to June 26. Colorado: 29 records, May 24 to June 24; 15 records, June 1 to 8, indicating the height of the season. SPHYRAPICUS THYROIDEUS NATALIAE (Malherbe) NATALIE’S SAPSUCKER PLATE 29 HABITS Harry S. Swarth (1917) is responsible for the recognition of this race, which seems to differ from the Williamson’s sapsucker of the Pacific coast in the same way that the northern white-headed woodpecker differs from the southern race of that species; he says: The differences are as worthy of recognition in one case as in the other. It is my suggestion here that the Rocky Mountain race of the Williamson Sapsucker be separately recognized on the basis of its lesser bill measurements as compared with those of _Sphyrapicus thyroideus thyroideus_ of the Pacific Coast. As regards a name for this form, there is already one that seems to be clearly available for use. A specimen from Mexico was designated by Malherbe (Journ. für Orn., 1854, p. 171) as _Picus nataliae_, and an example from any part of Mexico (save possibly from the mountains of northern Lower California) would assuredly be of the Rocky Mountain subspecies. Also in the measurements given by Malherbe, length of bill (“du bec, du front 20 millimeters”) places his bird unequivocally with this race. It is reasonably certain that in the Rocky Mountain region the species does not breed south of the Mogollon Divide, though it does occur as a common winter visitant in southern Arizona and over a large part of the Mexican plateau. These winter visitants, as shown by numerous specimens at hand, are migrants from the Rocky Mountain region to the northward, and not from the Pacific Coast region. So the name _nataliae_, as given by Malherbe to a Mexican specimen, can safely be used for the Rocky Mountain subspecies, which may therefore stand as _Sphyrapicus thyroideus nataliae_ (Malherbe). Mrs. Florence M. Bailey (1928), referring to the striking difference in plumage between the male and the female in this species, remarks: