_Spring._--The spring migration, apparently directly northward from Mexico, seems to be quite prolonged. Dr. Alexander F. Skutch tells me that the last of the winter visitors do not leave Guatemala until about the first of May. Professor Cooke (1904) says that "an early migrating Townsend warbler was seen on April 9 in the Huachuca Mountains of Arizona. Migrants from Mexico begin to enter southern California April 14 to 20. * * * First arrivals have been reported from Loveland, Colo., May 11, 1889." And "the average date of the first seen during five years at Columbia Falls, Mont., is May 7." Mrs. Amelia S. Allen writes to me from Berkeley, Calif., that Townsend's warbler is an abundant fall and spring migrant in California, where it is also a common winter visitant. "In the spring they begin to increase about the middle of March, when singing flocks go through the live oak trees, feeding on the small oak worms. They become less conspicuous after the middle of April, but if there are rains in the first half of May to delay migrations, occasional flocks are seen. My latest date is May 17, 1915." Rathbun, in his Washington notes, writes: "In the spring of 1916, in the Lake Crescent region, a great majority of the individuals came in two distinct waves. The first occurred on April 28 and this lasted for two days, on the second of which the birds were less numerous. After an interval of a day on which we failed to see any of these warblers, there followed a second wave, on May 1, much larger than the one preceding. It consisted of hundreds of these warblers, together with individuals of other species, the main body of which followed the belt of deciduous trees along the shore of the lake. This fact we verified by ascending the adjacent mountain side to a considerable elevation during the movement, where we found but few birds. Descending to the lake level to note the migration, we found the birds close to the ground, the trees being of small size. As most of the Townsend's warblers were males in high plumage, the sight was most attractive. All were in constant song and flitting about with rapid movements. In their company were many chestnut-backed chickadees, a few Sitka kinglets, many Hammond's flycatchers, and now and then an Audubon's warbler and a red-breasted nuthatch. This movement began about half past eight in the morning and lasted until ten o'clock, when the number of birds began to diminish rapidly, and during the remainder of the day was inconsequential." On April 25, 1917, he saw a similar flight at the same place. "The day was rather warm and somewhat overcast, and the wave continued intermittently throughout the greater part of the day, the song of Townsend's warbler being much in evidence most of the time. In this movement the birds passed by in small detached companies at intervals, but the aggregate number was large."