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the first week in January, in 1884, drove it southward from all but the 

 most favorable localities. About twenty birds remained through Jan- 

 uary at Saint Louis, and not quite so many at Manhattan, Kans. It 

 was not until the middle of March that the northward movement com- 

 menced. This was marked at Caddo, Ind. Ter., by the return of the 

 birds from the bottom lands, whither they had been driven by the cold, 

 to the edges of the prairie. There was scarcely any increase in numbers 

 until April 1. At more northern localities the first wave was marked 

 by the arrival of more birds. This wave reached latitude 39° the 

 last week of March, but was stopped by the heavy snow-storms of the 

 first week in April and made no further advance until the middle of 

 the month. Out of the nineteen records of arrival at stations between 

 latitude 39° and latitude 45° but two mentioned any Yellow-rumps 

 before April 16. But on that and the two following days they appeared 

 in large numbers over the whole of these 200,000 square miles. What 

 an incredible number of Yellow-rumps must have been moving on those 

 three days! The same wave brought the bulk to the region south of 

 latitude 39°, and another two weeks carried it up to latitude 45°, mak- 

 ing the species, for the time being, one of the most numerous birds of 

 the Upper Mississippi Valley. Having now passed over the land of 

 spring-time and reached a country still ruled by winter, they checked 

 the hurriedness of their flight and did not reach Portage La Prairie 

 Manitoba, until the first week in May. A few breed in northern Min- 

 nesota, but the bulk pass on to breed in British America. A curious 

 incident occurred in the migration of this species at Heron Lake, in 

 southwestern Minnesota. On March 18 there arrived an immense flight 

 of Ducks, all coming from the west as if from the Missouri Valley. 

 Together with them, or at least on the same day, came great flocks of 

 Blackbirds and "a large flight of Yellow-rumps in fine feather and 

 song." Where they came from is a mystery. A competent observer 

 on the Missouri Biver southwest of Heron Lake did not find the species 

 common until nearly two months later, and no station south or south- 

 east reported them at all until three weeks later, nor at Heron Lake 

 was the arrival of the bulk noted until thirty-three days afterwards. 

 It would seem to be a case of a flock caught up by some upper-air cur- 

 rent and carried farther than they intended. While most of the-birds 

 left central Illinois the first week in May, some very late migrants were 

 seen at Whitehall May 21. 



In the fall of 1834 the first note of the Yellow-rumped Warbler came 

 from the edge of its breeding-grounds at Elk Biver, Minn., where the 

 bulk arrived September 9 ; the bulk left October 8, and the last Novem- 

 ber 5. The first was noted from Des Moines, Iowa, October 18 5 the 

 balk October 21, and the last October 25. At Mount Oarmel, Mo., the 

 first was reported September 27 ; departure of bulk October 22, and 

 last seen November 3. During the winter of 1884-85 no reports were 

 received of irregular wintering of the Yellow-mraps ; except from Man- 



