There remains to be treated only three Warblers, and those all well known. They are the Chestnut-sided Warbler, (_D. pennsylvanica_,) the Black and White Creeper, (_M. varia_,) and the Maryland Yellow-throat, (_G. trichas_.) Of these the first entirely leaves the United States for the Winter; the second almost follows its example, a few remaining in Florida and some may remain even farther north, as (13) found it in December; but the last is a common Winter resident of all the Southern States. While the first does not stop to nest until Northern Illinois is reached, the other two nest from the Gulf northward. All three reach British America.
The Chestnut-sided Warbler reached (30) on 4-27, when an old male was seen, but no more until 5-2. About the middle of the month it was most numerous, and the last one left 5-24. At (43) it came 5-5 and four days later at (44.) In the timber they moved a little faster and appeared at (52) 5-7. The bulk of the males came 5-12, followed on the 17th by the females, the species then being at its height; two days later, on the 19th, nearly all left. A few remained to breed—about four to six pairs in as many square miles. One nest was found and the birds seen during all the month of June. Passing north (57) found them May 17, and (60) May 20, but as usual on the prairie (56) did not see them until later—May 24.
The Black and White Creeper migrated somewhat earlier. No. (35) found them for the first time on 4-10 and the next day they were quite numerous. On 4-14 the first arrived at (21,) being almost the only Warbler which was seen there before it was at (30,) at which place it did not appear until fifteen days later, on 4-29. After this they traveled faster, appearing at (41) and (52) on 5-3; at (51) and (57) on 5-7; and at (60) on 5-9. No. (45) found his first one 5-6. At both (30) and (52) they were numerous 5-5, but the height of the season at (52) was not until 5-12. The Maryland Yellow-throat was found by (13) all through the Winter, but though remaining so much farther north than most Warblers, it was no earlier in its migration. A few males came to (30) 4-17, and to (38) 4-29. No. (21) reports them 5-3; four days later (57) saw them and they reached (60) 5-12, and (56) 5-20. Some other dates, as for instance, (35) the first one on 4-30, (41) the first 5-8, and the first at (52) on 5-12, may be taken as later than the facts of the case, owing to the retiring habits of the bird and its not being sought in the marshy spots it usually frequents. At (30) 5-1 was the height of the season and four days later the transient visitors departed.—_W. W. Cooke, Ripon, Wisconsin._