12 BUIXETIN OK THE 



day. These were the last ones taken or seen, as the next day I spent in 

 packing" for a thirty-live mile ride to Roscommon. This day really ended 

 a very interesting and successful licld trip after Kirtland warblers, in 

 tneir sunnner home in Crawford and Oscoda counties, during which 1 

 had heard and seen sixteen adult birds. In ten days 1 had secured two 

 pair of birds with their nests, seven young and one egg; also fcjur adult 

 males, making lifteen birds in all. 



We may then estimate that the colony contained thirteen pairs of birds, 

 with their increase, and assuyiing that each nest contained on an average 

 four young, we have iifty-two young birds. Adding to this the number of 

 the parents, twenty-six, gives an estimated total of seventy-eight (78) birds 

 in the area described. Taking from this the number of birds secured leaves 

 sixty-three, the number estimated to 1k' left in the colony, although it is 

 hardly probable that 1 found all the birds in this colony. 



Whether they return to this location next year, no one can say, as they 

 have not nested here for more than three, or at the most four years, because 

 it was all burned over six years ago (about 1897) and everything destroyed 

 but a few old trees and stubs. Next spring another hre is liable to occur, 

 in which case this colony will liaxe to choose another nesting site, which 

 will probably be the place nearest to their site of this year where the con- 

 ditions are favorable. 



On the morning of July IGth it was very cold, (an overcoat being neces- 

 sary for comfort) as we returned overland to Roscommon. T had hoped 

 to see or hear more of D. hirtlcmdi. I did see spots where the conditions 

 seemed very favorable, but 1 did not see or hear the birds. In concluding 

 this life history of these birds I am inclined to think the Au Sable river is 

 the southern boundary of their breeding area and that this area extends 

 over the greater part of the Canadian zone of Michigan, Wisconsin and 

 perhaps Minnesota. They will probably be found breeding in favorable 

 localities in the Upper Peninsula of Michigan, but 1 should not expect them 

 north of Lake Superior. 



I still consider this bird as rare, and only to be found breeding in small 

 colonies, and only in the jack pine plains in favorable localities. .\11 that I 

 found were on the first and second terraces north of the Au Sable river. 

 One pair was only one-fourth mile from the river, and the farthest two 

 miles. All of these birds were near some road that was used by teams 

 or stock, and they seem to prefer such places for nesting and breedin.i?. 

 They sing constantly in June and July by the roadside, so they may be 

 easily found by driving through the plains at this time. I did not find a bird 

 over one-fourth of a mile from a road, or under conditions other than those 

 described. This history of the Kirtland's warbler is in the main copied from 

 my field notes, written with the birds before me. 



In concluding this paper 1 give the data for 2!! birds, all taken in Michi- 

 gan and records of 8 others seen, thus making a total of ?,\ birrls. This 

 number of records surpasses that of all other states. 



1 & 2—1870, Purdie, TT. A., Bull. NuH. Orn. Club, TV, 1870. pp. I-S.k Two 

 females coll. by A. P>. Covert. Ann Arb(-)r. Mich., May ]5, 1875 and 



. May 16, 1879. 



