'^°19^8^^'] Porter, Nesting Habits of Birds in the Spring of 1907. 17 



the last few days of May. This year's record shows a marked 

 departure from the normal as follows : — 



May 28, found a nest just finished; June 4, this nest had three 

 eggs; June 8, it had four eggs, in which incubation had just begun. 



May 28, found nest just finished. June 4, this nest had two 

 eggs; June 8, it had three fresh eggs. 



June 6, found nest with one egg; June 10, four fresh eggs. 



June 6, found nest with two eggs. June 10, five fresh eggs. 



June 6, found nest just finished. June 10, three fresh eggs, 

 female sitting very close. 



June 10, found nest, six eggs, incubation just begun. 



June 15, found nest, four eggs, incubation five or six days ad- 

 vanced. 



June 15, found nest with one egg. 



June 15, found nest with two eggs. 



I was unable to get out after June 15, and therefore could not 

 watch these last two nests, or take any later notes. The first full 

 set of eggs, however, was June 8, and the average date for a full 

 set of fresh eggs could apparently be put at June 10 or 12, or about 

 two weeks later than the average. 



While the data are not so satisfactory as to deposition of eggs, 

 it appears that in one case, the set was not complete in nine days, 

 only three eggs having been laid, in another four eggs were laid in 

 about eight days, in three others three eggs in four days, the latter 

 all toward the end of the season. 



I did not find any nests of this species in process of construction. 



Dendroica pensylvanica. I have invariably found these eggs 

 from May 29 to June 1. This year the birds were seen abundantly 

 on May 11, and I took a set of fresh eggs June 10, and another 

 somewhat incubated June 15. Aside from the later nesting aver- 

 ages, the chief interest in this species is connected with building 

 times. 



May 23, found one nest completed and another just commenced, 

 the birds being hard at work. Both nests were abandoned, although 

 the birds were seen around for some weeks, and neither nest was 

 apparently disturbed. 



May 27, found nest half complete, birds hard at work. May 

 30, there was no apparent change, and the nest was apparently 



