20 Porter, Nesting Habits of Birds in the Spring of 1907. [j^ 



just hatched. On June 10, in another woods, I saw a young of 

 the year just able to fly. These dates are if anything somewhat 

 earlier than my usual experience. Apparently these birds nested 

 without regard to the temperature. 



Setophaga ruticilla. The three sets found this year were not as 

 much later than the normal as most of the warblers. The dates 

 were June 8, incubation begun; June 16, incubation almost com- 

 plete; June 22, incubation advanced. The nest of June 8 was 

 half completed on May 21, was finished and birds not seen May 

 28, and had three eggs about two days incubated on June 8. 



Vireo olivaceus. This species breeds abundantly. Normally 

 two or three nests can be found any day from June 1 to June 15. 

 Eggs taken after June 12 have all been incubated. This year 

 only one nest was found, and that was building on June l5. They 

 were from two to three weeks later than usual. 



Vireo noveboracensis. These birds were not apparently much 

 later in commencing nesting, but took longer to build. 



May 25 found two nests about half finished ; May 28 no change 

 in appearance of either nest. June 4, birds hard at work at both 

 nests, which appeared to be completed. June 12, one nest had 

 four eggs, and the other three. In each case the bird was sitting 

 very close, and the eggs were fresh. 



June 1, found nest almost complete. June 9, one egg. I was 

 unable to visit this nest again. On the mornings of June 2 and 3, 

 the thermometer was at 45° F. 



Empidonax virescens. In the colony I reported in last year's 

 'Auk,' two nests were taken June 2, and one June 7. This year 

 I frequently saw several birds in the vicinity of the breeding site. 

 June 12, a nest was found commenced; June 16 it was completed; 

 June 22, three eggs with incubation just begun. These birds were 

 therefore from two to three weeks later than the same colony of 

 birds last year. 



Pipilo erythrophthalmus. This is another hardy bird. My 

 previous dates run from IMay 21 to June 5. These birds seemed 

 unaffected by the cold. I found five nests from May 28 to June 

 6. Two of the nests were six feet high in cedar trees. I have not 

 before foiuid this species nesting off the ground. The question 

 suggests itself whether these birds varied their usual nesting site 

 on account of the cold wet season. 



