De nd.ro ica vigors! i 
Concord, Mass. Singing on wing. 
1896. One of the" Pine Warblers (two males pursuing a female, 
Apr. 16. probably) dashing about together through the branches of a 
white pine gave while on the wing the usual song to which, 
however, was added a prelude consisting of a short series of 
low chips and warbled notes given in a hurried, somewhat 
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I 
stuttering manner and in general character very similar to 
the preludes of other Warblers which sing on the wing. In- 
deed when the bird began I thought for an instant that it was 
an Oven-bird. Neither Faxon nor I have ever heard a flight 
song from the Pine Warbler before this occasion. The bird 
sang but once - at about 8 A.M. of a clear hot morning. 
V 
