2(i WARBLKR SONGS" 



the birds are familiar objects about the premises, and may also 

 nest about bridges which are in constant use. Dr. Thomas S. 

 Roberts has an interesting article in the July, 1899, Auk, in 

 which he figures nests of this bird in a bridge over the Missis- 

 sippi River opposite La Crescent, Minn. 



I find no evidence of a second song period. 

 ■ This Warbler is found over the eastern part of the country 

 west to Kansas and Nebraska and north into Minnesota, breed- 

 ing thruout its United States range. 



Sennett's "Warbler. Compsothlypis nigiilora. 649 



The only note relating to the song of this Warbler that I 

 have been able to discover is contributed by the discoverer, 

 Mr. George B. Sennett. He says of it: "Its notes are so 

 clear that the}^ can be heard at a long distance, and are readily 

 distinguishable from those of all other birds. There is thus a 

 marked departure from the type of the other member of this 

 genus. 



In the United States this species is confined to the valley of 

 the lower Rio Grande in Texas. ^ 



Black-throated Blue "Warbler. Dendroica 

 caridesceyis. (>54. 



This bird's versatility is one of his chief characteristics. 

 And the college campus birds seem to be rather more musical 

 and more versatile than those in the woods. Here, on the 

 campus, in one season, I have recorded the following varia- 

 tions : 



tu, cuu euu eeee-e-e, soft at first, loud and rattling at the close. 

 chivcu cJnveii chzvcji, uniform thruout. 

 chw' chw' chw' chwee, the last syllable strong and full. 

 twe twe twe z-z-z-z-z \ indistinct at first, gathering force 

 te zzvee zwee zzcee-e-e-e, { and closing high and shrill. 

 we zve z-z-Z'Z-z-z, harsh and penetrating. 



All writers agree that the song begins faintly, rapidly 

 gathering force until the shrilling climax of the last syllable 

 is reached. It is difficult to describe; but perfectly distinctive. 



The spring migrants are with us for two or three weeks in 

 May, singing during their stay, and returning in September 

 when thev rarelv sing. 



