48 WARBIJvR vSOXCiS. 



are raised in pitch more or less, in which case the accent is 

 likely to be spread over both, the third taking- rather more of 

 it. The song^ usually increases in \'olume as it proceeds. 



The tone is shrill, but loud and clear, and closely ap- 

 proaches a whistle, but having a suggestion of the Warbler 

 hiss. The bird throws his whole being 'into the utterance. 

 His perch is usually elevate<:l somewhat above the surrounding; 

 brush, while singing, but is seldom on the topmost twng. 



This species has a passion flight song which is delivered 

 much after the fa.shion of the Oven-bird, and is not unlike it 

 in being a medley of its call .song notes. 



The Maryland Yellow-throat arrives singing with the ho.st 

 of warblers in late April or early May. and sings well toward 

 August. After about a month's rest he resumes the song, but 

 ceases again about mid-September. Rarely one may hear the 

 .song all summer long. Mr. Bicknell regards the September 

 singing rare, but my record of four years shows no latex\ugu.st 

 singing, but alw^ays early in September full songs. 



The specific form is confined to the region east of the Mis- 

 .sissippi River and south of Hud.son Bay and Labrador. From 

 the Mi.s.si.s.sippi Valley to the Cascade Mountains it becomes 



"Western Yellow-throat. Geofhiypis fridias 

 occidcntalis. (iSla. 



And from Florida to southern Georgia the 

 Florida Yellow-throat. GeofJjlvpis fn'chas ioitofa. 681 b. 



The Pacific coast form is 

 Pacific Yellow-throat. Geofhiypis fricas arizda. (iS'lc. 

 It seems likely that the two .south -we.stern forms. 

 Belding's Yellow-throat. Gcothlypis bcldingi. (182. 

 which inhabits the southern part of Lower California, and 



Rio Grande Yellow-throat. Gcothlypis polioaphala 

 ralphi. ()S2.1. 



which is found in the lower Rio Grande Valley, are not 



