BLACK-THROATED GREEN WARBLER. 



Dendroica virens. 



Char. Male in spring : above, briglit olive; line on sides of head rich 

 yellow; wings and tail dusky; wing-bars and outer tail-feathers white; 

 beneath, white tinged with yellow; throat and chest rich black. Male in 

 autumn, female, and young: similar, but black of throat mixed with 

 yellow, sometimes obscured. Length 5 to 5^ inches. 



Nest. On the border of heavy woods, in fork of coniferous tree 30 to 

 50 feet from the ground; of twigs, grass, etc., lined with hair and down. 



Eggs. 3-4; white or creamy white wreathed around larger end with 

 spots of brown and lilac; o 65 X 0.50. 



This rather rare species arrives from its tropical winter- 

 quarters in Pennsylvania towards the close of April or begin- 

 ning of May. About the 1 2th of the latter month it is seen in 

 this part of Massachusetts ; but never more than a single pair 

 are seen together. At this season a silent individual may be 

 occasionally observed, for an hour at a time, carefully and ac- 



