ARCTIC THREE-TOED WOODPECKER. 
400. Picoides arcticus. 9.5 inches. 
Back glossy black, without any white. Only three 
- toes, two in front and one behind. ‘This is the most 
common of the two species found within the United 
States. They breed from the northern edge of the Union 
north to the limit of trees. 
AMERICAN THREE-TOED WOODPECKER. 
401. Picoides americanus. 8°4 inches. 
Back barred with white; outer tail feathers barred 
with black; yellow crown patch on male mixed with 
white. Except on some of the higher mountain ranges 
these birds appear in the United States only during 
winter. They are very hardy and commence nesting 
before snow leaves. 
Note.—A _ shrill, loud, nasal shriek, sometimes re- 
peated. 
Nest.—In holes of trees as is usual with Woodpeckers. 
The white eggs measure .95 x .70. 
