NORTHERN THREE-TOED WOODPECKER. 
579 
It is remarkable, that a second species, so nearly allied 
to the present, as to have been confounded with it merely 
as a variety, is found to inhabit the woods of Guiana. In 
this, (the Picus undulatus of Vieillot,) the crown, howev- 
er, is red instead of yellow ; the tarsi are also naked, and 
the black of the back undulated with white. 
The length of this species is about 10 inches, and 16 in alar stretch. 
Iris bluish-black. Above glossy black, with green and purple re- 
flections. Throat, breast, and middle of the belly white ; sides of 
the breast, and flanks, thickly waved with black and white, as well 
as the femorals and tarsal feathers. Primaries marked on both webs 
with square white spots. Tail, 4 middle feathers plain black, the 
rest white, except 2, which are tipt with black ; the exterior feather, 
however, banded with black and white. Legs lead-color. 
