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. 



