The variations in this species are very slight, being chiefly in the shade of the yellow patch on the crown, which varies from a sulphur tint to a rich orange. Sometimes there is the faintest trace of a whitish post-ocular streak, but usually this is wholly absent. Western and Eastern examples appear to be identical.
PLATE L.
1. Picoides arcticus. ♂ Nova Scotia, 26923.
2. Picoides americanus. ♂ New Brunswick, 39143.