Picus, Linn. Syst. Nat. 1748. (Type, Picus martius, L.)
Picus villosus.
884 ♂
Gen. Char. Bill equal to the head, or a little longer; the lateral ridges conspicuous, starting about the middle of the base of the bill; the basal elongated oval nostrils nearest the commissure; the ridges of the culmen and gonys acute, and very nearly straight, or slightly convex towards the tip; the bill but little broader than high at the base, becoming compressed considerably before the middle. Feet much as in Campephilus; the outer posterior toe longest; the outer anterior about intermediate between it and the inner anterior; the inner posterior reaching to the base of the claw of the inner anterior. Tarsus about equal to the inner anterior toe; shorter than the two other long toes. Wings rather long, reaching to the middle of the tail, rather rounded; the fourth and fifth quills longest; the quills rather broad and rounded.
In the genus Picus, as characterized above, are contained several subdivisions more or less entitled to distinct rank, and corresponding with peculiar patterns of coloration. Thus, taking the P. villosus as the type, P. borealis has proportionally much longer primaries; the spurious primary smaller; the bill is considerably more attenuated, and even concave in its lateral outlines. The wings are still longer in P. albolarvatus. The species may be arranged as follows:—
A. Black above, and white beneath. Wings spotted with white; a black maxillary stripe.
a. Two white stripes on the side of the head, one above, and the other below, the ear-coverts, which are mostly black. First quill shorter than sixth. Tail-feathers broad and obtuse at ends, the narrowed tips of middle feathers very short.
DRYOBATES, Boie. Middle of back streaked longitudinally and continuously with white. Maxillary and auricular black stripes not confluent; the latter running into the black of the nape. Beneath white without spots. Red of head confined to a narrow nuchal band.
1. P. villosus. Outer tail-feathers immaculate white, great variation in size with latitude. Length, 7.00 to 10.00.
All the quills, with middle and greater wing-coverts, with large white spots. Hab. Eastern North America … var. villosus.