401b. Alpine three-toed woodpecker. Picoides americanus dorsalis. Resident; not common; a mountain bird; range, 8,000 to 12,000 feet; even in winter remains in the pine belt at about 10,000 feet.
402. Yellow-bellied sapsucker. Sphyrapicus varius. Rare migrant; eastern form, scarcely reaching the base of the Rockies.
402a. Red-naped sapsucker. Sphyrapicus varius nuchalis. Common summer resident; breeds from plains to 12,000 feet, but partial to the mountains. Author saw one at Green Lake.
404. Williamson's sapsucker. Sphyrapicus thyroideus. Common summer resident; breeds from 5,000 feet to upper limits of the pines; range higher in the southern part of the State than in the northern.
405a. Northern pileated woodpecker. Ceophlœus pileatus abieticola. Resident; very rare; only probably identified.
406. Red-headed woodpecker. Melanerpes erythrocephalus. Common summer resident; breeds from plains to 10,000 feet; late spring arrival; same form in the East and West.
408. Lewis's woodpecker. Melanerpes torquatus. Common resident; characteristic bird of the foothills; sometimes seen as high as 10,000 feet in southern Colorado; probably does not breed above 9,000 feet.
409. Red-bellied woodpecker. Melanerpes carolinus. Summer visitor; rare, if not accidental; eastern and southern species, not occurring regularly west of central Kansas.
412a. Northern flicker. Colaptes auratus luteus. Rare migrant; range extends only to foothills; no record of its breeding.
413. Red-shafted flicker. Colaptes cafer. Abundant summer resident; breeds from plains to 12,000 feet; almost as plentiful at its highest range as on the plains; early spring arrival; a few winter in the State.