This bird, though widely different in appearance from scalaris, may nevertheless, without any violence, be regarded as but one extreme of a species of which the lighter examples of scalaris (bairdi) are the other, the transition towards nuttalli being through var. scalaris, var. graysoni, and var. lucasanus, each in that succession showing a nearer approach to the distinctive features of nuttalli. We have not seen any intermediate specimens, however. The pure white instead of smoky-brown nasal tufts, and their greater development, are the only characters which show a marked difference from the varieties of scalaris; but the other differences are nothing more than an extension of the black markings and restriction of the red in the male, the result of a melanistic tendency in the Pacific region.
Habits. This species was first discovered by Dr. Gambel near Los Angeles, Cal., and described by him in the Proceedings of the Philadelphia Academy. Afterwards, in his paper on the birds of California, published in the Academy’s Journal, mistaking it for the P. scalaris of Wagler, he furnished a fuller description of the bird and its habits, and gave with it illustrations of both sexes. So far as now known, it appears to be confined to the regions in California and Oregon west of the Coast Range, extending as far south as San Diego, representing, in its distribution on the Pacific, the P. borealis of the Atlantic States. One specimen in the Smithsonian collections was obtained on Umpqua River, in Oregon Territory; the others at Santa Clara, San Francisco, Petaluma, Bodega, and Yreka, in California. Dr. Woodhouse says, in his Report on the birds of the Zuñi and Colorado expedition, that he has only seen this bird in California, from which region he has examined numerous specimens. Dr. Heermann, in his Report on the birds of Lieutenant Williamson’s expedition, states that this Woodpecker is occasionally found in the mountains of Northern California, but that it is much more abundant in the valleys. Dr. Gambel found it abundant in California at all seasons. He describes it as having the usual habits of Woodpeckers, familiarly examining the fence-rails and orchard-trees for its insect-fare. He found it breeding at Santa Barbara, and on the 1st of May discovered a nest containing young in the dead stump of an oak, about fifteen feet from the ground. The hole for entrance was remarkably small, but inside appeared large and deep. The parents were constantly bringing insects and larvæ.
Dr. Cooper states that this Woodpecker is quite abundant towards the coast of California, and among the foothills west of the Sierra Nevada. It frequents the oaks and the smaller trees almost exclusively, avoiding the coniferous forests. It is very industrious, and not easily frightened, when engaged in hammering on the bark of trees allowing a very near approach. At other times, when pursued, it becomes more wary and suspicious. April 20, 1862, Dr. Cooper discovered a nest of this bird near San Diego. It was in a rotten stump, and was only about four feet from the ground. He captured the female on her nest, which contained five eggs of a pure pearly whiteness.
These birds are said to remain throughout the year in the valleys, and to migrate very little, if at all. Dr. Cooper has not observed it west of the Coast Range, except near Santa Barbara, nor has he seen any around gardens or orchards. None have been observed north or east of the State. East of the mountains it is replaced by the scalaris.
Mr. Xantus mentions finding a nest containing two eggs in a hole in the Cereus giganteus, about fifteen feet from the ground. The excavation made by the bird was about a foot and a half deep and six inches wide.
This Woodpecker Mr. Ridgway saw only in the Sacramento Valley, where, in June, it appeared to be a common species among the oaks of the plains. He did not learn anything of its habits, but describes its notes as very peculiar, the usual one being a prolonged querulous rattling call, unlike that of any other bird known to him.
Subgenus PHRENOPICUS, Bonap.
Phrenopicus, Bonap. Consp. Vol. Zygod. Ateneo Ital. 1854. (Type, Picus borealis, Vieill.)
Phrenopipo, Cab. & Hein. Mus. Hein. 1863, 70. Same type.
This subgenus is closely related in external form to the preceding, differing in rather longer and more pointed wings and tail, the latter especially, and a very small, short bill. The first quill (excluding the spurious one) is considerably longer than the sixth, not shorter. The tail-feathers are much attenuated at end. The most marked differences in coloration of the type species, P. borealis, consists in the absence of the post-ocular black patch, leaving the whole auricular region white, and in the restriction of the red to a very narrow line on each side, usually concealed.