During his explorations in Northern Mexico, Lieutenant Couch first met with this species at Cadereita, Mexico, in April, occurring in abundance under the high banks of the stream which supplies the town with water. Its habits appeared to him to be much the same with those of the common Phœbe-Bird (Sayornis fuscus). Its nest was supposed to be in the bank. Dr. Kennerly, who found it at Espia, Mexico, could not observe any difference in the habits from those of the Pyrocephalus rubineus. They were both observed in the same vicinity, feeding alike on insects and having the same movements.
In the Department of Vera Cruz, Mr. Sumichrast says that this species is known by the common name of Aguador. It is very common in both the temperate and the colder regions of that State. It nests within the dwelling-houses in the city of Orizaba.
Dr. Kennerly states that after passing the mountains of California, and descending into the valley of the San Gabriel River, he found these birds quite abundant on the Pueblo Creek in New Mexico, though he had noticed none previously. They were generally found perched upon the summit of a bush, from which they would occasionally make short excursions in search of prey. At the season in which they were observed, March, they were rarely found in pairs, from which he inferred they were already hatching.
Dr. Heermann speaks of it as abundant throughout all California, and as constructing its nests in situations similar to those of the common eastern species (S. fuscus). It seems to have a marked predilection for the vicinity of streams and lakes, where it is nearly always to be seen, perched upon a stake or branch. It occasionally darts into the air for an insect, and returns to the same place to renew its watch and to repeat these movements. The nest, composed of mud and mosses and lined with hair, is placed against the rocks, the rafters of a house or bridge, or against the inside of a large hollow tree, and the eggs, four or five in number, are pure white, speckled with red.
Dr. Coues found this Flycatcher a very abundant and permanent resident in the valleys of the Gila and Colorado, and the more southern portions of the Territory of Arizona generally. It was not observed in the immediate vicinity of Fort Whipple, though it was detected a few miles south of that locality. As it has been found on the Pacific coast so much farther north than the latitude of Fort Whipple, he thinks it may yet be met with, at least as a summer visitant to that place. In his journey from Arizona to the Pacific, he ascertained that it is common throughout Southern Arizona, being, among land birds, his most constant companion on the route. Perched generally in pairs upon the dense verdure that in many places overhangs the river, it pursued its constant vocation of securing the vagrant insects around it, constantly uttering its peculiar unmelodious notes. In all its movements the Pewee of the Eastern States was unmistakably reproduced. It was rather shy and wary. In Southern Arizona and California it remains throughout the winter. It seems to delight not only in river bottoms, but also in deep mountain gorges and precipitous cañons with small streams flowing through them.
Dr. Newberry found this species quite common in Northern California, and specimens were also obtained as far to the north as the Umpqua Valley in Oregon. According to Dr. Cooper it is an abundant and resident species in all the lower parts of California, except the Colorado Valley, where he found none later than March 25, as they had all evidently passed on farther north. At San Diego, at that date, the following year (1862), all these birds had nests and eggs, and were there, as elsewhere, the first birds to build. Their nest, he states, is formed of an outer wall of mud about five and a quarter inches wide and three and a half high. It is built like that of the Barn Swallow, in little pellets, piled successively, as they dry, in the shape of
a half-cup. They are fastened to a wall, or sometimes placed on a shelf, beam, or ledge of a rock, but are always under some protecting cover, often under a bridge. They are lined with fine grass or moss, and horse or cow hair. The eggs, four or five in number, he describes as pure white, measuring .74 by .55 of an inch.
This bird is said to prefer the vicinity of human habitations, and also to keep about water, on account of the numerous flies they find in such situations. It will often sit for hours at a time on the end of a barn, or some other perch, uttering a monotonous but not unpleasant ditty, which resembles, according to Dr. Cooper, the sound of pittic pittit, alternately repeated, and quite like the cry of the eastern Sayornis fuscus, which is its exact counterpart in habits. It is said to fly only a short distance at a time, turning and dodging quickly in pursuit of its prey, which it captures with a sharp snap of the bill.
This species was met with by Mr. Ridgway only in the vicinity of Sacramento City, Cal., where it seemed to replace our eastern Pewee, having the same familiarity and general habits, and with notes not distinguishable from some belonging to S. fuscus.
The eggs of this species, as described by Dr. Cooper and by Dr. Heermann, are either pure white unspotted, or else white with fine red dots, in this respect resembling the eggs of the S. fuscus, which present the same variations. The measurements of those in my cabinet vary from .75 by .56 of an inch to .78 by .60.