Dr. Coues found them a common summer resident in Arizona, where they arrived in the third week in April and remained until the middle of September. They were seldom found among pine-trees, but appeared to prefer ravines, hillsides, and creek bottoms. Some wintered as high up in the Colorado Valley as Fort Mohave. At Fort Whipple young birds were first observed early in July.
Dr. Cooper obtained one of this species at Fort Mohave, January 15, and is of the opinion that some may habitually winter in the Colorado Valley. In California they begin to arrive about March 10, and extend their range through very nearly the whole of the State. He describes their notes as few, loud, and harsh, but little varied, and uttered from time to time as they
fly after an insect from an accustomed perch, usually a lower dead limb of a forest tree. They prefer shady situations, and are said to feed late in the evening.
Mr. Ridgway met with this species in all suitable localities, from the Sacramento Valley eastward to the Wahsatch Mountains. It was most abundant among the oaks of the plains between the Sacramento River and the Sierra Nevada; but in the wooded river valleys of the interior, as well as in the cedar and piñon or mahogany woods on the mountains of the latter region, it was also more or less frequently met with. In its manners it is described as a counterpart of the eastern M. crinitus, but its notes, though generally similar in character, have not that strength which makes the vociferous screaming whistles of the eastern species so noticeable.
This species, or a very closely allied race of it (var. pertinax) was procured at Cape St. Lucas by Mr. Xantus. It had the peculiarities of a southern race, stronger feet, stouter bill, and a generally smaller size.
A few individuals of this species were found by Mr. Grayson inhabiting the islands of the Three Marias, on the Pacific coast of Mexico. He usually saw them among low bushes, darting from their perch after flies and other winged insects. They were very silent, and seldom uttered a note.
Four eggs of this species from Matamoras, collected by the late Dr. Berlandier, have the following measurements: .82 by .75, .91 by .71, .95 by .75, .98 by .75 of an inch. Though having a very close resemblance to the eggs of M. crinita, there are noticeable certain constant variations. The ground-color is a little lighter, and has a tinge of pinkish not found in the eggs of the eastern species. The markings are more in oblong plashes of irregular shape, and rarely exhibit the waving lines. There are more and larger blotches of a light purplish-brown. The eggs are a little more spherical in their general shape, and the markings are less abundant. The eggs of M. cooperi have a still more roseate tint in the buff of the ground-color, are marked with smaller blotches of bright purple and much larger ones of lilac-brown. They measure .92 by .75 of an inch.
Genus SAYORNIS, Bonap.
Sayornis, Bonap. ? Ateneo italiano, 1854.—Ib. Comptes Rendus, 1854, Notes Orn. Delattre.
Aulanax, Cabanis, Journal für Orn. 1856, 1 (type, nigricans).