In the fall, the thickets and lower shrubbery along the streams, particularly those of the lower cañons, would fairly swarm with them during the early portion of the mornings, as they busily sought their food, in company with various insectivorous birds, especially the Black-capped Green Warbler (_Myiodioctes pusillus_) and Swainson's Vireo (_Vireosylvia swainsoni_). At such times they uttered frequently their sharp note of chip. The brightly-colored specimens representing _H. lutescens_ were prevalent in the western depression of the Basin, but were not observed eastward of the upper portion of the Valley of the Humboldt, nor at any locality during the summer; and wherever found, were associated with individuals of the other form, which is the only one found breeding on the mountains. It is therefore inferred that all these individuals were migrants from the northern Pacific Coast region and the Sierra Nevada, while those of _H. celata_ proper were from the higher portions of the more eastern mountains, or from farther northward in the Rocky Mountain ranges, full-fledged young birds being numerous in the high aspen woods of the Wasatch Mountains in July and August. VERMIVORA CELATA SORDIDA (Townsend) DUSKY ORANGE-CROWNED WARBLER PLATE 15 HABITS The subspecific characters of this warbler, as given by the original describer, C. H. Townsend (1890), are: "Adult male: Entire plumage decidedly darker than _H. celata lutescens_. Feet and bill larger; wings slightly shorter. There is an appearance of grayness about the upper plumage, owing to a leaden tinge on ends of feathers. Throat and under parts slightly streaked." The principal breeding range of the dusky warbler is on the Santa Barbara Islands off the coast of southern California, but it has also been known to breed in San Diego and probably breeds farther south in Baja California, and on the Todos Santos Islands, off that coast. The dusky orange-crowned warbler was discovered by Dr. Townsend on San Clemente Island January 25, 1889, but it does not seem to be so common there as on some of the other islands. According to A. Brazier Howell (1917) it has been reported from all of the channel islands except San Nicholas, which is too barren for it; and its occurrence on Santa Barbara Island is doubtful, as this precipitous island is not suited for it. It is probably commonest on Santa Catalina Island, "in the darker canyons and on the wooded hillsides."