These Warblers go about their affairs in a quiet businesslike manner, suggesting the Lutescent Warbler and differ in temperament from the Calaveras and Audubon Warblers which are continuously in evidence. It lives in chapparal such as deer brush, wild lilac of various species, scrub oak and, sometimes, particularly in the humid coast districts, among evergreens. It is fond of the naborhood of clearings where it works constantly and carefully among low growth. Altho it does not force itself upon one's attention, it is a very active bird and during the day must cover considerable territory. (Fisher).
Unlike other Warblers they do not have an alarm note when the vicinity of their nests is approached, altho the scolding of the male, which is his contribution to the home building, can be taken as a guide to the nest's location.
Western North America from southern British Columbia south to northern Lower California, Arizona and New Mexico.