Male is unique dark gray-blue above with a white throat, thin black chinstrap, and white undersides and tail base (often flashed when in flight). Female is plainer, dark brown above and lighter tan brown below, with a rufous-tinged tail; weak contrast and overall dark coloration distinguish her from other brown female flycatchers. Breeds in high-altitude and foothill forests and descends downhill to winter in scrubby areas, often in second growth. Often forages close to the ground. Song consists of an endless series of high, whistled “chee-chee-wit!”, often given from a low, hidden perch. Also gives hard, resonant “tak” notes.