Myiarchus is a genus of tyrant flycatchers. Most species are fairly similar looking and are easier to separate by voice than plumage.Myiarchus flycatchers are fairly large tyrant-flycatchers at 16–23 cm (6.3–9 in) long. They are all partially crested with a brown to gray back and head, a rufous to blackish tail and yellow to pale underparts (only exception is the rufous flycatcher with rufous underparts).