Melanodexia is a peculiar New World Cluster fly genus of the western United States.

Species List:

• ''Melanodexia californica Hall, 1948
• Melanodexia glabricula (Bigot, 1888)
• Melanodexia grandis Shannon, 1926 (Synonyms: M. pacifica Hall, 1948)
• Melanodexia idahoensis (Hall 1948)
• Melanodexia nox (Hall, 1948)
• Melanodexia satanica Shannon, 1926
• Melanodexia tristina (Hall, 1948)
• Melanodexia tristis Williston, 1893