Mecas is a genus of longhorn beetles found in North America, containing the following species:

subgenus Dylobolus

• Mecas rotundicollis (Thomson, 1868)

subgenus Mecas

• Mecas albovitticollis Breuning, 1955
• Mecas ambigena Bates, 1881
• Mecas bicallosa Martin, 1924
• Mecas cana (Newman, 1840)
• Mecas cineracea Casey, 1913
• Mecas cinerea (Newman, 1840)
• Mecas cirrosa Chemsak & Linsley, 1973
• Mecas confusa Chemsak & Linsley, 1973
• Mecas femoralis (Haldeman, 1847)
• Mecas humeralis Chemsak & Linsley, 1973
• Mecas linsleyi Knull, 1947
• Mecas marginella LeConte, 1873
• Mecas marmorata Gahan, 1892
• Mecas menthae Chemsak & Linsley, 1973
• Mecas obereoides Bates, 1881
• Mecas pergrata (Say, 1824)

subgenus Pannychis

• Mecas sericea (Thomson, 1864)

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