Taxa named by Nicholas A. Mason

Asemospiza is a genus of South American birds in the tanager family Thraupidae.

Kleinothraupis is a genus of warbler-like birds in the tanager family Thraupidae. They are found in highland forest in South America.

Poecilostreptus is a genus of birds in the tanager family Thraupidae.

Stilpnia is a genus of Neotropical birds in the tanager family Thraupidae.