The Collaborative International Dictionary of English v.0.48:

Melospiza \Melospiza\ prop. n.
   A genus of American song sparrows and swamp sparrows.

   Syn: genus Melospiza.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Melospiza
    n 1: American song sparrow and swamp sparrow [syn: Melospiza,
         genus Melospiza]