The Collaborative International Dictionary of English v.0.48:

Colemouse \Cole"mouse`\, n. (Zool.)
   See Coletit.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coletit \Cole"tit`\ or Coaltit \Coal"tit\, n. (Zool.)
   A small European titmouse (Parus ater), so named from its
   black color; -- called also coalmouse and colemouse.
   [1913 Webster]