The Collaborative International Dictionary of English v.0.48:
Bluecap \Blue"cap`\, n.
1. (Zool.)
(a) The bluepoll.
(b) The blue bonnet or blue titmouse.
[1913 Webster]
2. A Scot; a Scotchman; -- so named from wearing a blue
bonnet. [Poetic] --Shak.
[1913 Webster]