V. flavifrons

from The Collaborative International Dictionary of English v.0.48

Greenlet \Green"let\, n.
   1. (Zool.) One of numerous species of small American singing
      birds, of the genus {Vireo}, as the solitary, or
      blue-headed ({Vireo solitarius}); the brotherly-love ({V.
      Philadelphicus}); the warbling greenlet ({V. gilvus}); the
      yellow-throated greenlet ({V. flavifrons}) and others. See
      {Vireo}.
      [1913 Webster]

   2. (Zool,) Any species of {Cyclorhis}, a genus of tropical
      American birds allied to the tits.
      [1913 Webster]