ClipArt ETC
"- a, head of a (Polioptila nigriceps) Black-capped Gnat-catcher. b, head of a(Polioptila caerulea) Blue-gray Gnat-catcher. c, tail of (Polioptila nigriceps) Black-capped Gnat-catcher. d, tail of (Polioptila plumbea) Plumbeous Gnat-catcher" Elliot Coues, 1884

Black-capped Gnat-catcher

"- a, head of a (Polioptila nigriceps) Black-capped Gnat-catcher. b, head of a(Polioptila caerulea)…

"Grayish-blue, bluer on the crown, hoary on the rump, the forehead black, continuous with a black superciliary line. Edges of eyelids white, and above these a shade on the breast. Wings dark brown, the outer webs, especially of the inner quills, edged with hoary, and the inner webs of most bordered with white. Tail jet-black, the outer feather entirely or mostly white, the next one about half white, the third one tipped with white. Bill and feet black." Elliot Coues, 1884

Blue-gray Gnat-catcher

"Grayish-blue, bluer on the crown, hoary on the rump, the forehead black, continuous with a black superciliary…