118 
NEW-YORK FAUNA — BIRDS. 
THE OLIVE-SIDED KING-BIRD. 
Tyrannus cooperi. 
PLATE XXXIII. FIG. 73. 
(CABINET OF THE LYCEUM.) 
Muscicapa inornata et cooperi. Nuttall, Man. Orn. Vol. 1, p. 2S2. 
M. cooperi. Audubon, fol. pi. 174; Orn.Biog. Vol. 2, p. 422, and Vol. 5, p.422. 
Tyrannus borealis. Richardson, F. B. A. Vol. 2, p. 141. 
M. cooperi. Audubon, B. of Am. Vol 1, p. 212, pi. 58 (male and female). 
Characteristics. Dusky brown. Head darker, without a colored spot. Sides olive grey, 
lateral space beneath the wing white. Tail emarginate. 
Description. Bill stout, O'5 long and very broad. Upper mandible distinctly carinated. 
Second quill longest; first and third equal; the three first slightly attenuated towards the 
ends. Tail emarginate. 
Color. Dusky brown above. Wings and tail blackish brown, with a few of the tips and 
edges of the feathers of the wings margined with dusky white, often entirely plain. Crest 
plain, dark brown. Rictus bright yellow, as well as the inside of the mouth. Upper 
mandible black ; the lower horn-color. Chin and throat white ; breast and belly brownish, 
becoming tinged with yellowish towards the vent, and dusky olive on the sides. Legs and 
feet black. Iris dark hazel. Female and young , similar to the adult. 
Length, 6’5-7’0. Alar extent, 12‘5. 
This plain-colored species was discovered by William Cooper (from whom it derives its 
name) in 1829, and first described by Nuttall from Massachusetts (where it breeds), and sub¬ 
sequently by Richardson in 53° of north latitude. Audubon met with it in Texas and Georgia, 
and Nuttall subsequently observed it as a common species on the banks of the River Colum¬ 
bia. It probably winters in Mexico, and the main stream of migration is perhaps directed 
along the Pacific coast. It has been seen in New-Jersey ; and although it doubtless breeds in 
this State, I have not yet met with a specimen here. Its eggs are yellowish cream-white, 
with spots of reddish brown. Habits similar to those of the preceding. 
