264 Birds of Colorado 
in Boulder co., and is rare at Barr. It is quite a common resident in 
Mesa co., arriving early in May and nesting a fortnight later. Gilman 
has found it breeding in La Plata co. (7,500 feet), in the extreme south- 
vest corner of the State. 
Habits.—Cassin’s Kingbird is found in very similar 
country and has very similar habits to its cousin, but 
is described as being more sedate and less lively in its 
disposition. Its notes, too, are more harsh and less fre- 
quently uttered. It builds its nest in cotton-wood trees 
as well as in pines and other trees, generally fixing it 
well out on a horizontal limb. It is sociable and fond 
of human habitations, often making use of gate frames 
or log fences in which to locate its nest. The eggs, 
three or four in number, resemble closely those of 
the Arkansas Kingbird, but are not usually so heavily 
spotted. 
Genus MYIARCHUS. 
Dull-coloured Flycatchers, of moderate size with wings measuring 
from 2-75 to 4-5; tips of the primaries not attenuated ; culmen about 
equal to or longer than the middle toe and claw; crown with a slight 
crest ; tail never edged with white, but generally marked with rufous 
or rusty. 
Of about thirty-five species and subspecies of this genus, which 
ranges over the whole of temperate and tropical America, one 
only is commonly met with in Colorado. 
& 
Key or THE Species. 
A. Larger; wing about 4; inner webs of the rectrices cinnamon. 
M. cinerascens, p. 264. 
B. Smaller; wing about 3-25; inner webs of rectrices chiefly dark- 
brown. M. 1. olivascens, p. 266, 
Ash-throated Flycatcher. Jfyiarchus cinerascens. 
A.O.U. Checklist no 454—Colorado Records—<Aiken 72, p. 205 
(M. mexicanus) Ridgway 73, p 184; Drew 85, p. 17; Morrison 89, 
p. 146; Lowe 92, p. 101; Cooke 97, pp. 87, 209; Warren 06, p. 21; 
08, p. 21; 09, p. 15; Gilman 07, p. 155; H. G. Smith 08, p. 185; 
Rockwell 08, p. 166. 
