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. Oilman 

 has found it breeding in La Plata co. (7,500 feet), in the extreme south- 

 west comer 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 I^ngbird, 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 sUght 

 crest ; tail never edged with white, but generally marked with rufoas 

 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. 



ICey of 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 cliiofiy dark- 



brown. M. 1. olivascens, p. 266. 



Ash-throated Flycatcher. Myiarchus cinerascens. 



A.O.U. Checklist no 454— Colorado Records— Aiken 72, p. 205 

 {M. mexicanua) 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 ; Oilman 07, p. 155 ; H. G. Smith 08, p. 185 ; 

 Rockwell 08, p. 166. 



