268 Birds of Colorado 
year after year to build in the same place, which is usually 
under the eaves of barns or sheds, or under bridges, but 
generally in the neighbourhood of a ranche. In early 
days, before the advent of civilization, it made use of 
caves and overhanging banks for its nest. This is a 
bulky structure plastered up with mud, and generally 
lined with hair or wool, with a base of various materials. 
The eggs are usually four or five in number, rather short 
ovates in shape, and generally pure white. Two broods 
are often raised in one season. 
Say’s Phebe is a restless bird, constantly flicking 
its tail and raising its crest ; it is always on the move, 
looking out for insects, which almost exclusively form 
its food, and which it often catches on the wing ; like 
Owls, it rejects the hard parts of these in the form of 
pellets. The note is loud and somewhat plaintive. 
Genus NUTT ALLORNIS. 
Flycatchers of moderate size—wing about 4-0, with a very stout 
bill, the width of which at the nostrils exceeds half the length of the 
culmen ; wings long and pointed, the outer (tenth) primary exceeding 
the seventh distinctly ; tail short, about two-thirds of the length of the 
wing, plain coloured and emarginate; feet very small, tarsus shorter 
than the culmen and the middle toe and claw; « patch of silky white 
feathers on either side of the rump. 
Only the one species here described is assigned to this genus. 
Olive-sided Flycatcher. Nuttallornis borealis. 
A.O.U. Checklist no 459—Colorado Records—Allen 72, p. 158; 
Aiken 72, p. 206; Henshaw 75, p. 350; Scott 79, p. 94; Minot 80, 
p. 231; Drew 81, p. 140; Tresz 81, p. 183; Allen & Brewster 83, 
p- 195; Drew 85, p. 17; Morrison 88, p. 107; 89, p. 146; Lowe 
92, p. 101; 94, p. 268; Bendire 92, p. 282; Cooke 97, pp. 19, 
88, 201; Henderson 03, p. 235; 09, p. 232; Gilman 07, p. 155; 
Rockwell 08, p. 167. 
Description.—General colour above slaty-olive, feathers of the crown 
with darker centres; wings and tail dark brown, the former with the 
secondaries and greater coverts edged and tipped with whitish; below 
the chin and throat very pale yellowish; the centre of the breast, 
