228 
Minot on Colorado Birds. 
and three fourths as deep. It recalls a coarse type of our Chestnut-sided 
Warbler’s architecture, while the eggs suggest the Prairie Warbler’s. 
These, four in number, are white, rather finely marked about the crown 
with lilac and neutral tints, only one being somewhat blotched with 
brown, and average .75 X .55 of an inch. 
21. Myiodioctes pusillus pileolatus, Ridg. Wilson’s Black- 
cap. — A common summer resident, frequenting high willow swamps. 
One pair, however, I found established by a brookside near Manitou. 
About the Seven Lakes these birds are locally numerous. In one swamp 
there, June 22, 1 found about a dozen unsuspicious males, who kept much 
together in the shrubbery, as if a colonial troop, quarrelling playfully a 
good deal, fly-catching little, and" touching the ground occasionally. Face, 
cheeks, and all or part of the bill, rich golden-yellow. Song, chee-chee - 
chee-chee (or this syllable repeated seven times), thus different from their 
song as I recall it from the East. Certain low querulous notes are inde- 
scribable. Here, June 22, I found a nest and five fresh eggs. The nest 
was sunken in the ground, on the eastern slope or border of the swamp, 
at the end of a partly natural archway of long dry grass, opening to the 
southward, beneath the low, spreading branch of a willow. It is composed 
of loose shreds, with a neat lining of fine stalks and a few hairs, and with 
a hollow two inches wide and scarcely half as deep. The eggs measure 
about .60 X .50 of an inch, are bluntly pointed at the smaller end, and are 
white (brownish when unblown), freckled with dull ferruginous-brown 
and insignificant lilac, chiefly and thickly at the larger end, three on and 
two about the crown. The nursery of the Black-cap, if this example is 
typical, is most like the Black-and-white Creeper’s ; but it is unique. 
22. Setophaga ruticilla, Swain. Redstart. — Boulder, May 31, 
quite numerous in one grove, and apparently but just arrived. At Mani- 
tou, a few are summer residents about the creek below. 
23. Pyranga ludoviciana, Bp. Crimson-headed Tanager. — 
At Boulder, in the latter part of May, common ; and observed at much 
higher points. I found them much in creek shrubbery, perching low, and 
(the female more especially) suggesting a Flycatcher. The couples kept 
close, like a newly engaged pair, and were very tame, allowing me within 
two or three yards. Chatter more musical than the Scarlet Tanager’s ; but 
song nearly or quite indistinguishable. The birds were often silent, sing- 
ing but occasionally, and then perhaps in a low, meditative voice, or 
uttering a soft, tremulous che-we' as they flew. May 27, they invaded the 
town in abundance, frequenting gardens and fields, and perching on fences. 
Several inhabitants, including “ the oldest,” spoke of them as a new kind. 
At Manitou 1 found them few. 
24. Tachycineta thalassina, Cab. Violet-green Swallow. — 
Common summer residents of local abundance, ranging up to timber line, 
and nesting indifferently in hollow trees and porous rocks (or even, says 
Mr. Trippe, under eaves). When I saw them among the White-bellied 
