88 Drew on Birds of Sa?i Juan County , Colorado. 
12. Certhia familiaris, Linn. Brown Creeper. — An abundant resi- 
dent; breeds. 
13. Telmatodytes palustris, Cab. Long-billed Marsh Wren. — 
Rare ; breeds ? ; found in September. 
14. Salpinctes obsoletus, Cab. Rock Wren. —Not rare; but no- 
where common. A splendid songster. Breeds; ranges to timber-line, 
and remains until October. 
15. Eremophila alpestris chrysolaema, Coties. Southwestern Lark. 
— Not common. Breeds on the higher peaks. In October small flocks of 
Larks descend into Baker’s Park; a few remain all winter, but the most 
go lower down. 
16. Anthus ludovicianus, Licht. Brown Lark. — Common; nests 
above timber-line, where in September both old and young may be found 
busily gleaning their food on the shores of sub-arctic lakes. In October 
they begin to descend and soon disappear. 
There is a great deal of variation in color in the Brown Lark. Some 
birds have not the least trace of a spotting on the breast, while others aro 
heavily spotted. Several nests, found at timber-line in July, were placed 
under the shelter of projecting stones. They were empty at the time, the 
young having just vacated them. 
17. Dendroeca auduboni, Bd. Audufon’s Warbler. — Abundant; 
breeds. A nest before me, taken June 26. is composed of soft, silky weed- 
fibres, which, by their color, give a silvery-gray appearance to the nest. 
Within it is well lined with feathers and cow-hairs, the latter predomina- 
ting. The nest contained four eggs in which incubation had begun. 
Color white, with a faint bluish tinge ; at the larger end, shell markings 
of lilac, and surface lines and blotches of rich brown and brownish black, 
form a wreath. Average size : — .019 X .013 mm. The nest was loosely 
placed among the needles on a horizontal spruce bough, about three feet 
from the ground. 
Their song is a pleasant little melody, in parts very similar to the song 
of D. cestiva. Remain from May until October. 
The bird’s tongue is finely cleft. 
18. Geothlypis macgillivrayi, Baird. MacGillivray’s Warbler. 
— Breeds. One specimen obtained, though I judge it is not uncommon; 
only shy. 
19. Myiodioctes pusillus. Bp. Green Black-capped Flycatching 
Warbler. — Of this little beauty I know nothing save that it nests here, 
and becomes common in August and September. 
20. Pyranga ludoviciana. Bp. Louisiana Tanager. — I found two 
which had wandered up into Baker’s Park, above the range of the pines. 
21. Iridoprocne bicolor, Cones. White-bellied Swallow. — Rare; 
breeds ; remains until September. 
22. Tachycineta thalassina, Cab. Violet-green Swallow. — Very 
abundant ; graceful on the wing, they cut but a sorry figure on the ground. 
Nests both in hollow trees and among the cliffs. In a tree which con- 
tained a small hollow with two openings, one six inches above and to one 
