1872.) 197 [Holden—Aiken. 
25. Dendroica auduboni. Audubon’s Warbler. 
These were rare, owing perhaps to the lack of small trees and 
shrubs such as they prefer; several were shot on the rocks where they 
acted more like Wrens than Warblers. I could not discover any of 
their nests though I searched long for them. 
<’ Rather common along the creeks in the foot-hills. First specimen 
secured April 16th.”—C. E. A. 
26. Dendroica nigrescens Bd. 
‘¢ Took a male, May 6th, and on May 21st I secured a pair. 
Fouud on the cedar hills.”,—C. E. A. 
27. Dendroica estiva. 
Arrived May 6th. Abundant along the creeks. 
28. Geothlypis trichas. 
“ Arrived May 5th. Common in damp places covered with bushes 
or grass.’—C. HE. A. 
‘29. Geothlypis macgillivrayii. 
‘¢ Found sparsely in about the same piagee as the preceding. First 
seen, May 17th.”—C. E. A. 
30. Icteria longicauda. 
“Arrives about May 5th, and soon becomes very common in the oak 
and cotton-wood thickets, on creek bottoms. Sings day and night.” 
—C. E. A. 
ol. Myiodioctes pusillus Bon. 
‘¢ First seen May 14th. Common for about ten days.”—C. E. A. 
32. Setophaga ruticilla. 
*‘ Saw a pair May 21st, and have noticed several others since.” 
—C. E. A. 
33. Petrochelidon lunifrons. Republican Cliff Swallow. 
On my way westward I saw several pairs of. these birds breeding in 
the eaves of almost every station house. I found large numbers breed- 
ing in the hills. ‘They were invariably in colonies; on one occasion I 
found a small number breeding on an almost perpendicular cliff about 
600 feet from the ground. I made my way to the top and by means 
of bushes, I let myself down upon a small projection about ten feet 
from the nests. Some were not completed and the birds flew down to 
the brook, and returned with small balls of mud; which they placed on : 
their habitations and went back at once for more; after watching them | 
awhile I broke a portion from one of the nests. ‘The birds on return- 
ing from the stream, fluttered before it for awhile and both birds rose 
high in the air and did not return for some time. The next day the 
