24 
ZOOLOGY. 
23. SAYORNIS SAYUS, Baird, (p. 185.)—Say’s Fly-catcher. 
7228. Bill Williams’ Fork, New Mexico, February 10, 1854.—7233. Do. February 16, 
1854. (88, 170.) K. & M. 
We found this bird common in Texas and as far to the westward as the Great Colorado river. 
It built its nest under the cliffs along the stream, and in its notes, and in every other respect, 
closely resembles the common pewee, ( Tyrannula fusca .) 
24. SIALIA MEXICANA, S w a i n s o n , (p. 223.)—Western Blue Bird. 
7637. Camp 110, New Mexico, January 31, 1854. (60.) K. & M.—7635. Fort Conrad, 
New Mexico, October, 1853. (52.) Dr. Kennerly. 
We found this beautiful bird very abundant during our march up the Bio Grande, and from 
thence to the Great Colorado. At the time of which we write, from November to the latter 
part of January, they were always seen in large flocks, near the different streams that we 
passed. 
25. SIALIA ARCTICA, Swain son, (p. 224.)—Rocky Mountain Blue Bird. 
7607. 75 miles west of Albuquerque, November 1853. (15.) K. & M. 
26. REGULUS CALENDULA, Licht. (p. 226.)—Ruby-crowned Wren. 
7177. Camp 105, January 24, 1854. (55.)—7167. Camp 116, New Mexico, February 8, 
1854. (75.) K. & M. 
We found these beautifull ittle kinglets in the Aztec mountains, in the month of January, 
and along Bill Williams’ Fork in the month of February. They were found in the thickest 
bushes, and seemed always to be busily engaged in searching for their insect food and chirping 
as they hopped about. 
27. DENDROICA AUDUBONII, Baird, (p. 273.)—Audubon’s Warbler. 
7663. Cocomongo Ranch, California, March 19, 1854. (190.) 
This beautiful little bird was found by Dr. Woodhouse in the mountainous districts of New 
Mexico, but it did not attract our attention until we reached the border settlements of Cali¬ 
fornia. In the vicinity of the Cocomongo Rancho we found it very abundant among the low 
bushes in the month of March. The song of this bird somewhat resembles that of the summer 
yellow bird, ( Dendroica aestiva.) 
28. COTYLE SERRIPENNIS, Bonap. (p. 313.)—Rough-winged Swallow. 
6031. Camp 124, New Mexico, February 21, 1854. (176.) K. & M. 
We found this swallow very abundant along the Great Colorado river in the month of February. 
In its flight it resembles the common barn swallow (Hirundo rufa.) We did not have an 
oppo^qmji^y of noticing anything in connexion with its nidification, as the season, I piesume, 
had not yet arrived for nest building. 
