ZOOLOGY. 
26 
bushes in the valleys. While singing it was perched upon some small tree or bush. We 
frequently saw it seeking food upon the ground and when approached too nearly did not generally 
fly away, hut running very rapidly soon disappeared among the weeds or bushes. 
34. CATHERPES MEXICANUS, Baird, (p. 357.)—White-throated Wren. 
7110. Camp 116. Bill Williams’ Fork, February, 1854. (66.) K. & M. 
Among the hills bordering the Big Sandy, where the rocks were piled up thick and high, we 
found this little bird darting from rock to rock and creeping among the crevices with great 
activity, and keeping up continually its singular notes. The rapidity of its motions around the 
rocks rendered it difficult to procure a specimen. We did not observe it elsewhere. 
35. CERTHIA AMERICANA, Bonap. (p. 372.)—Creeper. 
7154. Pueblo creek, New Mexico, January 22, 1854. (47.) K. & M. 
This little creeper attracted my attention particularly in the Aztec mountains, where we 
found it very abundant among the rough-barked cedars. Its retreat was generally discovered by 
hearing its quick and sharp notes, and then by a close and careful search it was generally seen 
proceeding leisurely upwards and downwards, in straight or spiral lines towards the top of 
the tree, dodging dexterously to the opposite side from the observer, and only resuming his 
occupation when assured of solitude and safety. 
36. SITTA ACULEATA, Cassin, (p. 375.)—Western Nuthatch. 
Plate XXXII, Fig. 3. Fig 4 represents the head of S. carolinensis. 
6807. One hundred miles west of Albuquerque, New Mexico. (26.) Kennerly and Mollhausen. 
We found this little bird quite abundant among the pines of the Sierra Madre, and frequently 
afterwards in the mountains that we crossed. When seen he was generally busily engaged in 
searching for food on the trees, passing up and down and around, accompanying his motions 
with his peculiar notes. 
37. SITTA PYGMAEA, Vigors, (p. 378.)—California Nuthatch. 
6804. Cold Spring, Rocky mountains, November 17, 1853. (22.)—6803. San Francisco 
mountains, New Mexico, December 27, 1853. 
This little bird we found quite abundant in the Sierra Madre and San Francisco mountains, 
even high up where the snows were deep. Here he still lingered to seek his insect food on the 
lofty pines. After leaving this latter range of mountains, however, we did not observe this bird 
again. 
38. POLIOPTILA PLUMBEA, Baird, (p.382.) 
Plate XXXIII, Fig. 2. 
7189. Camp 119, Bill Williams’ Fork, New Mexico, February 11, 1854. (91.)—Camp 113, 
February 5, 1854. (70.) Kennerly & Mollhausen. 
First described from these specimens. 
