Feb., 1847.] 155 



I afterwards found it common, frequenting in small flocks tall bushes and 

 branches of small trees, uttering a weak and slender tsee day day, tsee day 

 day dait. 



Parus montanus, Nobis. Rocky Mountain Titmouse. Proceed. Acad. 

 Nat. Sc, vol. 1, p. 259. 



I have already stated all that I know of this new and handsome species, in 

 the description contained in the number of the Proceedings above referred to. 

 It was exceedingly abundant in the western ranges of the Rocky Moun- 

 tains, particularly in the high ridges near the great salt lake, in the wooded 

 portions of which they were roaming in large flocks, and from thence to the 

 Californian ridge, on the other side of which I never saw them. In habits, 

 as well as appearance, it resembles very much the P. atricapillus, but is at 

 once distinguished by the two white lines, running over the top of the head 

 to the occiput. 



Parus rufescens, Towns. Chestnut-backed Titmouse. 

 In the latter part of summer and during the winter season, the young of 

 this species are found around Monterey in large flocks. 

 Parus minimus, Towns. Least Titmouse. 



This interesting and most diminutive bird, is exceedingly abundant in 

 the Rocky Mountains and California. During winter, the otherwise cheer- 

 less woods, are alive with busy, noisy troops of these industrious birds, 

 gleaning their scanty fare in company with the Ruby-crowned Kinglet, in 

 every possible manner and position from bush or tree. 



It is curious to watch them in this anxious solicitous search for food, keep- 

 ing up a continual twittering; so intent are they in their employment, that 

 they appear to lose sight of danger, and often have I been so surrounded 

 by a flock, that I could have almost caught them in my hands. 



The above additional species, together with the P. scptcntrionalis, recently 

 described by my friend Mr. Edward Harris, in the Proceedings of the Aca- 

 demy, have increased the number of North American Titmice, exclusive of 

 the Ground Tit, to nine species. 



Trichas Marylandica. Maryland Yellow Throat. 



This species, distributed throughout the whole of North America is com- 

 mon, both in the Rocky Mountains and California. 



Vermivora celata, Say. Orange-crowned "Warbler. 



Flocks of this species are common during winter in Upper California, 

 frequenting low bushes and margins of streams. On the Island of Santa 

 Catalina in early spring I heard its simple though lively song, commencing 

 in a loud sweet shrill and ending tshg up, sometimes considerably varied, 

 but generally er r r r r r tsl\4 up. 



Sylvieola Auduboni, Towns. Audubon's Warbler. 



This handsome warbler is abundant throughout the West. I first ob- 

 served it in New Mexico, thence through the ranges of the Rocky Mountains 

 to California, where, particularly during winter, the young birds are found 

 in large flocks, and generally in the tops of trees. Its habits as well as 



