SMALL TITRUSIIES OF CALIFORNIA. 



61 



mens in the mountains of Calaveras County, and these were 

 compared witli skins of T. n. swai)isonii in the Smithsonian, 

 and identified as typical T. v. sfrai}iso)}ii by Dr. A. K. 

 Fisher. Prof. Ridgway also thinks them T. u. sioainsomi , 

 and my specimens collected in Calaveras and Tuolumne 

 Counties in May and June, 1889, fully confirm the opinions 

 of these gentlemen, as I find no difference between them 

 and types of T. ti. sunnvsonii from the Atlantic Coast, which 

 were kindl}^ selected and sent me by Prof. Eidgway and Mr. 

 Brewster. I have a specimen I shot in Sierra Valley, Cali- 

 fornia, on the east slope of the Sierra, June 20, 1885, which 

 I think belongs liere. I think this form is common in 

 the Sierra Nevada mountains of California in summer, as 

 I have heard its song in Tuolumne, Calaveras, Placer, Butte 

 and Sierra Counties — a song which resembles the song of 

 T. vsfulatiis, but lacks its power, sweetness, and ringing- 

 tones. The call and alarm notes of both forms are, how- 

 ever, almost identical. 



The note of alarm of tlie California T. ?/. sivainsonii is a 

 short, soft, musical whistle, wliich may be .represeuted by 

 the word " ichoety The call is also a whistling note, higher 

 than the note of alarm, lasts two or three seconds and is 

 suggestive of the peep of our small hog Hyla regiUa . It 

 has an enquiring expression. I think it louder than the 

 call of T. itstidatus. 



Examples of songs of Swainson's Thrash, which I copied 

 as uttered in Calaveras County, California: 



All of the notes excepting the one or two introductory 

 ones of the soncs are confluent or slurred. 



