CALAVERAS WAKBLEE. 39 



at Petersburg-, Mich., Ma}^ T; in southern Ontario, May 6, and at 

 Ottawa, May 14. Similar records west of the Mississippi are: Keokuk, 

 Iowa, Ma}' 6; Grinnell, Iowa, Ma}' 5; Lanesboro, Minn., May 9, and 

 Minneapolis, May l-i. The Nashville warbler enters southern Texas 

 the last of March; it was noted near Hidalgo, March 15, 1880, and at 

 San Antonio, March 30, ISSO, March 21, 1889, March 27, 1890, and 

 March 27, 1891. These dates compared with those of earliest arrival 

 at St. Louis indicate a fair rate of speed, 27 miles per day, between 

 Texas and St. Louis. But on the assumption that the breeding- 

 birds of Massachusetts also enter Texas the last of March, their 

 average daily speed must be nearly twice as great as that of the St. 

 Louis birds. Many more data on the movements of this species are 

 required before the routes of migration can be determined with satis- 

 factory exactness. In spring migration the bird has been seen at San 

 Antonio, Tex., as late as May 12, 1891. The last northward migrants 

 leave St. Louis about May 20. 



JFall inigration. — The earliest migrating Nashville warblers are 

 scarcely seen south of their breeding grounds before the middle of 

 August. First migrants have been noted at Chicago, August 16, 

 1896; Beaver, Pa., September 5, 1903; Ossining, N. Y., August 11; 

 Englewood, N. J., August 26, 1887; Washington, September 5; 

 Frenchcreek, W. Va., September 7, 1890; St. Louis, September 17, 

 1885, and Gainesville, Tex., October 11, 1885. The average date of 

 the last seen at Lanesboro, Minn., is September 27; at Ottawa, Sep- 

 tember 20; at St. John, New Brunswick, September 2; in southern 

 ]Maine, September 11, and at Renovo, Pa., September 26. 



645 a. Helmintliopliila rubricapilla gutturalis (Ridgw.). Calaveras Warbler. 



The Calaveras warbler inhabits the Pacific slope, breeding from 

 central California north to British Columbia and east to the Rocky 

 Mountains. Its migration is a simple movement south and southeast 

 by land to Mexico. The parties of the Biological Survey found this 

 western form common during the winter at sea level in Colima and 

 Guerrero, at 7,000 feet in the mountains of flalisco, and at elevations 

 ranging to 8,000 feet in the mountains about the valley of Mexico. 

 The southernmost point from which it is recorded is Sta. Eiigenia, 

 Oaxaca, where it was taken by Sumichrast December 24, 1868. A few 

 individuals may occasionally winter in southern California, as the spe- 

 cies was seen February 3 and 9, 1895, at San Bernardino. The arrival 

 of the first in spring was noted at Yuma, Ariz., March 11, 1902; Twin 

 Oaks, Cal., March 24, 1889; Huachuca Mountains, Arizona, April 1, 

 1902; Dunlap, Cal., April 23, 1891, and Revelstoke, B. C, May 9, 1890. 

 The last was seen in fall at Dunlap, October 12, 1890, and at Cooney, 

 N. Mex., September 30, 1889. 



