BREWSTER: BIRDS OF THE CAPE REGION, LOWER CALIFORNIA. 1S7 



individuals, and there is often a trace of cinnamon on the flanks as well as, 

 sometimes, on the breast. There is no ditHculty whatever in separating 

 arizela, in any of the plumages just described, from its eastern representative, 

 trichas, the two appearing to differ quite as markedly in their immature or 

 autumnal conditions as in full spring dress. I have not been able to make a 

 satisfactory comparison of the autumnal or winter plumages of arizda with 

 those of occidoitalis, but breeding birds of these Ibrms may be easily distin- 

 guished by the characters to which Mr. Oberholser has called attention. 



Mr. Frazar found this Yellow-throat in March at La Paz, where it was rare; 

 in autumn at San Jose del Cabo, where it was exceedingly abundant ; and at 

 San Jose del Eancho (the only place not directly on the coast), where two 

 specimens were obtained on December 22. At San Josd del Cabo it was 

 present in small numbers at the date of Mr. Frazar's arrival, August 23, but it 

 did not attain its maximum abundance until about the middle of September, 

 after which its numbers steadily but gradually diminished, although it re- 

 mained common throughout October, and indeed up to the time of Mr. 

 Frazar's departure, November 13. It probably winters in the Cape Region, 

 but there is no present evidence to show that it ever breeds there. 



Throughout the central jjortions of the Peninsula Mr. Bryant has met with 

 only a single specimen — on Santa Margarita Island. Mr. Anthony, however, 

 found what was probably this subspecies, common " in swamps along the north- 

 west coast " (Bryant), and a few were heard by him in the tules bordering a 

 water hole at San Fernando while they were " not uncommon about the base " 

 of San Pedro Martir in late April and early Ma3\^ 



I have typical examples of arizela taken in winter and early spring at 

 Guaynias and Oposura in northwestern Mexico. According to Mr. Grinnell,^ 

 this form " occurs abundantly in parts of California during the spring and fall 

 migrations," and is found in the breeding season "on the Pacific slope from 

 Central California to British Columbia," while a larger race — scirpicola — is 

 " permanently resident in the fresh-water tule beds of the southern coast dis- 

 trict," and a smaller one — sinuosa — similarly restricted at all seasons to the 

 " salt marshes of San Francisco Bay and vicinity." 



Of the value and constancy of the characters which are thought by Mr. 

 Grinnell to distinguish scirpicola and sinuosa from each other — and from 

 arizela — I have no present means of judging, but arizela is unquestionably a 

 good subspecies. 



Geothlypis beldingi Ridgw. 



Belding's Yellow-throat. 



Geothlypis beldingi Ridgwat, Proc. U. S. Nat. Mus., V. 1882, 344, 345 (orig. descr. ; 

 types from San Jose' del Cabo) ; VI. 1883, 158, footnote (crit. ; S. Lower 

 Calif.) Belding, Ibid., V. 1883, 546 (San Jose' ; Miraflores ; canons of the 



1 Auk, XII. 1895, 142 ; Zoe, IV. 1893, 245. 2 Condor, III. 1901, 65. 



