BREWSTER : BIRDS OF THE CAPE REGION, LOWER CALIFORNIA. 183 



Dendroira auduhoni Bryant, Proc. Calif. Acad. Sci., 2d ser., II. 1889, 309 (Victoria 

 Mts. ; Cape Region). 



Young females of this species in autumn plumage not infrequently lack all 

 traces of yellow on the throat. In this condition, which is represented by 

 several birds in Mr. Frazav's collection, they are not easily distinguishable 

 from the young of coromita, although their upper parts are usually somewhat 

 more ashy in tone, and their wings and tails longer. Even in these respects 

 the two species occasionally resemble one another so closely as to render their 

 discrimination a matter of no slight difficulty. 



Audul)on's Warbler appears to find only a winter home in the Cape Region, 

 which it reaches rather late in autumn, judging by the experience of Mr. Frazar 

 who first observed it at that season on November 9 at San Jos6 del Cabo, 

 Later he found it common and universally distributed over the entire country, 

 not less abundantly, indeed, on the summit of the Sierra de la Laguna than 

 thnuighout the lowlands bordering the coast. At La Paz the last stragglers 

 left for the north before the end of the first week of March. 



Mr. Bryant records Audubon's Warbler from several places in the upper 

 portions of the Peninsula, and Mr. Anthony reports that it is " very abundant 

 during migrations " about San Pedro Martir, where, however, it is not known 

 to breed, even on the summit of the elevated plateau.^ It is resident in 

 California, breeding in the mountains as far south as San Bernardino county, 

 and also ranging in summer into British Columbia, but not, apparently, to 

 Alaska, where it is replaced by D. coronata. Its southward migration extends 

 to Guatemala. 



Dendroica nigrescens (Towns.). 

 Black-throated Gray Warbler. 



Dendroeca nigrescens Belding, Proc. U. S Nat. Mus., VI., 1883, 347 (Victoria 



Mts.)." 

 Dendroica nigrescens Bryant, Proc. Calif. Acad. Sci., 2d ser., II. 1889, 309 (Victoria 



Mts.). 



This is another winter resident, less numerous and widely distributed than 

 D. auduhoni, but by no means uncommon in places suited to its tastes. Mr. 

 Belding seems to have found it only on the mountains "above 3,000 feet alti- 

 tude " and " in mountain canons of about 1,000 feet altitude." Mr. Frazar's 

 experience was essentially similar, although he took one specimen (perhaps a 

 mi.rrant) at La Paz on March 30. The species was rare at Triunfo in April, 

 but common on the Sierra de la Laguna in the latter part of November, and 

 at San Jose del Rancho in December. All of the ten specimens taken in au- 

 tumn appear to be old birds. Mr. Frazar's latest spring date is April 27, when 

 a female was shot on La Laguna. 



I Zee, IV. 1893, 244. 



