BELDING'S PENINSULAR YELLOWTHROAT 583 



with reddish brown, the throat and breast with brownish saffron, the 

 flanks and sides, as well as the anal region, with cinnamon." 



The series indicates that the spring plumage is acquired mainly, 

 if not wholly, by wear in both young and old birds; and there is 

 probably a complete postnuptial molt in late summer. He describes 

 the adult male in fall as "differing from the spring male in having 

 the yellow of the crown paler and tinged with grayish white; the 

 upper parts of a deeper, browner olive, tinged slightly on the occiput 

 and nape with purplish brown; the yellow of the under parts richer 

 with more decided brownish on the sides and flanks; the base of the 

 lower mandible flesh colored; the remainder of the bill dark horn 

 colored instead of black. The black mask is wholly unmixed with 

 any lighter color." The adult female in autumn differs "from the 

 spring female only in being slightly grayer above." 



Voice. — Bryant (1890) writes: "I frequently heard them sing- 

 ing, sometimes in the top of a low tree. Their notes are rather loud 

 and quite clear, an interval of a few seconds occurring between each 

 song. The three songs which I heard sung by the same individual 

 March 31, were noted on the spot. In different places of the song oc- 

 curred a low, short buzz, represented by stars in the following. The 

 first song occupied about five seconds. 



1. /Sweet, sweet * * * ear * * * sweet, sweet ear * * * 



sweet, sweet ear. 



2. Sweet, sweet ear * * * sweet, sweet ear. 



3. Sweet, sweet ear * * * sweet, sweet ear * * *." 



According to Brewster (1902), Frazar told him that "the song re- 

 sembles that of the Maryland Yellow-throat, but is so much heavier 

 and fuller that it can be easily recognized." Brewster says further 

 that the bird occasionally mounts into the air and sings on the wing. 



DISTRIBUTION 



Range. — Resident in the southern half of Baja California. 



Breeding range. — The peninsular yellowthroat is resident in Baja 

 California from San Ignacio south to San Jose del Cabo. Two sub- 

 species are recognized; Belding's peninsular yellowthroat {G. h. held- 

 ingi) is found only in the extreme southern part of the peninsula 

 (Todos Santos, Triunfo, Santiago, Miraflores, and San Jose del Cabo) ; 

 Goldman's peninsular yellowthroat {G. h. goldmani) occupies a range 

 in central Baja California (San Ignacio, Santa Igueda, San Joaquin, 

 Purissima, and Comondu). 



Egg dates. — Baja California: 9 records, March 25 to May 17; 4 

 records. May 2 to 9. 



Mexico : 6 records, April 9 to June 1 ; 3 records, May 4 to 18, indicat- 

 ing the height of the season (Harris). 



