284 Univi rsity of California Publications in Zoology [Vol. 10 



variously advanced in the post-juvenal molt. An immature 

 female secured August 2 (no. 2873) has already acquired com- 

 plete first winter plumage. 



Thirty-five specimens were collected: Cabezon, one (no. 

 1625). Puller's Mill, three (nos. 1898 1900), San Jacinto Peak. 



(in.' i no. 2093), Round Valley, fiv. >s. 2<>!i4. 2095, 2208-2210), 



Tahquitz Valley, twenty-three (nos. 2873, 2S74. 2895-2915), 

 Strawberry Valley, two (nos. 2643, 2644 . 



Zamelodia melanocephala capitalis (Baird) 

 Pacific Black-headed Grosbeak 



A common species, excepl in the highest parts of the range. 

 At Cabezon tiny were abundanl early in May, but apparently 

 did no1 remain to breed in this region, for by the end of the 

 month the birds had nearly all departed. They were fairly com- 

 mon at Schain's Ranch and Fuller's .Mill. In Strawberry Valley 

 during July they were numerous. A few were seen in Tahquitz 

 Valley, wanderers from lower zones, as were probably others 

 observed on Santa Rosa Peak. Several seen on Thomas Moun- 

 tain, An-iist Pi to 21. 



Twenty-six specimens secured: Cabezon, four (nos. ltd:'. 

 1616); Schain's Ranch, seven DOS. 1792 1798 ; Poppet Plat, 

 one (no. 1889 : Banning, one (no. 2031 ; Snow Creek, two nos. 

 2060, 2061) ; Santa Rosa Peak, one (no. 2476 ; Strawberry Val- 

 ley, six (nos. 2607 2612 ; Tahquitz Valley, one (no. 2850); 

 Ilemet Lake, three I nos. 2980 2982). 



Comparison of California specimens of the black-headed gros- 

 beak with a satisfactory series of breeding birds from south- 

 eastern Arizona, reveals differences justifying the separate nam- 

 ing of the two races. The California birds, compared with true 

 melanocephala of the Rocky Mountain region, have uniformly 

 shorter win- length, smaller bills, and the black of the bend 

 invariably interrupted by a more or Pss distinct post-ocular 

 stripe. The presence of these differences is. of course, no new 

 discovery (see Kid-way. 1901, bis. 619; Grinnell, 1900, 128), 

 Imt though hum' acknowledged to exist. Hie two forms have not 



