284 Univt 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: Caliezon, one (no. 

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

 one (no. 2093). Round Valley, five (nos. 2094, 2095, 2208-2210), 

 Tahquitz Valley, twenty-three (nos. 2873. 2874, 2895-2915). 

 Strawberry Valley, two (nos. 2643. 2644). 



Zamelodia melanocephala capitalis (Baird) 

 Pacific Black-headed Grosbeak 



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

 At Cabezon they were abundant early in May. but apparently 

 did not 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 cm Santa Rosa Peak. Several seen on Thomas Moun- 

 tain, August 16 to 21. 



Twenty-six specimens secured: Cabezon, four (nos. 1613- 

 1616); Schain's Ranch, seven (nos. 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) ; 

 Hemet Lake, three (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 wing length, smaller bills, and the black of the head 

 invariably interrupted by a more or less distinct post-ocular 

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

 discovery (see Riclgway, 1901, 618, 619; Grinnell, 1900, 128), 

 but though long acknowledged to exist, the two forms have not 



