° 1918 ] Oberholser, Races of Toxostoma redivivum. 57 



122-140 (132.7); exposed culmen, 32-39.5 (36.2); tarsus, 37-41.5 (39.1); 

 middle toe without claw, 23.5-26.5 (25.0). 



Female: 1 wing, 97-103.5 (average, 100) mm.; tail, 125-136 (131.9); 

 exposed culmen, 34-37 (35.2); tarsus, 36-40 (38.1); middle toe without 

 claw, 24-26.5 (25.5). 



Type locality. — One mile west of Guerneville, Sonoma County, Cali- 

 fornia. 



Geographic distribution. — Northern and central western California. 

 Resident in the Upper Austral Zone and to a slight extent in the Lower 

 Austral Zone, north to Baird (Shasta County), Stillwater (Shasta County), 

 and Covelo (Mendocino County); west to Olinda (Shasta County), Cahto 

 (Mendocino County); Ukiah (Mendocino County); Guerneville (Sonoma 

 County), Freestone (Sonoma County), Marin County, San Francisco, 

 Pescadero, and Santa Cruz; south to Santa Cruz, and in the Sacramento 

 Valley to Marysville Buttes (Sutter County) and Folsom (Sacramento 

 County); east to Los Gatos, San Jose, Berryessa, Santa Clara, Berkeley, 

 Vacaville (Solano County), Rumsey (northwestern Yolo County), Placer- 

 ville (Eldorado County), Wheatland (Yuba County), Nevada County, 

 and Tehama. 



Remarks. — As are all the forms of the species, the present one 

 is subject to much individual variation, and the characters that 

 separate it from Toxostoma redivivum redivivum and Toxostoma 

 redivivum helvum are, strictly speaking, only average, although it 

 is a race well worthy of recognition. This individual variation 

 shows mostly on the jugulum, abdomen, and upper parts-. Very 

 badly worn specimens are sometimes difficult to distinguish from 

 birds of the other races in similar condition. An example from 

 Folsom, Sacramento County, (No. 82575, U. S. Nat. Mus.) is 

 in perfect, fresh, fall plumage, and shows not the slightest indication 

 of intergradation with Toxostoma redivivum redivivum. 



The thrashers of this species occupying the upper Sacramento 

 Valley and that part of the coast region lying north of San Francisco 

 Bay have been recently separated by Dr. Joseph Grinnell 2 as a 

 subspecies distinct from those inhabiting the coast region from 

 San Francisco Bay south to Monterey Bay, which, as above noted, 

 he considers true Toxostoma redivivum redivivum. With the type 

 series of this additional northern race in hand, together with a 



1 Seven specimens, from California. 



2 Toxostoma redivivum sonomse Grinnell, Pacific Coast Avifauna, No. 11, October 21, 1915, 

 p. 155 (one mile west of Guerneville, Sonoma County, California). 



