1920] 



Swarth: Revision of Avian Genus Passerellu 



135 



consequent superficial resemblance to insul-aris, to their iliaca strain, 

 but this is a point that can hardly be determined from winter birds 

 alone. 



Passerella iliaca sinuosa Grinnell 

 Valdez Fox Sparrow 

 Original description. — Passerell-a iliaca sinuosa Grinnell, 1910, p. 405. 



Type specimen. — No. 1593, Calif. Mus. Vert. Zool. ; male adult ; 

 Drier Bay, Knigrht Island, Prince William Sound, Alaska ; August 26, 

 1908; collected by J. Dixon; original number 309. 



Fig. S. Bills of three subspecies of fox sparrow of the Unalaschcensis group; 

 natural size. 



a. Passerella iliaca insularis, adult male; no. 9655, Mus. Vert. Zool.; Kuiu 

 Island, Alaska; April 30, 1909. 



b. Passerella iliaca sinuosa, adult male; no. 1591. Mus. Vert. ZooL; Hawkins 

 Island, Prince William Sound, Alaska; June 22, 1908. 



c. Passerella iliaca annectens, adult male; no. 7198, Mus. Vert. Zool.; Xicasio, 

 Marin County, California; February 21, 1909. 



Range. — In simimer the Prince William Sound region (both on 

 the islands and the mainland), Middleton Island, and the Kenai 

 Peninsula, Alaska. In winter south on the Pacific slope at least as 

 far as southern California. In its migrations and winter habitat 

 sinuosa for the most part avoids the immediate vicinit}' of the coast. 

 The main winter habitat appears to be the eastern part of the San 

 Diegan region, southern California, but a certain percentage of the 

 birds winters in the foothills along the west slope of the Sierra Nevada, 

 and small numbers even as far north as central Oregon. 



Specimens examined. — 365 (see list, pp. 189-194). 



Distinguishing characters. — Of the Unalaschcensis group (see p. 

 89). Bill rather long and slender, not as heavy as in iinalaschcensis 

 and insularis, but larger than in the more stubby-billed annectens, 

 townsendi, and fuliginosa (see fig. S). Coloration rather more reddish 

 than in unalaschcensis, but decidedly less so than in the brighter 

 colored insularis, and the darker annectens and tmvnsendi. A notice- 

 ably ashy tinge dorsally and on sides of neck. 



RemarJiS. — The summer habitat of sinuosa lies between the ranges 

 of unalaschcensis and annectens, and, in physical characters also, 



