April, 1919] Subspecies of Passerculus Rostratus 349 



Lower California. — San Cristobal Bay (March IG, 1884) ; 

 Montague Island (May 16, 1915); Cape San Lucas (Sept. 

 8 and 29, 1859, Sept. 22, 1859, Oct. 24, 1859, Sept. 25 and 27, 

 1859, Nov. 12 and 25, 1859); Todos Santos (March 13, 1883); 

 Todos Santos Island, La Paz (Feb. 6 and 12, 1882, Jan. 2 and 11, 

 1882, Dec. — , 1882, Dec. 15, 1881, Jan. 11, 1888, Feb. 7 and 14, 

 1887); Santo Domingo (Sept. 26 and 27, 1905); San Quintin 

 (Aug. 31, 1905); San Jose del Cabo (Jan. 8 and 9, 1906, Oct. 

 3, 10, 13, and 18, 1887, Sept. 1, 5, 14, 17, 20, 21, 27, and 29, 

 1887, Aug. 31, 1887, Nov. 4 and 9, 1887); San Lucas, north of 

 Comondu (Oct. 26, 1905) ; Socorro, 15 miles south of San 

 Quintin (Sept. 1, 1905); Magdelena Island (Nov. 24, 1905); 

 Santa Rosalia Bay, lat. 29° (Aug. 16, 1896) ; Playa Maria, lat. 

 29° (Aug. 25, 1896) ; Carmen Island (March 2, 6, and 7, 1887) ; 

 San Rogue (March 15, 1911) ; Mangrove Island (Mar. 20, 1911); 

 San Bartolome Bay (Mar. 13 and 14, 1911); Magdalena Town 

 (Mar. 20, 1911) ; Abreojos Point (Mar. 16, 1911); Tiburon 

 Island (April 12, 1911). 



Sonora. — Colorado River, opposite mouth of Hardy River 

 (Mar. 25 and 26, 1894); Mouth of Colorado River (Oct. 11, 



); Guaymas (Feb. 22, 1904, Dec. 9, 1882, Jan. 14 and 18, 



1887). 



Passerculus rostratus guttatus Lawrence. 



Passerculus guttatus Lawrence, Ann. Lye. Nat. Hist. N. Y., VIH, Nos. 15-17, 

 May, 1867, p. 473 (San Jose del Cabo, Lower California). 



Passerculus sanctorum Ridgway, Proc. U. S. Nat. Mus., V, April 3, 1883, p. 

 538 (ex Coues MS.) (San Benito Island, Lower California). 



Chars, subsp. — Similar to Passerculus rostratus rostratus, but some- 

 what smaller, with a slenderer bill, the colors above darker, more 

 grayish (less rufescent) and streaks on lower parts deeper, more blackish. 



Measurements. — Male:* wing, G3-73.7 (average, 68.4) mm; tail, 

 47-53.5 (50.4); exposed culmen, 11.2-12.7 (11.5); height of bill at 

 base, 5.6-8.1 ((i.S); tarsus, 20.6-22.9 (21.8); middle toe without claw, 

 15-18 (16.3). 



Female :t wing, 62-68.3 (average, 65.8) mm.; tail, 46.5-53 (49.5); 

 exposed culmen, 11.7-13 (12.3); height of bill at base, 6-7.4 {Q.iS)\ 

 tarsus, 19.2-22.5 (21); middle toe without claw, 15-16.5 (16). 



Type locality. — San Jose del Cabo, Lower California. 



Geographic distrihutiori. — Coastal region of Lower California 

 and southwestern California. Breeds on the San Benito 



* Ten specimens, from Lower California. 

 t Ten specimens, from Lower California. 



