188 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



KEY TO THE SPECIES AND SUBSPECIES OF PASSERCULUS. 



a. Upper parts conspicuously streaked, both on pileum and back; primaries exceed- 

 ing tertials by less than length of exposed culmen. 

 6. General color of upper parts gray or grayish brown; paler median crown-stripe 

 distinct, and back with very distinct whitish or pale buffy streaks; paler 

 supra-auricular stripe very distinct; under parts less heavily streaked; feet 

 pale yellowish brown (pale pinkish or straw-colored in life), 

 c. Larger (wing averaging more than 76.20); wing more than seven times as 

 long as exposed culmen; general color above pale brownish gray. (Atlantic 

 coast of United States, New Brunswick, and Nova Scotia, breeding o^ 



islands off the last. ) Passerculus princeps (p. 189) 



cc. Smaller (wing averaging less than 76.20) ; wing less than seven times as long 

 as exposed culmen; general color of upper parts deeper brownish gray or 

 grayish brown. ( Passerculus sandimchenms. ) 

 d. Larger (wing averaging 75.95, tail 51.82, exposed culmen 11.94, tarsus 

 22.35). (Unalaskaand Shumagin Islands in summer; southward along 

 Pacific coast in winter. ) . .Passerculus sandwiohensis sandwiohensiB (p. 190) 

 dd. Smaller (average measurements much less than the preceding). 

 e. Paler and grayer; wing averaging more than 68.58, tail more than 49.53. 

 ( Western North America, from southern Mexico to Alaska. ) 



Passerculus saudwichensis alaudiuus (p. 194) 



ee. Darker and browner; wing averaging less than 68.58, tail less than 49.53. 



/. Larger and not so dark, but averaging darker than the two preceding 



forms; bill stouter; wing averaging 67. 82, tail 48.26, depth of bill at 



base 6.86, tarsus 20.83. (Eastern North America.) 



Passerculus Baudwicliensis savanna (p. 192) 

 ff. Smaller and darker, with more slender bill; wing averaging 66.04, tail 

 46.99, depth of bill at base 6.10, tarsus 20.07. (Coast of central Cali- 

 fornia in summer; southward to central Mexico in winter.) 



Passerculus sandwicheusis bryanti (p. 197) 



56. General color of upper parts grayish olive or olivaceous hair brown; paler 



median crown-stripe indistinct, and back without whitish or pale buffy 



streaks; paler supra-auricular stripe indistinct; under parts more heavily 



streaked; feet grayish brown or horn color. (Coast of southern California.) 



Passerculus beldingi (p. 198) 



aa. Upper parts not conspicuously streaked, except, sometimes, on back; primaries 



exceeding tertials by less than length of exposed culmen. [Passerculus rostratus.) 



h. Wing averaging more than 68.58; coloration lighter and browner. 



t. Larger (except bill) and browner; wing averaging 69.60, tail 52.07, exposed 



culmen 12.45, depth of bill at base 7.37, tarsus 22.61. (Coast of southern 



California; Lower California in winter. ) 



Passerculus rostratus rostratus (p. 199) 



cc. Smaller (except bill) and grayer; wing averaging 68.83, tail 49.78, exposed 



culmen 12.45, depth of bill at base 7.37, tarsus 21.84. (San Benito Island, 



Lower California. ) Passerculus rostratus sanctorum (p. 200) 



hh. Wing averaging less than 68.58 ; coloration darker and grayer or more olivaceous, 

 c. Larger and darker; upper parts more decidedly olivaceous, streaks on chest, 

 etc., blacker; wing averaging 66.80, tail 48.77, exposed culmen 12.95, depth 

 of bill at base 6.60, tarsus 21.34. (Abreojos Point, Lower California.) 



Passerculus rostratus halophilus (p. 202) 

 cc. Smaller and paler; upper parts grayer; streaks on chest, etc. , not so decidedly 

 l)lack; wing averaging 64.01, tail 47.50, exposed culmen 11.18, depth of bill 

 at base 5.84, tarsus 20.83. (Southern extremity of Lower California. ) 



Passerculus rostratus guttatus p. 201) 



