188 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



KEY TO THE SPECIES AND SfBSPECIES OF PASSERCULUS. 



a. Upper parts conspicuously streaked, both on pileum and l^ack; ]n'iniaries exceed- 

 ing tertials by less than length of exposed culmen. 

 b. 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 l)rown (pale pinkish or straw-colored in life). 

 r. 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 on 



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 

 rrrayish brown. [Passerculus^ sanduichensis. ) 

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

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

 Pacific coast in winter. ) . .Passerculus sandwichensis sandwichensis (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 sandwichensis alaudinus (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 sandwichensis 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 sandwichensis bryanti (p. 197) 



hh. 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. 



c. 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 

 black; 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) 



