428 NORTH AMERICAN BIRDS. 



Indiana (to at least 40), west to middle northern 



Texas 575. P. aestivalis bachmani (Amx). 



Bachman's Sparrow. 

 e*. Entire lower parts pale dull grayish buff, paler on throat, the 



middle of the belly sometimes nearly white. 

 f 1 . Larger and lighter colored. Adult: Above dull light 

 grayish brown, more or less mixed with rusty, the 

 back, and sometimes top of head, streaked with black. 

 Young: Above dull light grayish buff, everywhere 

 broadly streaked with dusky ; lower parts pale dingy 

 buff, the throat, chest, and sides of breast streaked 

 with dusky ; greater wing-coverts broadly edged with 

 light tawny. Length about 6.00-6.50, wing 2.45 1 -2.75 

 (2.55), tail 2.50 l -2.90 (2.70), culmen .51-.55 (.53), depth 

 of bill at base .25-.2S (.26), tarsus .60-.65 (.62). Eggs 

 .72 X -58, plain pure white. Hob. Northern, central, 

 and western Mexico, south to Guanajuato and Colima, 

 north to southern Arizona and Rio Grande Valley. 



576. -f 577. P. mexicana (LAWR.). 

 Mexican Sparrow. 2 



/*. Smaller and darker colored ; upper parts heavily streaked 

 with blackish on a grayish and rusty ground ; wing 

 2.50-2.55, tail 2.60-2.65. Hab. Southeastern Mexico 

 (Vera Cruz, etc.). 



P. botterii SCL. Botteri's Sparrow. 8 



d*. Middle tail-feathers with decided indications of transverse bars, 

 projected from a dark brown median stripe ; flanks broadly 

 streaked with dark brownish. 



Adult: Above grayish, spotted with clear urnber-brown and 

 dusky, the upper tail-coverts with subterminal transverse, 

 more or less crescentic, spots of dusky ; beneath dull gray- 

 ish white, faintly tinged with brownish on chest and sides ; 

 length 6.00-6.75, wing 2.50-2.70, tail 2.65-2.90, culmen .50- 

 .53, tarsus .77-.S2. Eggs .73 X -56, plain pure white. Hab. 

 Southwestern border of United States (Texas to Arizona) 

 and nerthern Mexico ; north, in summer, to middle Kansas. 

 578. P. cassini (WOODH.). Cassin's Sparrow. 



c*. Edge of wing dull white or grayish. {Adult: Crown chiefly ferru- 

 ginous, often quite uniform ; upper parts grayish or grayish brown, 

 the back and scapulars broadly streaked with rusty or brown ; 



1 The minimum measurements of wing and tail, as given above, are very unsatisfactory, the specimens from 

 which they were taken having the quills and tail-feathers much worn. The true average, therefore, should be 

 considerably higher at least 2.60 for the wing and 2.75 for the tail. 



1 Includes also P. arizonx RIDGW., which proves to be not separable. 



> Zonotrichia botterii SCL., P. Z. S. 1857, 214. Feucxa botterii SCL., Cat. Am. B. 1862, 116. 



