BIRDS OF NORTH AND MIDDLE AMERICA. 235 



'■ ^°';j!'f -^^ ']f'^\^ with white of orbital ring, etc., purer; bill 

 thicker. ( Southern portion of Lower California. ) 



. -A. imophila ruficeps sororia ( p -MS) 



gg. Larger (wnig averaging more than 60.96, tail averaging more' than 

 bb.oOj. 



h. Larger (wing averaging 66.04, tail averaging 69.34); coloration 

 paler, with more gray above. (Arizona to western Texas 

 Chihuahua and Sonora. ) Aimophila ruficeps scottii (p. 248) 



?K i'r.? "T^^^"^ ''''' "^^-"^^ than 6.3.50, tail averaging less 

 than 66.04); coloration darker, with less grav above 

 I. Paler, more rusty. (State of Oaxaca, southern Mexico.) 

 .. Aimophila ruficeps australis (p -^50) 



n. Darker, more fuscous. (States of Guerrero, Michoacan, and 

 J^ii^co, southwestern Mexico. ) .Aimophila ruficeps fusca ( p. -^m 

 ff. General aspect of upper parts grayish, the back with narrow brown 

 streaks, often with blackish shaft-lines. 

 g. Darker (hair brown above), with streaks on back much darker 

 (Southeastern portion of Mexican plateau.) 

 ^ . ^ , Aimophila ruficeps boucardi (p. 252^ 



gg. Paler (ash gray above) , with streaks on back paler. (Texas Xuevo 



W^ P-I K ' ^^"'^^l^P^^*^' etc.) Aimophila ruficeps eremoeca (p. 251) 



dd. PUeum brown or chestnut, streaked with grayish or dull Imffv; edge o 

 wing pale yellow. • ^ 



e. Scapulars and interscapulars with subterminal transverse spots, blotches, 

 or bars of blackish, but without mesial streaks of the same; outer webs 

 o secondaries and proximal greater coverts pale grayish brown or 

 drab (Texa^to Kansas, Arizona, and Sonora. ) . Aimophila cassinii (p. 253) 

 ee. Scapulars and interscapulars streaked, but not subterminallv spotted or 

 barred, with blackish; outer webs of secondaries and proximal greater 

 coverts more or less rufescent. 

 /. Outermost (ninth) primary longer than third; coloration paler 

 9. \Ving averaging less than 60.96, tail averaging less than 64.77, tarsus 

 averagmg less than 20.32; chestnut-brown or rustv postocular streak 

 very distinct. 



h. Grayer above, with the chestnut streaks darker, the back always 

 and pileum u.snally streaked with black; chest, etc., more gravish 

 (Lower Georgia to Florida. ) " ' ' 



,, ,, Aimophila aestivalis agstivalis (p. 254) 



hh. More rusty above, with chestnut streaks lighter, more rufescent 



only the back and scapulars with black streaks, these narrower' 



sometimes wanting; chest, etc., more buffy. (South Carolina 



to V irginia, Indiana, Illinois, Texas, etc. ) 



^„ TTr. . -Aimopliila aestivalis bachmanii (p. 256) 



gg. Wing averaging more than 63.50, tail averaging more than 66 04 



tarsus averaging more than 20.32, or else plumage very dark 



above, with black or dusky prevailing; brown or duskv postocular 



streak indistinct. (Southern Mexico to .southern Texas and Ari- 



j^f r>„. '/ y '"■,': Aimophila botterii botterii (p.257) 



//. Outermost (ninth) primary not longer tlian third; coloration darker 

 (otherwise like A. b. botterii, but much smaller) 

 g. Larger (adult female with wing 56.64-59.69, tail 54.10-57.91) • wine- 

 coverts less brown. (East slope of Vera Cruz to Chiapas; northern 



„„ Q n"^^^"^,' V '• Aimophila botterii sartorii (p. 259) 



gg. Smaller (adult temale with wing 55.88, tail 53.34) ; wing-coverts more 

 brown. (Northeastern Guatemala. ) 



Aimophila botterii petenica (p. 260) 



