BIRDS OF NORTH AND MIDDLE AMEBIC A. 267 



Adult mafe.— Length (skins), 125.73-133.35 (130.30); wing, 66.80- 

 69.09 (67.82); tail, 63.50-68.33 (65.02); exposed culmen, 8.89-10.16 

 (9.65); depth of bill at base, 5.59-6.35 (6.10); tarsus, 17.78-19.81 

 (18.80); middle toe, 12.70-13.21 (12.95); white spot on outermost tail- 

 feather, 7.62-12.19 (8.38).' 



Adult female.— Length, (skins), 127.00-132.08 (130.30); wing, 65.63- 

 66.80 (66.04); tail, 64.01; exposed culmen, 9.91-10.16 (10.16); depth 

 of bill at base, 5.59; tarsus, 18.80-19.66 (19.30); middle toe, 12.45- 

 13.46 (12.70); white spot on outermost tail-feather, 5.08-8.13 (6.60).^ 



Central portion of Mexican plateau, in States of San Luis Potosi 

 (Ahualulco, Hacienda La Parada), Hidalgo (Tula), Durango (Ciudad 

 Durango), etc. 



(?) Poospiza bilineata (not of Sclater, 1850) Sclater, Cat. Am. Birds, 1862, 110 



(Mexico). 

 [Poospiza] bilineata Sclater and Salvin, Nom. Av. Neotr., 1873, 30, part (Mexico). 

 Amphispiza bilineata grisea Nelson, Proc. Biol. Soc. Wash., xii. Mar. 24, 1898, 61 



(Tula, Hidalgo, Mexico; U.S. Nat.Mus.). 



AMPHISPIZA BELLI BELLI (Cassin). 

 BELL'S SPARROW. 



Adults {sexes alike). — Above (including auricular region and sides of 

 neck) deep brownish slate-gray, becoming browner on back, where, as 

 well as on pileum, sometimes narrowly streaked with blackish or dusky; 

 wings and tail dull blackish, with light brown edgings (pale grayish 

 on primaries), the middle and greater coverts indistinctly tipped with 

 pale brownish buffy or pale wood brown ; supraloral spot (sometimes 

 also a small narrow streak in middle of forehead), orbital ring, malar 

 stripe, and under parts in general white; lores, broad stripe on sides 

 of throat and foreneck, and spot in middle of chest, black or dusky 

 grayish; sides and flanks more or less tinged with buflEy and streaked 

 with dusky; edge of wing pale yellow or yellowish white; maxilla 

 blackish, mandible pale grayish blue (in life); iris brown; tarsi deep 

 horn brown, toes usually darker. 



Young. — Pileum and hindneck dull gray, the former broadly streaked 

 with black; back and scapulars grayish brown (between broccoli and 

 hair brown), broadly streaked with black; under parts pale j'ellowish 

 buff, the chest and sides of throat broadly streaked with blackish, 

 the breast, sides, and flanks with smaller streaks of the same; a buffy 

 whitish orbital ring; wings and tail much as in adults, but the epgings 

 browner, and greater wing-coverts tipped with dull buffy. 



Adult male.— Length, (skins), 124.46-144.78 (137.16); wing, 58.93- 

 70.87 (66.80); tail, 68.93-72.90 (66.29); exposed culmen, 8.13-10.41 



^Five specimens. ''Three specimens. 



