250 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



AIMOPHILA RUFICEPS AUSTRALIS (Nelson). 

 OAXAOA SPAEROW. 



Very similar in coloration to A. r. Ncottii, but decidedly smaller and 

 with shorter and thicker bill. 



Adult mah'.—hangih (skins), 139.70-144.78 (142.24); wing, 63.60- 

 64.01 (63.76); tail, 66.55-68.58 (67.66); exposed culmen, 11.43-12.70 

 (11.94); depth of bill at base, 6.86; tarsus, 20.32; middle toe. 15.24.' 



.ir/;/./^/^;««Zc'.— Length (skins), 134.62-138.43 (136.40); wing, 59.69; 

 tail, 60.4.5-64.77 (62.48); exposed culmen, 11.43-13.97 (12.70); depth 

 of bill at base, 6.35-7.11 (6.73); tarsus, 20.57-20.83 (20.70); middle toe, 

 14.48-16.24 (14.66).' 



Southern extremity of Mexican plateau (up to 6,000 or 7,000 feet in 

 mountains) in State of Oaxaca (city of Oaxaca, near Totolapa). 



Petccsea ruficeps {not Ammodromus riificeps Cassin) Sclatee, Proc. Zool. Soe. Lond., 



1859, 380 (Oaxaca). 

 {Peuacal houcardi (not Zonotricliia houcardi Sclater) Sclater and Salvin, Nom. 



Av.Neotr., 1873, 82, part. 

 Peucsea houcardi Salvin and Godman, Biol. Centr.-Am., Aves, i, 1886, 391, part 



(Oaxaca). 

 {Peuciea mficeps] var. houcardi Ridgway, in Baird, Brewer, and Eidgway's Hist. 



N. Am. Birds, ii, 1874, 38, part (Oaxaca; not description). 

 Peuaca ruficeps houcardi American Ornithologists' Union, Check List, 1886, no. 



580a, part. 

 P. [eucxa] ruficeps houcardi Ridgway, Man. N. Am. Birds, 1887, 429, part (Oaxaca). 

 Feucita ruficeps australis Nelson, Auk, xiv, Jan., 1897, 63 (City of Oaxaca; U.S. 



Nat, Mus.). 



AIMOPHILA RUFICEPS FUSCA (Nelson). 

 ETZATLAN SPARROW. 



Similar to A. r. australis but decidedly darker, the general aspect of 

 upper parts being, in summer plumage, nearly uniform dark rusty 

 brown, with the pileum uniform deep chestnut; in winter plumage 

 the back and scapulars more broadly streaked with chestnut-brown or 

 Vandyke brown on a moi'e olivaceous ground color. 



Adult male.— 'Length, i&kms), 134.62-143.51 (138.18); wing, 61.47- 

 66.04 (64.26); tail, 64.26-68.07 (66.29); exposed culmen, 11.18-13.21 

 (11.68); depth of bill at base, 6.60-7.37 (6.86); tarsus, 19.81-22.36 

 (20.83); middle toe, 13.97-15.49 (14.73).' 



Advlt f&nale.— Length, (skins), 132.08-142.24 (138.18); wing, 58.42- 

 64.77 (61.72); tail, 60.96-66.04 (63.25); exposed culmen, 10.41-12.45 

 (11.68); depth of bill at base, 6.35-7.11 (6.86); tarsus, 19.81-22.10 

 (20.83); middle toe, 13.97-15.24 (14.99).' 



'Two specimens. ^ Seven specimens. " Six specimens. 



