BIBDS OF KOETH ANi) MIDDLE AMERICA. 555 



Om. Club, viii, 1883, 187 (Fort Wallace, w. Kansas, 2 specs.. May 27); Auk, 

 i, 1884, 100 (Wallace, w. Kansas, several in Oct.). — Shahpe, Cat. Birds Brit. 

 Mus., X, 1885, 315, 650 (La Parada, Oaxaca; Ciudad Durango; Presidio, 

 near Mazatlan; Totonicapam and San Geronimo, Guatemala, etc.). 



[Dendroeca] auduboni Sclater and Salvin, Norn. Av. Neotr., 1873, 9. 



D[endrceca] auduboni Coues, Key N. Am. Birds, 2d ed., 1884, 302. 



Dendroeca audubonii Coues, Proc. Ac. Nat. Sci. Phila., xv, 1866, 69 (Fort Whip- 

 ple, Arizona); Birds N. W., 1874, 58.— Cooper, Orn. Cal., 1870, 88.— Ribg- 

 WAY, Nom. N. Am. Birds, 1881, no. 96. 



[Dendrceca] audubonii Coues, Key N. Am. Birds, 1872, 100. 



Dendrceca audubo7iii Sclater, Cat. Am. Birds, 1862, 30 (California; Mexico). 



Dmdroica audubonis Baird, Ives' Rep. Col. R., pt. vi, 1861, 5. 



Dendroeca auduboni Sundevall, Ofv. k. Vet.-Ak. Forh. Stockh., xxvi, 1870, 613 

 (monogr. ). 



Dmdroica coronata . . . var. auduboni Ridgway, Bull. Essex Inst., v, Nov., 1873, 

 180 (Colorado). 



[Dendroica coronata] var. auduboni Baird, Brewer, and Ridgway, Hist. N. Am. 

 Birds, i, 1874, 219. 



(l)Dendrceca coronata (not Motacilla coronata Gmelin?) Brewster, Bull. Nutt. 

 Orn. Club, vii, 1882, 137 (Chiricahua Mts., Arizona, Mar.; crit.). 



DENDROICA AUDUBONI NIGRIFRONSi (Brewster). 

 BLACK-FRONTED ■WARBLER. 



Similar to D. a. av3uhoni, but larger and muck darker in color. 

 Adult male in spring and summer with forehead, sides of crown, and 

 auricular region black, instead of bluish slate-gray; back black, with 

 feathers narrowly margined with bluish gray; foreneck, chest, whole 

 breast (except lower median portion and lateral yellow patches) uniform 

 black. Winter male with less black on upper parts, the forehead 

 merely streaked with black, but differing from the same stage of D. a. 

 audvhoni in having the bluish gray of upper parts very little, if any, 

 stained with brown, and the black of under parts merely broken by 

 rather narrow whitish tips to the feathers. Adult female more heavily 

 streaked with black above on a darker ground color. Young (in first 

 plumage) much more heavily streaked with dusky, both above and 

 below. 



Adult maZe.— Length (skins), 127-141 (137.7); wing, 77.5-84.1 

 (80.5);' tail, 57.9-64.3 (62); exposed culmen, 9.4-9.6 (9.5); tarsus, 

 19-19.6 (19.3); middle toe, 12.4-12.9 (12.7).= 



'A breeding male from mountains near head of Pecos River, New Mexico, is 

 exactly intermediate between D. auduboni and D. nigrifrons, thus proving intergrada- 

 tion between the two forms. 



'Four of the specimens measured are in worn midsummer plumage with tips of 

 primaries abraded; specimens in good plumage would show considerably greater 

 average length of wing. 



'Five specimens. 



