626 KORTH AMERICAN BIRDS. 



men .40, dqjth of bill at base .15-.18, tarsus .85. Hah. Western 

 Mexico (Mazatlan, etc.). 

 (gg \ G. poliocephala Baird. Mazatlan Yellow-throat.' 



c'. Bill larger and stouter ; belly and anal region j-ellow, the sides and 

 tlanks light olive-graj-ish ; adtdt male with toji of head dull brown- 

 ish gray; wing 2.25-2.35, tail 2.50 (or more, the feathers in both 

 specimens being very much worn at tips), exposed eulmen .45-48, 

 depth of bill at base .20-.22, tarsus .88. JIab. Eastern Mexico 

 (Mirador, etc.) and Yucatan (Merida). 



G. palpebralis KiDOW. Mirador Yellow-throat.' 

 t'. Ej-elids entirely black in adult male (brownish or olive in female and 

 young). 



Otherwise like G. palpebralis, but gray of bead much deeper and purer, 

 and extending over nape, and black of head more extensive (cross- 

 ing anterior portion of forehead and entirely surrounding ej'e) ; 

 biU rather less stout ; wing 2.30-2.35, tail 2.50-2.G0 (or more, the 

 feathers being much worn at ends), exposed eulmen .45-.47, depth 

 of bill at base .20, tarsus .90-.02. JIab. Guatemala and British Hon- 

 duras to Costa Rica. 



G. caninucha RiDOW. Gray-naped Yellow-throat.' 



Genus ICTERIA Vieillot. (Page 482, pi. CXV., fig. 6.) 



Species. 



Common Characters. — Advlt males : Above plain olive-green or olive-grayish ; 

 throat, chest, and breast rich gamboge-j'ellow ; belU", anal region, and under tail- 

 coverts white ; ej-elids, supraloral streak, and malar stripe white ; lores deep black. 

 Adult female: Similar to the male, but colors duller, with black and white markings 

 less strongly contrasted. Young : Above plain dull olive or olive-grayish, the head 

 ■with the white and black or dusky markings of the adult but indistinctly indi- 

 cated ; malar region, chin, throat, chest, and breast grayish white (more tinged 

 with grajMsh on chest), the yellow soon appearing in patches. Nest in briery 

 thickets, composed exteriorly of dry leaves, thin strips of grape-vino bark, coarse 

 grasses, etc., lined with finer grasses. Eggs 3-5, pure white, or pinkish white, 

 spotted, speckled, or sprinkled with reddish brown, or rich madder-brown, and 

 lilac-graj'. 



a\ Above olive-green ; white malar stripe shorter; wings and tail shorter ; length 



' Ocolhhjptt polineephala Baird, Review, i. April, 1865, 225. 



» Now species. Type, No. 41743, U. S. Nat. Mus., cf ad., Mirndor, Mexico, Aug. 24 ; C. Sartorius. (= G. 

 poUoeephnla Sbarpe, Cat. B. Brit. Mus. x., pi. ix., fig. .f.) 



» Geothhipii pnUocephtrn, var. cnninurha Rinr.w. in Hist. N. Am. B. i. 1871, 290. Ocnihl;/p!a cmiiniicha 

 Salv. a Godm., Biol. Centr.-Am., Avea, i. 1881, 15.'!, pi. ix., fig. 2. 



Note. — It may be explained that these three nearly-related species (or possibly subspecies, since inter- 

 mediate specimens mat/ hereafter be found) are diagnosed above entirely from specimens in summer plumage, 

 thus showing that Mr. Sharpe's suggestion (page 359, vol. x.. Cat. B. Brit. Mus.) that tlioy may represent 

 seasonal dilTorcDCOs of plumage fails of rorification. 



