526 NORTH AMERICAN BIRDS. 



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

 Mexico (Mazatlan, etc.). 



G. poliocephala Baird. Mazatlan Yellow-throat.^ 

 c^. Bill larger and stouter ; belly and anal region yellow, the sides and 

 flanks light olive-grayish ; adult male with top 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 culmen .45-48, 

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

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



G. palpebralis Kidqw. Mirador Yellow-throat.* 

 h"^. Eyelids entirely black in adult male (brownish or olive in female and 

 young). 



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

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

 ing anterior portion of forehead and entirely surrounding eye) ; 

 bill rather less stout ; wing 2.30-2.35, tail 2.50-2.60 (or more, the 

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

 of bill at base .20, tarsus .90-92. Hah. Guatemala and British Hon- 

 duras to Costa Eica. 



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



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



Species. 



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

 throat, chest, and breast rich gamboge-yellow ; belly, anal region, and under tail- 

 coverts white ; eyelids, 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 grayish on chest), the yellow soon appearing in patches. Nest in briery 

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

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

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

 lilac-gray. 



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



^ Geothlypis poliocejiTiala Baird, Review, i. April, 1865, 225. 



'^ New species. Type, No. 44743, U. S. Nat. Mus., d ad., Mirador, Mexico, Aug. 24 ; C. Sartorius. (= G. 

 poliocephala Sharpe, Cat. B. Brit. Mus. x., pi. ix., fig. 3.) 



' Geothlypis jyoliocephala, var. caninucha Ridgw. in Hist. N. Am. B. i. 1874, 296. Geothlypia caninucha 

 Salv. & GoDM., Biol. Centr.-Am., Aves, i. 1881, 153, pi. ix., fig. 2. 



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

 mediate specimens may 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 they may represent 

 seasonal differences of plumage fails of verification. 



