66o Field Museum of Natural History — Zoology, Vol. IX. 



Kirtland's Warbler. 



space below the eye, black; a narrow line of black across forehead 

 bordering base of upper mandible; auricular region, slaty gray, an 

 imperfect whitish orbital ring, broken in front; back, grayish bufE, 

 streaked with black; upper tail coverts, slaty gray; under parts, 

 pale yellow, usually with small black spots on the breast; sides of 

 body, grayish, streaked with black. (Some male specimens from the 

 Bahama Islands, taken in March, have the breast practically im- 

 maculate.) Two outer tail feathers marked with a patch of white 

 on terminal portion of inner webs, the white patch much larger on the 

 outer feather than on the second ; under tail coverts, whitish; greater 

 wing coverts, brownish black, narrowly edged with grayish white 

 or whitish. 



Adult female in spring: Similar to the male, but back tinged with 

 brownish and the under parts slightly paler yellow, the breast more 

 extensively spotted. 



Immature birds in fall and winter resemble the female, but have 

 the crown, like the back, without gray, and the whole breast thickly 

 spotted with blackish. 



The yellow under parts, streaked with black on the sides and 

 usuall3/ spotted on the breast, combined with the black streaked 

 back and grayish rump, will usually distinguish this species. 



Length, 5.45; wing, 2.70; tail, 2.35; bill, .38. 



Three specimens of this rare warbler have been taken in Illinois 

 and one recorded from Wisconsin. The records are as follows: 



