A FIELD KF.Y TO THE SPRING MALES. 



I. Throat retl, orange or chestnut. 



II. Throat black or dark .slate-color. 



III. Throat yellow, white or whitish ; uiider-parts without streaks or spots. 



W. Throat white or whitish ; under-parts streaked or spotted. 



\'. Throat yellow ; under-i)arts .streaked or spotted. 



I. Throat Red, Orang-e or Chestnut. 



1. Throat chestnut. 



a. Top of head che.stnut ; sides of head black. Bay-brea.sted Warbler. 



b. Whole head rich chestnut. ( Extreme .south-west). 



Mangrove Warbler. 



2. Whole throat, chest and head orange-rufous. ( Extreme 



south-west ) . Olive Warbler. 



3. Throat orange or flame-color ; crown yellow. Blackburnian Warbler. 



4. Throat red. 



a. Crown and ear-coverts black. 1 Extreme .south-west). 



Red-faced Warbler. 



b. Ear-coverts silvery-white. (Extreme south-west). Red Warbler. 



II. Throat Black or Dark Slate-Color. 



A. Belly white. 



1. Back blue-gray; side of head black and white. (\\'estern). 



Black-throated Gray Warbler. 



2. Back deep blue ; a white spot in wing. Black-throated Blue Warbler. 



3. Back black ; a white spot in wing. ( Alleghanies). Cairns' W'arbler. 



4. Back black ; sides of head yellow and black. 



Golden-cheeked Warbler. 



5. Back gray and black ; top antl sides of head yellow. 



(Western). Hermit Warbler. 



(5. Back green ; cheeks and forehead yellow. 



Black-throated Green Warbler. 

 7. Back olive-green ; line over eye and breast, yellow. 



( We-stern 1. Townsend's Warbler. 



•S. Back grayish ; a large 3'ellow patch in wing. 



Golden-winged Warbler. 

 9. Back black ; patches of flame-color in wing, on sides of 



breast and in middle of tail. Rerlstart. 



