FAMILY PARULIDAE 



245 



35. Throat black or gray 36 



Throat brown. 



male Bay-breasted Warbler, Dendroica castanea in alternate plumage, p. 280 



36. Crown green or yellow 37 



Upper surface blue. 



male Black-throated Blue Warbler, Dendroica caerulescens. p. 271 

 37. Wing coverts tipped bright yellow. 



Golden-winged Warbler, Vermivora chrysoptera. p. 250 

 Wing coverts tipped white. 



adult male Black-throated Green Warbler, Dendroica virens. p. 275 



38. Crown boldly streaked 39 



Crown with fine streaks or unstreaked 43 



39. Crown streaks black with brown, buff, or green 40 



Crown streaks black and white. 



Blalk-and- white Warbler, Mniotilta varia. p. 246 



40. Undersurface unstreaked 41 



Undersurface white with dark streaks on breast and flanks. 



Ovenbird, Seiurus aurocapillus. p. 284 



41. Central crown stripe buff or greenish 42 



Central crown stripe reddish brown. 



Black-cheeked Warbler, Basileuterus melanogenys. p. 318 

 42. Undersurface buff and white. 



Worm-eating Warbler, Helmitheros vermivorus. p. 249 

 Undersurface greenish and yellow. 



Three-striped Warbler, Basileuterus tristriatus. p. 313 



43. Upper surface unstreaked 44 



Upper surface with fine streaks 51 



44. Yellow or yellow-green rump contrasting with rest of upper surface 45 



No contrasting rump 46 



45. Rest of upper surface brownish, throat white. 



female or immature Yellow-rumped Warbler, 



Dendroica coronata coronata. p. 271 

 Rest of upper surface greenish, throat finely streaked, 

 female or basic plumage male Cape May Warbler, Dendroica tigrina. p. 271 



46. Undersurface heavily streaked 47 



Undersurface with little or no streaking 48 



47. Superciliary pure white, undersurface whitish, culmen of male 

 14.4-16.9 (15.5), of female 14.2-16.4 (15.5) mm. 



Louisiana Waterthrush, Seiurus motacilla. p. 288 

 Superciliary buffy or dull white, undersurface usually tinged pale yellow, 

 culmen of male 12.0-14.1 (13.2), of female 12.0-13.9 (13.1) mm. 



Northern Waterthrush, Seiurus noveboracensis. p. 286 



48. Wing coverts prominently tipped white 49 



Wing coverts not tipped white 50 



49. Upper surface yellowish green. 



female or immature Black-throated Green Warbler, Dendroica virens. p. 275 



50. Base of primaries white. 



female Black-throated Blue Warbler, Dendroica caerulescens. p. 271 

 Base of primaries unmarked. 



Tennessee Warbler, Vermivora peregrina. p. 252 



