New World Warblers (Parulidae)

Black-throated Blue Warbler (Dendroica caerulescens) - HBW 15, p. 747

French: Paruline bleue German: Blaurücken-Waldsänger Spanish: Reinita Azulada

Taxonomy: Motacilla caerulescens J. F. Gmelin, 1789, Santo Domingo, Dominican Republic.
One record of hybridization, probably with D. petechia. Validity of race cairnsi has been questioned, both by earlier ornithologists and by more recent ones, on the basis that, in males at least, differences from nominate are not constant (cairnsi-type males occur in nominate population, and vice versa); further research required. Two subspecies tentatively recognized.

Subspecies and Distribution:

  • caerulescens ( J. F. Gmelin, 1789) - breeds in S Canada from Saskatchewan (irregular) and S Ontario E to Nova Scotia and in NE USA from Minnesota E to New England; migrates to Caribbean (mainly Bahamas and Greater Antilles), small numbers to E Middle America.
  • cairnsi Coues, 1897 - breeds E USA in Appalachians from SW Pennsylvania S to N Georgia; migrates to Caribbean, some to E Middle America.