BIRDS — SY1 VICOLIDAE DENDROICA CANADENSIS. 
271 
DENDKOICA CANADENSIS, Baird. 
Black-throated Blue Warbler. 
Motacilla canadensis, Linnaeus, Syst. Nat. I, 1766, 336.— Gmelin, I, 1788, 991. 
Sylvix canadensis, Latham, Index Orn. II, 1790, 539.— Wilson, Am. Orn. II, 1810, 115 ; pi. xv, f. 7.— Bonap. Obs. 
1826, No. 145.— Nutt. Man. I, 1832, 398.— Audubon, Orn. Biog II, 1834, 309 ; pi. cxlviii,clv 
Sylvicola canadensis, "Swainson," Jard. Ed. Wilson, 1832— Rich, List, 1837.— Bon. List, 1838.— Ib. Consp. 1850, 
308.— Aud. Syn. 1839, 61.— Ib. Birds Am. II, 1841, 63 ; pi. xcv. 
Rhimamphus canadensis, Cab. Journ. Orn. Ill, 1855, 473. 
Motacilla caerulescens, Gmelin, Syst. Nat. I, 1788, 960. 
Sylvia cmrulescens, Latham, Index Orn. II, 1790, 520.— Vieillot, Ois. Am. Sept. II, 1807, 25 ; pi. lxxx. 
Sylvia pusilla, Wilson, Am. Orn. V, 1812, 100 ; pi xliii, f. 4, (young.) 
Sylvia leucoptera, "Wilson, Index and 2d ed. (Hall's ed.) II, 390. 
Sylvia palustris, Stephens, Shaw Zool. X, ii, 1817, 722. 
" Sylvia mucropus, Vieillot," Gray. 
Sylvia sphagnosa, Bonap. Obs. Wils. 1826, No. 164, (female.)— Nuttall, Man. I, 1832, 406.— Aud. Orn. Biog. II, 
1834, 279. 
Sylvicola pannosa, Gosse, Birds Jam. 1847, 162, (female.) 
Sp. Oh. — Above uniform continuous grayish blue, including the outer edges of the quill and tail feathers. A narrow frontal 
line, the entire sides of head and neck, chin and throat, lustrous black ; this color extending in a broad lateral stripe to the tail. 
Rest of under parts, including the axillary region, white. Wings and tail black above, the former with a conspicuous white 
patch formed by the bases of all the primaries, (except the first ;) the inner webs of the secondaries and tertials with similar 
patches towards the base and along the inner margin. All the tail feathers, except the innermost, with a white patch on the 
inner web near the end. Length, 5.50 ; wing, 2.60 ; tail, 2.25. 
Female, olive green above and dull yellow beneath. Sides of head dusky olive, .the eyelids and a superciliary stripe 
whitish. Traces of the white spot at the base of the primaries and of the tail. 
Hab. — Eastern United States to the Missouri, south to the West Indies. 
The male and female of this beautiful species are very dissimilar, though the species may 
always be recognized by the white patch at the base of the primaries, wbich I do not think 
exists in any other Dendroica. The extent of this patch, however, in both mule and female, 
varies considerably. The colors of the female are strikingly similar to those of the female 
Spiza ciris, or Nonpareil. 
The autumnal or young male has the back clouded with greenish olive, and the black feathers 
of the throat much margined with whitish. There is also a white line over the eye, as in the 
female. 
A skin (10102) from Washington, in high spring plumage, has the feathers in the middle of 
the back bluish black, margined with blue, giving rise to conspicuous spots. 
List of specimens. 
Catal. 
No. 
Sex. 
Locality. 
When collected. 
Whence obtained. 
Length. 
Stretch 
of wings. 
Wing. 
2577 
788 
2305 
2429 
8645 
8646 
7307 
3795 
S 
$ 
9 
May 5, 1846 
S. F. Baird 
5.41 
4.83 
5. 16 
5.00 
4. 75 
5. 00 
8.00 
7.83 
7.83 
7. 66 
7. 75 
7. 00 
2.58 
2. 58 
2.41 
2.41 
2. 50 
2.50 
do 
Oct. 12, 1842 
do 
do 
Oct. 10, 1842 
do 
do 
3 
J. P. Kirtland 
Dr. Hoy 
3 
August 31 
