BIRDS OF NORTH AND MIDDLE AMERICA. 375 
Tache lawrencei Beruerscn, Ibis, 5th ser., v, July, 1887, 292 (Tres Marias Islands, 
w. Mexico; coll. Count von Berlepsch).—Ripaway, Man. N. Am. Birds, 
1887, 592; 2d ed., 1896, 613.—Bovcarp, Gen. Hum. Birds, 1894, 112.— 
Netson, North American Fauna, no. 14, 1899, 46 (Tres Marias; habits; 
crit.).—Barey (H. H.), Auk, xxiii, 1906, 389 (Cleofa Island, Tres Marias). 
Tache lawrencit Savin, Cat. Birds Brit. Mus., xvi, 1892, 61.—Satvin and Gop- 
MAN, Biol. Centr.-Am., Aves, ii, 1892, 258. 
I[ache] lawrencei Ripaway, Man. N. Am. Birds, 1887, 320; Rep. U. 8. Nat. 
Mus. for 1890 (1891), 373 (diagnosis, etc.). 
[Phaeoptila] lawrencet Sruon, Cat. Troch., 1897, 15. 
P{haeoptila] lawrence: Hartert, Das Tierreich, Troch., 1900, 64 mene ds 
[Phxoptila] lawrencei SHarry, Hand-list, ii, 1900, 110. 
CYNANTHUS DOUBLEDAYI (Bourcier). 
DOUBLEDAY’'S HUMMING BIRD. 
Much smaller than C. latirostris or C. lawrencei (wing not more 
than 51 mm.); adult male with pileum much more brilliant metallic 
green than back, under parts more extensively and decidedly blue, 
and under tail-coverts black (glossed with blue or green), with or 
without pale gray or grayish white margins; adult female with basal 
half of rectrices less distinctly bronze-greenish. 
Adult male.—Forehead and crown brilliant metallic bluish green, 
usually decidedly more bluish on forehead, sometimes wholly uni- 
form emerald green;* occiput and hindneck metallic grass-green 
(more bronzy in worn plumage); back, scapulars, wing-coverts, and 
rump bronze-green, usually duller (sometimes inclining to brownish 
gray) on rump; upper tail-coverts varying from dull bronze-green 
to dusky; tail glossy blue-black, the six middle rectrices tipped with 
deep brownish gray (more broadly on middle pair); remiges purplish 
dusky; chin and throat bright metallic blue or violet-blue, passing 
into less bright metallic bluish green on under parts of body, usually 
more decidedly bluish along median line, the sides of breast’ more 
bronzy green; femoral tufts and tuft on each side of rump white; 
under tail-coverts varying from uniform blue-black to dusky glossed 
with green or bluish and more or less margined or tipped with pale 
gray or grayish white; bill brownish (reddish in life) passing into 
dusky terminally; iris dark brown; feet dusky; length (skins), 75-92 
(84); wing, 46-51 (47.8); tail, 28-34 (30.7); middle rectrices 20-23 
(21.4); culmen, 16.5-19.5 (17.8). 
Adult female—Above metallic bronze-green, usually much duller 
(often dull grayish brown or brownish gray) on forehead and crown; 
@ This variation in color of the forehead and crown appears to be principally if not 
wholly due to difference in age of the plumage, all specimens examined in which the 
plumage is evidently old or considerably affected by wear or exposure having the 
forehead and crown uniform green, while those in fresh plumage have the forehead 
distinctly blue and the crown bluish green. 
b Twelve specimens, 
