BIRDS OF NORTH AND MIDDLE AMERICA. 375 



lache lawrencei Berlepsch, Ibis, 5tli ser., v, July, 1887, 292 (Tres Marias Islands, 

 w. Mexico; coll. Count von Berlepsch). — Ridgway, Man. N. Am. Birds, 

 1887, 592; 2d ed., 1896, 613.— Boucard, Gen. Hum. Birds, 1894, 112.— 

 Nelson, North American Fauna, no. 14, 1899, 46 (Tres Marias; habits; 

 crit.).— Bailey (H. H.), Auk, xxiii, 1906, 389 (Cleofa Island, Tres Marias). 



lache laivrencii Salvin, Cat. Birds Brit. Mus., xvi, 1892, 61. — Salvin and God- 

 man, Biol. Centr.-Am., Aves, ii, 1892, 258. 



I[ache] lawrencei Ridgway, Man. N. Am. Birds, 1887, 320; Rep. U. S. Nat. 

 Mus. for 1890 (1891), 373 (diagnosis, etc.). 



[Phaeoptila] laurencei Simon, Cat. Troch., 1897, 15. 



I'[haeoptila] lawrencei Hartert, Das Tierreich, Troch., 1900, 04 (monogr.). 



[Phscopdla] lawrencei Sharpe, Hand-list, ii, 1900, 110. 



CYNANTHUS DOUBLEDAYI (Bourcier). 



DOUBLEDAY'S HUMMING BIRD. 



Much smaller than C. latirostris or G. lawrencei (wins; not more 

 than 51 mm.); adult male with pileum much more brilliant metallic 

 green than back, under parts more extensively antl 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 w^orn plumage) ; back, scapulars, wing-coverts, and 

 rump bronze-green, usually duller (sometimes inclining to brownish 

 gray) on rump; upper tail-coverts var3"ing from dull bronze-green 

 to dusky; tail glossy blue-black, the six middle rectrices tipped with 

 deep brownish gray (more broadh^ on middle pair) ; remiges jiurplish 

 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 

 bi'onzy 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 ])luisli and more or less margined or tipped with pale 

 gray or gi-ayish white; bill browjiish (reddisli in life) passing into 

 dusky terminally; iris dark brown; j'eet 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).^ 



AduU female. — Above metallic bronze-green, usually much duller 

 (often dull grajdsh brown or brownish gray) on forehead and crown; 



a 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. 



^ Twelve specimens. 



