338 REPORT OF NATIONAL MUSEUM, 1890. 



gray; outer pair similar but with basal portion wholly pale brownish 

 gray, and the white tip slightly longer (extending about ,20 of an inch 

 from tip). A small white spot behind eye; beneath this an oblique 

 patch of brownish gray, extending from lower eyelid across ear-coverts 

 and gradually fading into the white of the throat; chin, throat, breast 

 belly, and under tail-coverts dull white; feathers of sides and flanks 

 pale bronze-green, broadly margined with pale buffy grayish or brown 

 ish white. Bill and feet black. Length (skin) 3, wing 1.80, tail 0,9'5 

 (outer feathers 0.10 shorter), exposed culmeu 0.65. 



Younff male(Ro. 993G9, Santa Kita Mountains, Arizona; J4.W. Nelson) , 

 Much like the adult female, as described. above, but top of head dull, 

 faintly metallic, bronze-green, like back, etc., and all the feathers of 

 upper surface of head and body distinctly margined terminally with 

 pale grayish buff, this most conspicuous on rump; rectrices with both 

 the white tips and black subterminal spaces less extensive, and basal 

 portion of outer feathers faintly glossed with green ; oblique patch from 

 beneath eye and across ear-coverts much darker; posterior part of sides 

 of throat spotted with dusky grayish brown, the more anterior portion 

 and chin marked with much smaller and paler spots; middle of throat 

 metallic violet. 



Young female (No. 117281, Final County, Arizona, May 27, 1885; W. 

 E. D. Scott) : Like the young male, as described, but entire throat, with 

 chin, immaculate white, shading into pale brownish gray on sides of 

 neck ; forehead and crown pale brownish gray, the feathers with small 

 central spots of darker; tail much as in adult female. 



Adult males vary somewhat in the changeable reflections of the crown 

 and ruff, which usually varies from a pure magenta or aster purple, 

 through violet, to light steel blue, with occasional greenish tints, accord- 

 ing to the position in which the bird is held, some specimens showing 

 the blue and green reflections more strongly than others. In one exam- 

 ple, a "mummied" skin from San Quentiu Bay, Lower California (No. 

 96615, May 9, 1880, L. Belding), a portion of the crown and the tips of 

 some of the ruff feathers are permanently or unchangeably bright green ; 

 but possibly this maybe the result of contact with thecarbolicacid with 

 which the specimen was preserved. There is also a good deal of varia- 

 tion in the distinctness of the markings on the under tail-coverts, some 

 specimens having the central portions of these feathers very faint gray- 

 ish, others very deep bronze or bronze green. 



Some adult females show metallic violet, bluish, or bluish green feath- 

 ers on the middle of the throat, but usually these are altogether absent. 



This beautiful Humming Bird, named by M. Bourcier in honor of M. 

 le Marquis Costa de Beauregard, is also an inhabitant of California, but 

 unlike C. anna is of very limited distribution in that State. According 

 to Dr. Cooper it has been taken as far north as San Francisco, but it is 

 probably only a straggler there, and it is said to be very rare in Ven- 

 tura County. It is common during summer in the canons of the San 



