628 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
spicuoisly, smaller than the rest, with a more or less prominent angle 
on edge of inner web near tip. Tail of adult males about three-fifths 
to two-thirds as long as wing, slightly forked or deeply emarginate 
(but with outermost rectrix shorter than the next pair), the middle 
rectrices very broad, with rounded tip, the others gradually decreas- 
ing in width to the lateral pair, all contracted or narrowed terminally 
and obtusely pointed; in adult females less than three-fifths as long 
as wing, double-rounded, the lateral rectrices subcuneate terminally, 
the outer pair not distinctly incurved. 
Coloration.—Above metallic bronze-green, including middle rec- 
trices, the pileum duller or darker; beneath mostly dull whitish or 
grayish. Adult males with chin (sometimes upper throat also) 
opaque black, the throat (at least lower portion) bright metallic red 
or violet, the lateral rectrices wholly purplish black; adult females 
with chin and throat whitish (sometimes flecked or streaked with 
dusky), and lateral rectrices tipped with white (the outer pair some- 
times wholly white), black subterminally, grayish or bronze-greenish 
basally. 
Range.—Temperate and subtropical North America; one species 
migratory in winter as far as western Panamé. (Two species.) 
KEY TO THE SPECIES OF ARCHILOCHUS. 
a. Throat (at least partly) bright metallic red or violet, the chin (sometimes upper 
throat also) velvety black; tail forked, the lateral rectrices wholly purplish 
black. (Adult males.) 
b. Throat bright metallic red. (Eastern North America; south in winter over 
nearly whole of Mexico and Central America to western Panamé, and to Cuba.) 
Archilochus colubris, adult male (p. 629). 
bb. Throat purple or violet. 
c. Lower half of throat violet to violet-blue; tail shorter, the lateral rectrices 
23.5-28 (25.6), middle rectrices 20.5-23.5 (21.9). Southern British Columbia 
to northern and western Mexico.) 
Archilochus alexandri, adult male (p. 633). 
cc. Greater part of throat magenta purple; tail longer, the lateral rectrices 30, 
middle rectrices 23. (Santa Barbara, California.) 
Archilochus violajugulum,2 adult male (p. 636). 
aa. Throat and chin dull white (sometimes flecked with dusky); tail double-rounded, 
the lateral rectrices broadly tipped with white and with a basal area of gray 
or greenish. (Adult females.) 
b. Smaller; wing 43.5-45.5 (44.5), tail 25-26.5 (25.6), exposed culmen 17-18.5 
(18.2); under parts more whitish. .Archilochus colubris, adult female (p. 629). 
bb. Larger; wing 46-48.5 (47), tail 26-27.5 (26.8), exposed culmen 24-26 (24.8); 
under parts more grayish...... Archilochus alexandri, adult female (p. 638). 
@ Probably a hybrid of Archilochus alexandri and Calypte anna. 
