492 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
the latter extending nearly as far as its anterior end, forming a very 
short point or antia on each side of culmen. Tarsus clothed, except 
behind, with short feathers; lateral toes about equal in length, 
slightly shorter than middle toe, the hallux about as long as lateral 
toes. Wing more than three times as long as exposed culmen in 
adult male, less than three times as long in adult female, the outer- 
most primary longest. Tail about three-fifths as long as wing, 
slightly emarginate in adult male, slightly double-rounded (with 
lateral rectrices shorter than middle pair) in adult female. 
Coloration.—Above rather dull bronze-green or greenish bronze, 
duller (grayish brown) on pileum, the tail dull bluish black, with 
lateral rectrices broadly tipped with white; a white postocular 
streak and whitish rictal streak, inclosing a dusky auricular space; 
under parts gray, the adult male with feathers of throat tipped with 
metallic blue. 
Range.—Southwestern United States, near Mexican border, to 
Guatemala. (Monotypic.) 
CYANOLZAMUS CLEMENCI£ (Lesson). 
BLUE-THROATED HUMMING BIRD. 
Adult male.—Above rather dull metallic bronze-green, passing into 
olive-bronze or bronzy olive on rump, where the feathers have narrow 
terminal margins of pale brownish gray or buffy grayish; upper tail- 
coverts dusky (sometimes faintly glossed with greenish or bluish), 
narrowly and indistinctly margined with paler; tail black, faintly 
glossed with bluish, the outermost rectrix with terminal third (or less) 
abruptly white, the second less extensively tipped with white, the 
third usually with a small median white streak or mark (usually more 
or less fusiform or diamond-shaped) near tip; remiges dark brownish 
slate color or dusky, very faintly glossed with purplish; a conspicuous 
white postocular streak, extending obliquely backward and down- 
ward behind upper posterior margin of auricular region, the latter, 
together with the suborbital and loral regions, plain dusky; a more 
or less distinct rictal streak of whitish (this sometimes obsolete); 
chin and throat metallic blue (varying from a greenish to a slightly 
violet hue), the feathers very narrowly and indistinctly margined 
with brownish gray and with concealed portion of the latter color; 
rest of under parts plain deep brownish gray or brownish slate color, 
the under tail-coverts broadly margined with white; femoral and 
anal tufts and tuft on each side of rump white; bill dull black; iris 
dark brown; feet dusky; length (skins), 116-136 (119); wing, 72-79 
(76.7); tail, 48.5-50 (46.6); calmén, 21.5-25 (23.3).¢ 
a Twenty-three specimens. 
