492 BULL-ETTN 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 wliite 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.) 



CYANOL^MUS 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 

 wliite 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); 

 cliin and throat metallic blue (varying from a greenish to a slightly 

 violet hue), the feathers Yexj 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 wliite; femoral and 

 anal tufts and tuft on each side of rump wliite; bill dull black; iris 

 dark brown; feet dusky; length (skins), 116-136 (119); wing, 72-79 

 (76.7); tail, 43.5-50 (46.6); culmen, 21.5-25 (23.3).« 



" Twenty-three specimens. 



