652 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



very slightly shorter than middle toe, the hallux shorter than lateral 

 toes. Wing relatively small, less than twice as long as exposed cul- 

 men in adult males, about twice as long in females, the outermost 

 primary longest and distinctly narrowed and incurved terminally in 

 adult males. Tail about three-fourths as long as wing in adult males, 

 rather deeply forked but with outermost rectrix not longer than next 

 pair, all the longer rectrices narrow (the lateral ones acicular in one 

 species); in adult female tail less than two-thirds as long as wing, 

 rounded or double-rounded, all the rectrices normally broad. 



Coloration. — Above metallic bronze-green, greenish bronze, or 

 bronze, including middle rectrices; under parts mostly whitish 

 medially, greenish, bronzy, or buffy laterally. Adult males with 

 chin and throat brilliantly metallic reddish purple changing to violet 

 or even blue (the posterior-lateral feathers of the "gorget" much 

 elongated), the chest dull white, the lateral rectrices wholly blackish; 

 adult female with throat and chest buffy or whitish, and lateral rec- 

 trices cinnamon-rufous basally, then blackish, the two or three 

 outermost pairs tipped with white. 



Range. — Mountains of Mexico, including adjacent parts of Texas, 

 New Mexico, and Arizona. (Two species.) 



KEY TO THE SPECIES OF CALOTHORAX. 



a. Throat brilliant metallic purple; tail deeply forked, the lateral rectrices narrow, 

 pointed, wholly purplish black. {Adult males.) 

 b. Bill longer, the exposed culmen 20-22.5 (21.2), strongly decurved; outermost 

 rectrix very narrow, attenuate-acuminate or acicular terminally. CWTiole of 

 Mexico and adjacent portion of United States.) 



Calothorax lucifer, adult male (p. 652). 

 bb. Bill shorter, the exposed culmen 18.5-19 (18.7), very slightly if at all decurved; 

 outermost rectrix broader, rounded at tip. (Southern Mexico.) 



Calothorax pulcher, adult male (p. 655). 

 aa. Throat buff (more or less deep); tail double-rounded, the lateral rectrices broadly 

 tipped with white. {Adult females .) 

 b. Bill longer, exposed culmen 19.5-22 (averaging 21.1), decidedly decurved. 



Calothorax lucifer,o adult female (p. 653). 

 bb. Bill shorter (17-18.5, averaging 17.9), slightly if at all decurved. 



Calothorax pulcher," adult female (p. 655). 



CALOTHORAX LUCIFER (Swainson). 



LUCIFER HUMMING BIRD. 



Adult male. — ^Above metallic bronze, bronze-green, or golden 

 green, usually duller on pileum, especially on forehead; remiges dull 

 brownish slate or dusky, faintly glossed with purplish; four middle 

 rectrices metallic green or bronze-green, the rest of tail purplish or 



a I do not know of any other character which will serve to invariably distinguish 

 between the females of these two species. All the measurements inosculate, except 

 length of bill, but average decidedly less in C. pulcher than in C. lucifer except length 

 of tail, which is slightly greater. 



