592 BULLETIN 50, UNITED STATES NATIONAL MUSEUM, 



rectrices broadly rounded terminally (similar in form, and essentially 

 so in coloration, in the two sexes). 



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

 bronze, mcludmg middle rectrices; tail (except middle rectrices) 

 cinnamon-rufous or rufescent basally, black sub terminally, white or 

 whitish at tip, in both sexes; chest dull whitish. Adult male with 

 chin and throat brilliant metallic reddish purple, changing to violet 

 or blue; rufous of lateral rectrices occupying basal half or more. 

 Adult female with throat whitish, flecked with bronze or dusky; 

 sides, flanks, and under tail-coverts suffused with cinnamon buffy, 

 and rufous of lateral rectrices duller and involving less than basal half. 



Range. — Mexico (including adjacent parts of Arizona) to highlands 

 of Guatemala. (Three species or subspecies.) 



ATTHIS HELOISA HELOISA (Lesson and Delattre). 



HELOISE'S HUMMING BIRD. 



Adult male. — Above metallic bronze-green, greenish bronze, or 

 golden bronze (sometimes tinged with copper-bronze on back); 

 middle pair of rectrices metallic bronze-green or greenish bronze 

 (sometimes dusky at tip), both webs edged for basal half or more 

 with cinnamon-rufous; next pair of rectrices with basal half or more 

 cmnamon-rufous, the terminal portion black, this usually separated 

 from the cinnamon-rufous by a space of bronze-green or greenish 

 bronze; other rectrices with basal half or more cinnamon-rufous, the 

 subterminal portion (extensively) black (usually with more or less 

 of bronze-green or greenish bronze between the black and the cin- 

 namon-rufous portion), the tip (broadly) white; remiges brownish 

 slate color or dusky, very faintly glossed with violaceous; sides of 

 head brownish gray or grayish brown, passing into dull white on 

 anterior portion of malar region and on postocular region; chin and 

 throat brilliant metallic magenta purple, changing to bluish purple 

 and even, partly, to greenish blue, according to dill'erent inclinations 

 of the light, the more posterior feathers of the throat much elongated, 

 especially laterally; chest, sides of neck, breast (medially), abdomen, 

 and under tail-coverts dull white, or grayish white; sides and flanks 

 light cinnamon-rufous, overlaid, more or less extensively, by metallic 

 bronze or bronze-green; bill dull blackish; iris dark brown; feet dusky; 

 length (skins), 59-71 (68); wing, 32.5-38 (34.6); tail, 19-22.5 (20.7); 

 exposed culnien, 11.5-13 (12. 1).** 



Adult female. — Above similar to the adult male, but tail with rela- 

 tively much more black and less cinnamon-rufous, the latter also 

 duller, especially on lateral rectrices, the middle pair of rectrices 



a Nine specimens. 



