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, including middle rectrices; tail (except middle rectrices) 
cinnamon-rufous or rufescent basally, black subterminally, 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 
cinnamon-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 different 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 cimnamon-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 culmen, 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 
@ Nine specimens, 
