IACHE. 319 
wing 2.00-2.30, tail 1.30-1.50, exposed culmen .65-.68. Hab. Highlands of 
Guatemala and Mexico, north to southern Arizona. 
440.1. B. leucotis (ViEILL.). White-eared Hummingbird.’ 
Genus IACHE Ettior. (Page 308, pl. XC., fig. 5.) 
Species. 
Common Cuaracters.—Adult males metallic grass-green above, the tail-feathers 
blackish, with dull gray tips (broadest on middle feathers); downy thigh-tufts pure 
white; under tail-coverts whitish or light grayish, mixed with darker; rest of 
lower parts metallic green, bluish green, or blue; bill pale brownish (red in life) on 
basal portion, blackish at end. Adult females metallic grass-green above, pale gray- 
ish beneath, the two exterior tail-feathers tipped with pale brownish gray, and all 
with the basal half green. 
a. Under tail-coverts in adult males white or grayish, with or without darker 
centres. 
b'. Under tail-coverts whitish on margins, darker in centre ; upper tail-coverts 
blue or green. 
c. Under tail-coverts white with dull gray centres in adult male, entirely 
white in young. Adult male: Upper parts grass-green, sometimes in- 
clining to bronzy green; chin and throat rich metallic blue, passing 
gradually into rich green on breast and belly; length about 3.50- 
3.75, wing 2.00-2.20, tail 1.35-1.50 (forked for .25-.35), culmen .75-.85. 
Adult female: Above grass-green, becoming dull gray on forehead ; 
lower parts uniform pale ash-gray; basal half of tail, with whole 
extent of its middle feathers, green, the two outer feathers tipped 
with dull gray; a whitish streak behind eye, with a dusky space 
immediately beneath it and extending beneath eye; length 3.88- 
4.10, wing 2.00-2.15, tail 1.25-1.30 (forked for about .15), culmen 
.78-.85. Young male: Similar to adult female, but tail as in adult 
male; lower tail-coverts uniform white; feathers of upper parts 
margined with pale buff; new feathers appearing on throat bluish 
green (instead of blue, as in adult), becoming more bluish toward 
chin. Young female: Similar to adult, but feathers of upper parts 
bordered with pale buff. Hab. Western Mexico, south to Colima, 
north to southern Arizona. 
441. I. latirostris (Swarns.). Broad-billed Hummingbird. 
c. Under tail-coverts entirely white in adult (?) male. Adult (?) male: 
Upper parts “reddish bronze”; throat and upper parts of breast 
metallic bluish green; under parts bronzy green with a coppery 
1 Trochilus leucotie ViEILL., Nouv. Dict. ed. 2, xxiii. 1818, 428. Bastlinna leucotie Rutcn., Aufz. der Colib. 
1853, 13. 
