I AC HE. 319 



\xm^ 2.00-2.30, tail 1.30-1.50, exposed culmen .G5-.68. Ilah. Ilii^hlaiuis of 

 Guatemala and Mexico, north to southern Arizona. 



440.1. B. leucotis (Vieill.). White-eared Hummingbird.' 



Genus I ACHE Elliot. (Page 308, pi. XC, fig. 5.) 



Species. 



Common Characters. — 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 gi-ecn, 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. 

 6'. 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 bellj' ; 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 graj- ; 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 (fbrked for about .15), culmen 

 .78-85. Youny male: Similar to adult female, but tail as in adult 

 male ; lower tail-coverts uniform white ; feathers of upper parts 

 margined with pale buflf; 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. Ifab. Western Mexico, south to Colima, 

 north to southern Arizona. 



441. I. latirostris (Swains.). 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 



' Trochilut leucotit ViEILL., Noav. Diet. cd. 2, xxiii. 1818, 428. Basilinna hucolia Reicb., Aufi. dor Colib. 

 1853, 13. 



