THE HUMMING BIRDS. 873 



nitida would eventually prove to be merely a variation of 1. doubledayi, 

 and not a distinct species. 



The males of the several forms may be distinguished as follows, the 

 females of all except I. latirostris and L nitida being unknown to me: 



a 1 . Tail forked for only one-fourth its total length ; exposed culmeu more than .70. 

 b 1 . Upper pai'ts bronze-green ; bill larger and broader at base. 

 c 1 . Under tail- coverts white, with dull grajish central spaces, entirely white in 

 young; whole throat mefallic blue. Hah., Western and central Mexico, 

 north to southern Arizona. 



/. latirostris (Swains.). Circe Humming Bird (Pago 373). 

 c 2 . Under tail-coverts dusky grayish, glossed with green, margined with grayish 

 white ; throat metallic green, tinged with blue toward chin. Hab. Tres 

 Marias Islands, western Mexico. 



i". lawrencei Berl. Lawrence's Humming Bird * 

 b 1 . Upper parts purplish copper-bronze ; bill smaller and narrower (exposed cnlmen 

 less than 0.75, width at base not over 0.12). Hab., Western Mexico (vicinity 

 of Mazatlan). i". magiea (Muls. and Verr.). Magic Humming BirdA 



a 2 . Tail forked for much more than one-fourth its total length; exposed cnlmen less 

 than 0.70. 

 b l . Under parts, except throat, metallic bluish green ; top of head metallic emerald- 

 green, inclining to blue on forehead. Hab., Southwestern Mexico (Dos 

 Arroyos, Guerrero: "Chimantla")- 



/. doubledayi (Bourc. ). Doubleday's Humming Bird.t 

 b" 2 . Under parts metallic bine, the throat more purplish blue; top of head metallic 

 blue, more greenish posteriorly. Hab., Southwestern Mexico (Siena Madre 

 of Guerrero ; Chihuitan, Tehuantepec). 



/. nitida Salv. Shining Humming Bird.§ 



Circe Humming Bird. Iache latirostris (Swains.). 



(Plate xlv.) 



Cynanthus latirostris Swains., Philos. Mag., I, 1827, 441. 



Circe latirostris Gould, Mou. Troch., pt. xm, 1857, pi. 7 ; vol. V, 1861, pi. 338.— 

 Hensh., Am. Sportsm., v, Feb. 20, 1875, 328 (Chiricahua Mountains, Arizona); 

 Zool. Wheeler's Exp., 1875, 380. 

 Iache latirostris Elliot, Class, and Syuop. Troch., 1879, 235. 

 Circe (Gould). 

 Broad-billed Humming Bird. 

 La Circe" a large bee (Mulsant and Verreaux). 

 Chupamirto matraquita (D'Oca). 



Eange. — Western and central Mexico, north into southern Arizona. 



Sp. Char. — Adult male, metallic bronze-green above, much duller on 

 top of head, and on upper tail-coverts ; tail blue-black, the middle feathers 

 tipped with brownish gray; chin and throat bright metallic blue, rest 

 of under parts metallic green, the under tail-coverts white, with or with- 

 out grayish or greenish central spots ; bill reddish basally (brownish in 



* Iache lawrencei Berl., Ridgw., Man. N. Am. B., 1887, 320. 



t Hyloeharis magiea Muls, and Verr., Ann. Soc. Lyon, xviii, 1872, 110. — Iache magiea 

 Elliot, Class, and Syuop., Troch., 1879, 235. 



t Trochilus doubledayi Bourc, P. G. S., 1874, 46. — Iache doubledayi Elliot, Class. 

 and Synop. Troch., 1879, 235. 



§ Iache nitida Salv., Ibis, April, 1889, 240. 



