THE HUMMING BIRDS. 317 



/*. Exposed culmen less than half as long as wing. 



(f. Tail 2.25 or more, rounded, feathers very broad the three outermost 

 broadly tipped with white in both sexes ; shafts of three outer quills 



very strong, often enormously thickened Campyloptcrus.i 



7 2 . Tail less than 2.25. 

 h [ . Tail more than three-fourths as long as wing; forked for more 

 than one-fourth its length, the feathers broad and rounded at 

 tips; adult males wholly bright green beneath, the tail blue- 

 black or brouze-black. 

 i l . Middle tail-feathers blue-black, like the rest (tipped with dull 

 grayish in the Mexican species) ; females and young males 

 with outer tail-feathers grayish white or pale grayish at tip 



and base, blue-black in middle portion Chlorostilhon.t 



i 2 . Middle tail-feathers bronzy; females and young males without 



grayish base or tip to outer tail-feathers Sporadint<8.§ 



h-. Tail less than three-fourths as loug as wing, variously shaped, but 



never forked for more than one fourth its length ; adult males 



never entirely green beneath. 



i 1 . Lower parts white, the sides sometimes green or spotted with 



green ; sexes alike. 



f. Exposed cnlmeu decidedly more than half as long as tail ; top of 



head usually metallic blue or violet UranomHra.\\ 



j 2 . Exposed culmcu not more than half as long as tail ; top of head 



never blue or violet Agyrtria.il 



i 2 . Lower parts never pure white. 

 j 1 . Tail bright bluish green or greenish blue, crossed near end by 



a broad baud of blue-black .Petasophora** 



j 2 . Tail not bright bluish green, etc. 



k l . Feathering of forehead extended forward as far as anterior 

 end of nostrils and partly or entirely covering the scale over 

 the nostrils. 



* Doricha Eeich., Aufz. der Colib. 1853 12. Type, Trochilus enicurus Vieill. (One 

 Mexican, one Guatemalan, oue Costa Rican, and two Babamau species.) 



\ Campylopterus Swains., Zool. Jour. 1826,328. Type, Trochilus largipennis Bodd. 

 (One Mexican species — a splendid bird -one peculiar to Guatemala, and several in 

 northern South America. The first, C. hemileucurus (Licht.), is the largest humming 

 bird found north of the Isthmus of Panama, beiug nearly 6 inches in length. It is 

 very possibly the species to which Dr. R. W. Shufeldt, U. S. A., refers in a letter dated 

 June 9, 1886, as having been seen by him the day before, near Fort Wiugate, New 

 Mexico, and which he described as beiug " fully large enough for Eugenes fulgens, and 

 whirred like an old quail.") 



i Chlorostilbon Gould, Mon. Troch, pt. v, 1853. Type, Trochilus pucherani Bouuc. 

 and Muls. (Three species in Mexico, one iu Porto Rico, and about six in South 

 America.) 



§ Sporadinus Bonap., Rev. et Mag. Zool. 1854, 255. Type, Trochilus riccordi Gerv. 

 (One species iu Haiti, one iu Cuba and Bahamas, and apparently one peculiar to Ba- 

 hamas.) 



|| Uranomitra Reich., Aufz. der Colib. 1853, 10. Type, Trochilus francice Bourc. and 

 Muls. (Four species in Mexico, oue in Honduras, one in Colombia, and one iu Peru.) 



If Agyrtria Rmcii., Troch. Euum. 1855,7. Typo, Trochilus brevirostris Less. (Two 

 Mexican and uumerous South American species ; some of the latter with lower parts 

 mostly green ; oue of the former, with buffy or rufous belly and flanks.) 



** Petasophora Gray, List Gen. B. 1840,13. Type, Trochilus serrirostris Vieill. 

 (One species in Mexico and Guatemala, several in Central and South America.) 



