THE HUMMING BIRDS. 317 



f 2 . Exposed culmen less than half as long as wing. 



g l . 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 CampylopterusA 



f. Tail less than 2.25. 



h l . 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 bronze-black. 



1 1 . 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, bliie-black in middle portion Clilorostilbon.\ 



1 2 . Middle tail-feathers bronzy ; females and young males without 



grayish base or tip to outer tail-feathers Sporadimi8. 



/i 2 . Tail less than three-fourths as long as wing, variously shaped, but 

 never forked for more than one fourth its length; adult male s 

 never entirely green beneath. 

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



green ; sexes alike. 

 j 1 . Exposed culmen decidedly more than half as long as tail ; top of 



head usually metallic blue or violet..-. Uranomitra.\\ 



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

 never blue or violet Agyrlria.^ 



1 3 . Lower parts never pure white. 



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



a broad baud of blue-black Petasophora.** 



f. Tail not bright bluish green, etc. 



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

 end of nostrils and partly or entirely covering the scale over 

 the nostrils. 



* Doricha REICH., Aufz. der Colib. 1853. 12. Type, Trochilus enicurus VIEILL. (One 

 Mexican, one Guatemalan, one Costa Ricau, and two Babarnan species.) 



\Campyloptenis 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, being 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, aa having been seen by him the day before, near Fort Wingate, New 

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

 whirred like an old quail.") 



t Chlorostilbon GOULD, Mon. Troch, pt. v, 1853. Type, Trochilus pucherani BOURC. 

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

 America.) 



$ Sporadinus BONAP., Rev. et Mag. Zool. 1854, 255. Type, Trochilus riccordi GERV. 

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

 hamas.) 



|| Uranomitra REICH., Aufz. der Colib. 1853, 10. Type, Trochilusfranciw BOURC. and 

 MULS. (Four species in Mexico, one in Honduras, one in Colombia, and one in Peru.) 



1[ Agyrtria REICH., Troch. Enutn. 1855,7. Type, Trochilus brevirostris LESS. (Two 

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

 mostly green ; one 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.) 



