TROCHILIDJE — THE HUMMING-BIRDS. 439 



We have included Lamporjiif: in the list of United States genera on 

 exceedingly duubtl'ul evidence of the occurrence of L. inmigo, which was 

 said to have been taken at Key West, and sent to j\Ir. Audubon, who figured 

 it. The species, however, proves to be one belonging to Brazil, and not the 

 Jamaican form {L. porphyrura, Gould), whicii might possibly have straggled 

 there. 



In reference to the large number of species of Trochilidcv, it may be well 

 to remark that many differ by very slight, sometimes quite inappreciable 

 characters, and are to be looked on as only climatic or geograpliical varieties. 

 All those given for the United States are, however, well njarked. 



Additional species of Trochilidce will doubtless yet be detected within 

 our limits, especially in Arizona, New Mexico, and Southern Texas, where 

 almost any of the JMexicau table-land species may be looked for, such as 

 Calyptc floresi, Calothorax cyanopogon, etc. South Florida will probably yet 

 furni.sli to us the Bahaman Boricha cvchjna:. 



The following synopsis expresses, perhaps, a more natural arrangement of 

 the genera : — 



A. Nasal operculum entirely covered by the front.il feathers ; base of the bill 



narrow. 



a. Tail forked, and unvariegated in the male. Outer primary strongly 

 bowed, or curved inward at the end. 



Stellula. Tail deeply emarginated in <J, somewhat doubly rounded in 

 9 , but outer feather not longest ; the feathers spatulate ; outer primary 

 very strongly bowed, and very broad at end. ^. G-orget feathers 

 linear, much elongated ; only their terminal half colored; crown green 

 like the back. J. Similar in form, but the intermediate feathers of tail 

 longer than the e.Kternal, instead of shorter. 



Trochilus. Tail deeply emarginated in the male, the feathers attenu- 

 ated toward tips ; doubly rounded in 9 , and broader ; outer primary 

 strongly bowed, but narrow at end. ^. Gorget feathers broad, short, 

 squamate ; colored blue or crimson to their bases. Crown green like 

 the back. 



Calypte. Tail as in Trochilus,\>\ii the external feather abruptly nar- 

 rower than the next, with its edges nearly parallel. Outer primary as 

 in Trochilus. Crown metallic (violet or crimson) like the throat. 

 Female like that of Trochilus. 

 h. Tail rounded or graduated, and variegated in the male. Outer primary 

 only slightly bowed, and n.arrow at end, except in 9 of Atthis. 



Selasphorus. Tail graduated in the ^, the feathers attenuated at ends. 

 Outer primary abruptly attenuated, the end turned outwards. Gorget 

 feathers broad, elongated laterally, rose-purple or fire-color ; crown 

 green like the back ; tail-feathers edged with rufous. 9 with tail less 

 graduated, and the feathers broader at ends. Outer primary broader, 

 and not attenuated and turned outward at end. 



Atthis. Se.xes alike in form. Tail rounded ; outer primary bowed at 

 end, rather narrow in the ^. Gorget feathers much elongated, posteri- 

 orly and laterally ; tail-feathers tipped with white. 

 c. Tail rounded, or slightly emarginated, and usually unvariegated in either 



