iy4 Genera of Humming Birds. 



bronze. Lateral, white, with a slight blackish subterminal 

 bar near the tips. Underside white with a grayish tint, and 

 green feathers on sides of throat, neck, breast, abdomen, and 

 flanks. Rest like the male. 



Total length, 3|in. Wing, i|. Tail, if. Culmen, y\. 



This beautiful and rare species was discovered in Costa 

 Rica, by M. Carmiol. The type is in the National Museum 

 of Washington. 



I found this species at Naranjo, Costa Rica, on the Atlantic 

 slope. 



It is very rare. 



I have made a new genus with this remarkable species, 

 which I dedicate to Mr. Lawrence, the celebrated American 

 Ornithologist. 



Genus LXX\'. Polytmus, Brisson., Ornith., 1760. 

 Thaumatias, Bon., Compt. Rend., 1850, p. 382. 

 Chrysobronchiis, Bon., Rev. and Mag. Zool., 1854, p. 252. 

 Type : T. flianmnntias, Linne. 



Bill much longer than the head, slightly curved, wide at 

 base, and graduating to a point. Nostrils exposed. Wings 

 'long, reaching nearly the end of the tail. Rectrices narrow, 

 of unequal length, rounded at tip. 



Habitat. — Trinidad, Venezuela, Guiana, Columbia and 

 Brazil. 



250. Polytmus thaumantias, Linne, Syst. Nat., 1766, vol. i., 



p. 489. 



Trochilus virescens, Dumont, Diet., Sc. Nat., 18 18, p. 49. 

 Ornismya viridis, Less., Ois. Mou., 1829, p. 178. 

 Leucippns clirysobronclius, Reich., Aufz. der Col., 1853, 

 p. II. 



Thaumantias linnei, Bon., Rev. and Mag. Zool, 1854, 



P- 255- 



Chrysobronchiis virescens, Bon., Rev. and Mag. Zool., 

 1854, p. 252. 



Golden-throated Humming-bird, Gould, Mon. Troch., 

 vol. iv.. p. 230. 



