Genera of Humming Birds. 237 



Aglaiactis caumatonota, Cab. and Heine., Mus. Hein, i860, 

 t. iii., p. 70. 



Black-throated Sun-beam^ Gould, Mon. Troch. Suppl., 

 1886, p. 67. 



r Aglaeacte a dos bronze, Muls., Hist. Nat. Ois. Mou., 

 1876, t. iii., p. 26. 



Habitat. — Peru. 



Male. — Top of head, back, cheeks, and throat brownish- 

 black. Loral space and spot behind the eyes rufous. Lower 

 part of back and rump, when viewed from behind, dark 

 crimson, shading into green on the uppertail coverts. Upper 

 part of breast, and sides of neck deep buff. Tuft of buff 

 feathers on the breast. Lower part of breast and flanks dark 

 bronzy-green, almost black. Abdomen arui undertail-coverts 

 reddish-buff. Greater wing-coverts olive-green, primaries 

 and secondaries purplish-brown. Shaft of outer primaries 

 rufous for three-fourths of its length. Base of central rectrices 

 bright rufous, remaining portion dark olive-green, the lateral 

 feathers have two-thirds of the basal portion of inner webs 

 rufous, the rest is dark olive-green. Bill and feet black. 



Total length, 4fin. Wings, 3I. Tail, 2\. Culmen, \^. 



Female. — Lighter coloured than the male. Head, back, 

 throat, and breast pale brown. Lower part of back less 

 brilliant, rest of plumage like the male. 



This rare species is one of my desiderata. 



337. AglaeactiS CASTELNAUDI, Bourc. and Muls., Rev. 



Zool., 1848, p. 270. 



Trochilus castelnaudi, Gray, Gen. Birds, 1849, vol. iii., 

 app., p. 30. 



Helianthea castelnaudi, Reich., Troch., Enum., 1855, p. 6. 



Aglaeactis castelnaudi, Cab. and Heine., Mus. Hein., 18*60, 

 t. iii., p. 69. 



Castelnau's Sun-beam, Gould, Mon. Troch., vol. iii., p. 180. 



r Agleacte de Castelnau, Muls., Hist. Nat. Ois. Mou., 1876, 

 t. iii., p. 22. 



Habitat. — Peru. 



Male. — Upperside dark bronzy -brown. Lower part of 

 back and rump, vfewed from behind, luminous metallic 



