Mr. J. Gould on new Species of Humming -Birds. 305 



Thaumatias cleruleiceps, Gould. 



Crown of the head and back of the neck deep shining greenish- 

 blue ; back and shoulders green, passing into bronzy-green on the 

 rump and upper tail-coverts ; tail nearly uniform bronze, with a very 

 faint indication of a zone of brown across the outer feathers near the 

 tip ; wings purplish brown ; sides of the neck glittering bluish-green, 

 the blue tint predominating on the ear and immediately under the 

 eye ; centre of the throat and chest broken glittering green and white ; 

 flanks bronzy-green ; under tail-coverts grey, with brown centres ; 

 upper mandible dark brown ; under mandible appears to have been 

 yellow, except at the tip, which is dark brown. 



Total length 3 \ inches ; bill -j-f ; wing 2\ ; tail \. 



Hab. Bogota. 



Remark. — This species, which is somewhat allied to the T. Milleri, 

 differs from that, as well as from every other known member of its 

 genus, by the blue colouring of its crown. 



Thaumatias nitidifrons, Gould. 



Crown of the head, face, chest, and breast glittering green ; abdo- 

 men and flanks golden green ; back, shoulders, and rump bronzy- 

 green ; tail pale bronzy greyish-green, with a zone of purplish-brown 

 crossing the four lateral feathers on each side near their tips ; under 

 tail-coverts grey, with a patch of bronzy-green in the centre of each ; 

 tarsi greyish-brown ; upper mandible black ; under mandible yellow, 

 black at the tip. 



Total length 3£ inches ; bill f ; wing If. 



Hab. Unknown. 



Remark. — Nearly allied to the T. brevirostris and T. Milleri, but 

 differing from both in the glittering green of the face and crown, and 

 in the centre of the breast being covered with the same shining 

 colour. The specimen described was presented to me by G. N. Law- 

 rence, Esq., when I visited New York in 1858. 



Chlorostilbon melanorhynchus, Gould. 



Bill black ; crown of the head and the entire under surface glit- 

 tering golden-green, the golden hue being most conspicuous on the 

 crown ; the back of the neck and upper surface are also golden-green, 

 but less brilliant; wings purplish-brown; the short and slightly 

 forked tail is greenish or steel-blue ; thighs brown ; anal region, and 

 a small tuft springing from each side of the body, white. 



Total length 3-| inches ; bill f ; wing 2 ; tail 1-J. 



Hab. The neighbourhood of Quito in Ecuador. 



Remark. — Differs from C. chrysog aster in its black bill, its shorter 

 and less forked tail, and in its being a stouter or more robust bird. 



Chlorostilbon acuticaudus, Gould. 



Crown and all the under surface glittering green, the green as- 

 suming a golden hue on the crown ; back, all the upper surface, and 

 tail rich golden-green ; wings purplish-brown ; bill black. 



Total length 3 inches ; bill f ; wing If ; tail 1. 



Hab. Antioqua in Columbia. 



